Lee Sedol - Gu Li , MLily Gu vs Lee Jubango . 2014-09-28

(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Chinese]SZ[19]KM[7.50]TM[14100]OT[5x60 byo-yomi]GN[Gu-Li-vs-Lee-Sedol-20140928]PW[Lee Sedol]PB[Gu Li]WR[9d]BR[9d]DT[2014-09-28]EV[MLily Gu vs Lee Jubango]RO[Game 8]PC[Chongqing, China]SO[https://gogameguru.com/]AN[An Younggil 8p]C[This is the eighth and final game of the MLily Gu vs Lee Jubango.This game was played on September 28, 2014, in Chongqing, China - which is Gu Li's hometown.The score going into this game was 5-2 in Lee Sedol’s favor which meant that this game was a kadoban for Gu and might be the last of the match.In game 7, Gu had a nice opening, and Gu managed the game very smoothly until the middle game. However, Gu played a careless move, and Lee reversed the game with a sudden attack.After Gu lost game 7, the atmosphere of the match changed, and a lot of Chinese journalists and Go fans lost interest in the Jubango. That's because even if Gu won all three of the remaining games, the best result he could achieve was a tie.Anyway, let's have a look at game 8 of the MLily Gu vs Lee Jubango.]RE[W+2.50];B[pd];W[dp];B[pq];W[dd];B[pk]LB[dd:4][pd:1][pk:5][qk:A][dp:2][pq:3]C[The high Chinese opening of Black 1, 3 and 5 is rarely seen in top pros' games these days. That's because this formation is less flexible than the low Chinese formation, where Black 5 is at A.](;W[fq]LB[jp:B][fq:6][gq:C][jq:A]C[Lee Sedol played the knight's enclosure at White 6, which happens to be one of Gu Li's favorite moves. This enclosure has become a popular response to Chinese style openings, in part because Gu played this move very often and had good results with it.Many other moves are also possible (White can play A-C for example), but this enclosure is more modern.];B[fc](;W[df]LB[fc:7][cf:A][df:8]C[Responding at A is more common, but Lee chose the high enclosure of White 8. This move is more active and will provide more support for attacking Black 7 later.];B[jc];W[qf](;B[qe]LB[db:A][jc:9][jd:B][qe:11][qf:10][pk:C]C[The three space extension at Black 9 was unusual. This move was one of Kobayashi Koichi 9p's favorites when he was #1 in Japan, but it's rarely seen these days. A and B are much more common.Kicking at Black 11 was normal, because Black C will limit White's development on the right side. This makes White slightly over-concentrated as you'll see in the actual game.];W[pf];B[nd];W[qi](;B[rj]LB[nd:13][qe:11][pf:12][qi:14][rj:15]C[The footsweep at Black 15 was the right move. Black 11 through to Black 15 is a textbook attacking combination when White enters Black's high Chinese formation in the top right.](;W[nh]LB[nh:16]TR[rj][pk][pq]C[The large knight's move at White 16 was light and flexible, because it didn't help Black to consolidate his moyo in the bottom right.](;B[ch]LB[cf:B][df:A][ch:17]C[Gu chose to approach at Black 17. This is the vital point for attacking White's one space jump enclosure and, because of this, White doesn't usually jump at A these days, preferring to enclose at B instead.];W[cj];B[eh];W[cg](;B[bg]LB[bg:21][cg:20][eh:19][cj:18]C[Black's hane at Black 21 was a light move.];W[bf];B[fe](;W[po]LB[fe:23][bf:22][po:24]C[White 24 was the biggest move on the board.];B[nq](;W[op]LB[op:26][nq:25]C[Peeping first at White 26 was very good in this situation.](;B[oq]LB[oq:27]C[Black's solid connection at Black 27 was a proper move.];W[qp](;B[ri]LB[ri:29][qp:28]C[Black didn't want to follow White's plan, so he ignored White 28 and pushed underneath at Black 29.];W[qq];B[kq](;W[qm]LB[ch:A][qm:32][np:B][kq:31][qq:30]TR[nq][oq][pq]C[Extending at Black 31 was necessary, to settle the marked stones, and extending at White 32 was the right continuation.The result up to here seems slightly better for White, because White settled very comfortably inside Black's moyo and Black didn't gain significant compensation in the process.The only questionable move up to here was Black A. Therefore, we can conclude that Black should have played Black A at B, as we discussed earlier.];B[pm](;W[bh]LB[bh:34][pm:33]C[When Black attached at Black 33, responding locally would be normal. It's hard to consider tenuki in this kind of situation and Lee's move at White 34 was extraordinary.](;B[nf]LB[nf:35]TR[pf][qf][nh][qi]C[Black 35 hit the vital point of White's marked stones. It's hard for White to make a good shape now. Remember that when you want to make a base in the center, you should try to create a box like shape. Black 35 prevents White from making a base by stopping him from playing at 35 himself.When playing in the center, moves like Black 35 are very similar to playing a pincer on the side. It's worth spending some time to reflect carefully on this situation.];W[qc](;B[re]LB[qc:36][re:37]C[Extending at Black 37 seems natural in this situation, but Lee Sedol's brilliant strategy in the game revealed this move to be questionable later on.The explanation of why Black 37 is questionable is incredibly subtle and complicated. We'll provide more variations explaining White's strategy when we publish our book about this match.];W[oc];B[nc];W[nb];B[mb](;W[rb]LB[mb:41][nb:40][rb:42][nc:39][oc:38]TR[pf][qf][nh][qi]C[The kosumi at White 42 was the best move, occupying the vital point, and it's impossible for Black to capture White's corner stones now.Attacking White's marked stones isn't easy either. White's already lived in the corner, which was worth about 20 points, so White's already extracted sufficient value from the marked stones. Because of that, White can happily sacrifice the marked stones as long as he can get compensation elsewhere.](;B[ob]LB[ob:43]TR[pf][qf][nh][qi]C[Cutting at Black 43 was to be expected. Attacking White's marked stones at this stage was too uncertain, so Black took immediate profit.];W[pb];B[na];W[nj];B[pi](;W[fg]LB[na:45][pb:44][fg:48][pi:47][nj:46]C[Jumping at White 46, to reinforce White's weak stones, was very nice. White's group remained light, so he didn't need to answer when Black attached at Black 47. White's group in top right corner was already half alive, and this helped White to play more flexibly.The knight's move at White 48 was a well timed counter-attack, which changed the flow of the game.];B[bi](;W[ag]LB[ag:50][bi:49]C[Capturing Black's stone with White 50 was the right move.](;B[hi]LB[eg:A][hi:51]TR[ch][eh][bi]SQ[nh][nj]C[Flying out with Black 51 showed Gu's exquisite sense of play in the center.This move helps Black's marked stones on the left, and aims to cut at A as well. Furthermore, it will help to attack White's marked stones on the right side later.](;W[rl]LB[rl:52]TR[pf][qf][qi]C[The kosumi at White 52 was very sophisticated. Lee provoked Black into capturing White's marked stones, simplifying the game in the process.Lee might have felt the opening was satisfactory for White, so he was happy to sacrifice the marked stones.];B[oh];W[og](;B[qn]LB[og:54][oh:53][qh:C][pj:D][qj:A][qk:B][rk:E][qn:55]TR[pf][qf][qi]C[The attachment at Black 53 was a nice move, which cut off White's marked stones, but Lee didn't give up his stones on the right side easily.If Black plays Black 53 at 54 instead, White will push at A, making miai of B and C. If Black chooses to Block at B, then pulling back to C makes D and E miai for White.Black's hane at Black 55 was a well timed probe, and you'll soon see why.](;W[pn]LB[pn:56]C[White's cut at White 56 was the right move. This was what Black wanted, but White was happy to go along with Black's plan.](;B[ql]LB[ql:57]C[The atari at Black 57 was the right move, but it didn't change the flow of the game.];W[rm](;B[ng]LB[ng:59][rk:A][rm:58]C[Cutting at Black 59 was the right move, because A isn't sente for Black.It looked like White was in trouble, but he had an brilliant trick up his sleeve.];W[ph];B[oi];W[qj];B[qh];W[qk];B[pg](;W[rd]LB[rd:66][rf:A][pg:65][ph:60][qh:63][oi:61][qj:62][qk:64]TR[pf][qf][og]C[White 60 and White 62 formed a good combination, and cutting at Black 63 was inevitable (as we saw earlier). White saved his two stones with White 64 and Black 65 was necessary, to capture White's marked stones.The result up to Black 65 looks even, but White 66 was a very big move, and White took the lead. White's marked stones aren't actually captured yet, because White can save them with A later.Since Black still has to spend another move to capture the marked stones, his position isn't simply thick, but over-concentrated.];B[eg];W[ec](;B[ed]LB[ec:68][ed:69][eg:67]C[Black 67 was the most important point on the board now, and White 68 was also a good move.Pinching at Black 69 is very unusual in this kind of situation, but it was the correct move in this case.];W[dc];B[eb];W[db](;B[bp]LB[bb:D][cb:C][db:72][eb:71][fb:A][dc:70][co:B][bp:73]C[Black's hane at Black 71 was a good exchange, preparing to take sente, and White's response at White 72 was good.If Black 71 is at A, White will tenuki and complete the lower left corner with B. However, if White ignores Black 71 and plays White 72 at B, Black will push at 72, followed by White C, Black D. Even though it doesn't look like it, 72 is worth 21 points.Invading at Black 73 was the proper move in this game.](;W[cp]LB[bp:A][cp:74]C[The headbutt at White 74 is the most common response against Black's low approach at Black A, and it was the right choice in this game.];B[bo];W[bq];B[cm](;W[iq]LB[cm:77][bo:75][bq:76][iq:78]C[Extending at White 78 was the biggest move on the board. This sort of two space extension is worth more than 20 points.];B[ci];W[bj](;B[ej]LB[ci:79][bj:80][ej:81]C[Jumping at Black 81 was the proper move.];W[dj];B[br](;W[cq]LB[ai:A][dj:82][aq:B][cq:84][br:83]C[Connecting under at A wouldn't be in keeping with Lee's style of play. He wanted to gain something more from this battle.The attachment at Black 83 is a well known probe, and connecting at White 84 was the right response. If White extends at B...];B[em];W[ef](;B[ei]LB[ef:86][ei:87][em:85]C[Jumping out at Black 85 was necessary, and White 86 was well timed probe.];W[ff];B[ai];W[rf](;B[aq]LB[ff:88][rf:90][ai:89][ei:A][aq:91]C[Connecting at White 88 was very big. Instead of White 88, connecting under with 89 would show a lack of fighting spirit and would allow Black to take both the key points at 88 and A.The overall result up to Black 89 was favorable for White, because the game became simpler and Black's potential at the top was reduced dramatically.Black got some compensation in the lower left and locally the trade was even. However, White used sente to save his stones on the right side and maintained his lead.];W[kr](;B[jr]LB[jr:93][kr:92]C[The attachment at White 92 was typical of Lee's style of play.](;W[lq]LB[lq:94]C[The hane at White 94 was a very severe move, and it became hard for Black to manage the situation.](;B[jq]LB[jq:95][lr:A]C[Black couldn't expect a good result after cutting at A. The connection at Black 95 was his best alternative.];W[mq](;B[hq]LB[hq:97][mq:96]TR[cp][dp][bq][cq][fq]C[Black chose to attack White's lower left group instead, and it was a good decision.];W[lo](;B[cr]LB[lo:98][cr:99]C[Pushing at Black 99 was the right way to attack. This move looks small, but it's the vital point for stealing White's eyespace.](;W[hp]LB[hp:100]TR[cp][dp][bq][cq][fq]SQ[nq][oq][pq]C[White managed his weak group lightly with the hane at White 100. White had already captured three Black stones in the bottom right, so he didn't need to save all of the marked stones.This game contains many examples of light and flexible play from White and is worth studying carefully. Often when you find yourself inside your opponent's sphere of influence, the most important thing is to focus on establishing a viable group within that area, rather than trying to save all your stones.];B[ip];W[io];B[ir];W[dn];B[dm](;W[jo]LB[dm:5][dn:4][io:2][jo:6][ip:1][ir:3]TR[cp][dp][bq][cq][fq]C[Black 101 and Black 103 were necessary, and White 106 was a very nice move to simplify the game.White was leading by a comfortable margin in terms of territory, so Black needed to play aggressively here, to catch up. However, it's not easy to capture all of White's marked stones now.](;B[ko]LB[ko:7]C[The wedge at Black 107 was an incredible and surprising move.](;W[kn]LB[kn:8]C[Falling back at White 108 was the correct answer, but Black managed to create some weaknesses in White's position.];B[kp];W[ln];B[ho];W[gp];B[hn];W[dr];B[fo];W[co](;B[bn]LB[bn:17][hn:13][ln:10][co:16][fo:15][ho:11][ko:A][gp:12][kp:09][dr:14]C[Cutting with Black 111 was what Gu had in mind when he played at A (Black 107).When Black struck the vital point at Black 115, pressing with White 116 was an excellent way to manage White's weak group.];W[go];B[gn];W[eo];B[fp];W[gq];B[fn];W[ep](;B[jn]LB[fn:23][gn:19][jn:25][eo:20][go:18][ep:24][fp:21][gq:22][er:A]TR[gp][hp]C[White 118 and White 120 helped White to make another eye. Black can still bully White with A, but it doesn't work very well, as we'll see in the variation.Instead of White 122, playing atari at White 124 is another way to make two eyes, but the marked cutting stones are very valuable, so White shouldn't be too hasty to sacrifice them.](;W[fr]LB[fr:26][gr:A][cs:B]C[White 126 was the proper move for making life. If White plays at A instead, descending at B will be sente later.];B[pl];W[rk];B[nl];W[ll](;B[fb]LB[fb:31][hf:A][rk:28][ll:30][nl:29][pl:27]C[Connecting at Black 131 was very big. It's a 10 point reverse sente endgame move. However, playing in the center at A would be slightly better.];W[hf](;B[rg]LB[hf:32][rg:33][rh:A]C[Jumping out at White 132 was very good, and White was still in the lead. Black 133 was necessary, to defend against White's tesuji at A.];W[pe];B[lr];W[mr];B[ks];W[jm];B[in];W[gd](;B[hc]LB[hc:41][gd:40][pe:34][jm:38][in:39][lr:35][mr:36][ks:37]C[Black 135 was another big endgame move. It was worth 10+ points.];W[hd];B[id];W[ie](;B[fd]LB[fd:45][hd:42][id:43][ge:A][ie:44]C[White 142 and White 144 were nice and practical moves. Black 145 wasn't just big, it also aimed to exploit White's weakness at A later on.];W[jd];B[ic];W[kd](;B[gf]LB[ic:47][jd:46][kd:48][gf:49]C[Black 149 was a well timed probe.](;W[hh]LB[hh:50]C[White's attachment at White 150 was a flexible, indirect response.];B[jf];W[je];B[gg];W[gh](;B[ge]LB[ge:55][je:52][jf:51][gg:53][gh:54][hh:A][ii:B]C[Black's peep at Black 151 was sharp and Black 153 was the right response to White A (White 150).Instead of Black 151, if Black plays at Black 155 immediately, White will hane at B and stretch out comfortably.](;W[kf]LB[kf:56]C[The hane at White 156 was the right move, and it was hard for Black to attack this White group severely.];B[jg];W[kg];B[jh];W[kh];B[ji];W[ki];B[jj];W[ni];B[of];W[fh];B[sf];W[qd];B[se];W[od];B[ms];W[nr];B[he](;W[nm]LB[od:70][qd:68][he:73][se:69][if:B][of:65][sf:67][hg:A][jg:57][kg:58][fh:66][jh:59][kh:60][ji:61][ki:62][ni:64][jj:63][pj:C][ok:D][nm:74][nr:72][ms:71]C[Extending at Black 161 was unavoidable, but White had no problems connecting his groups. Instead of Black 161, the hane at 162 would be an overplay and White would cut with 161 in response.Black 165 was necessary because Black had to defend his right side group, and White 166 reinforced White's center stones indirectly.Black 173 wasn't just a big endgame move, it also disconnected White's center group (A and B are miai).White 174 was an excellent indirect move, to grab some quick points before returning to defend the center more firmly. It was very hard for Black to resist this attachment, because there was a weakness around C and D.];B[oe];W[pc];B[le];W[ke];B[da];W[ca];B[ea];W[cb];B[mm];W[ml];B[nn](;W[pj]LB[ca:80][da:79][ea:81][cb:82][pc:76][ke:78][le:77][oe:75][pj:86][ml:84][mm:83][nn:85]C[Black 175 to Black 181 were time saving exchanges. Gu was reading the hane at Black 183 carefully because, if he played elsewhere, it would be very difficult for Black to catch up after White reinforced at White 184.];B[oj](;W[om]LB[oj:87][om:88]C[White 188 was a very powerful move. Other Korean pros were surprised and worried when Lee played here, because they hadn't read as deeply as Lee yet.](;B[or]LB[ok:B][om:A][mo:D][np:C][or:89][ns:E]C[Since White played at A instead of B, Black had to make something happen inside White's lower right area.Black 189 was a good way to start. If White cuts at B next, Black will be happy to connect under with C to E.];W[ns];B[on];W[ok];B[ol];W[nk];B[pp](;W[qo]LB[nk:94][ok:92][ol:93][on:91][qo:96][pp:95][ns:90]C[Separating Black with White 190 was inevitable, and Black went all out with Black 191.Black 195 was a nice move, and it looked like White was in deep trouble.];B[oo](;W[os]LB[nm:B][om:A][oo:97][os:98]C[When Black cut at Black 197, pushing on the 1st line at White 198 was a brilliant move.This was the only move to prevent Black from making two eyes in the corner, and this kind of technique is incredibly rare.It looks like Lee had already found this move when he played at A (White 188), or even earlier when he attached at B (White 174), and that's amazing.](;B[np]LB[mo:A][lp:B][np:99]C[Capturing a stone with Black 199 was better than playing at A or B, but it still didn't help Black to live.];W[mo];B[qr];W[rr];B[rs](;W[ps]LB[mo:200][qr:1][rr:2][ps:4][rs:3]C[White 200 was the vital point, and Black could only make one eye in the center.When Black haned at Black 203, extending at White 204 was the best way to kill Black's center group without fighting a ko.];B[rq](;W[pr]LB[rq:5][pr:6]TR[pk][nl][ol][pl][ql][mm][pm][nn][on][oo][np][pp][nq][oq][pq][or]C[Cutting at White 206 was the right move. Black's marked group died and the game was practically over here.];B[sr];W[sp];B[rp];W[ro];B[qs];W[il];B[ik];W[hl]LB[ik:13][kk:A][hl:14][il:12][ro:10][rp:9][sp:8][sr:7][qs:11]C[Black 211 was necessary, and the result up to White 212 was very good for White.Even though Black lived in the corner, he lost more than five points in total, and the game was over when White played in the center at White 212.If White had played at A next, he would have won comfortably, by more than 10 points, and the game would have been a masterpiece for Lee. I couldn't find any mistakes in White's play up to White 212.However, White 214 was a big oversight. Lee might have thought that White 214 was more severe, but it was too much.This kind of situation, where an important game is practically over, is the most critical time to maintain your attention. This is true for professionals and amateurs alike.];B[lj];W[kj];B[mh](;W[mk]LB[mh:17][kj:16][lj:15][mk:18]C[Black 215 was a very sharp move, and 217 was a nice followup. The game suddenly became tense again.Connecting at White 218 was the right move, but White's shape had already become brittle.];B[kk];W[kl];B[mi](;W[if]LB[if:22][mi:21][kk:19][kl:20]C[Black 219 and Black 221 were nice moves which disconnected White's center group, and White 222 became necessary in order to connect.](;B[jl]LB[jl:23]C[Black 223 was an unexpected, nice move which made a ko. It's very difficult to come up with this sort of move here, but since White's bottom group doesn't have many liberties, this move works reasonably well.Black was trying to make the game complicated, and he was succeeding up to here.];W[jk];B[no];W[nm];B[om];W[mn];B[jl];W[im];B[hk](;W[jk]LB[hk:31][jk:32][jl:29][im:30][nm:26][om:27][mn:28][no:25]C[White didn't have enough ko threats, so he connected at White 230. However, Black maintained the pressure with Black 231.];B[sq];W[so];B[jl];W[ih];B[gl];W[jk];B[sk];W[sl];B[jl];W[ls];B[hm];W[jk];B[sn];W[rn];B[jl](;W[lm]LB[ih:36][jk:44][sk:39][gl:37][jl:47][sl:40][hm:43][lm:48][rn:46][sn:45][so:34][sq:33][ls:42]C[White had to connect his center group with White 236 and Black blocked at Black 237.The game had already become complicated again, and it was because of White's overplay at A (White 214).White 240 was necessary, and Black had more ko threats than expected on the right side.The atari at White 248 was the right move, but White had already lost a lot of points here.However, Lee still kept his cool and didn't in panic, even though the game took a wrong turn.];B[km];W[kr];B[qg](;W[js]LB[qg:51][km:49][kr:50][js:52]C[Lee was sure that White was still winning the game, so he eliminated the ko at White 252. This was the best way to play at this point.];B[pd];W[cs];B[ar];W[lk]LB[kb:E][lb:C][kc:D][lc:B][pd:53][lk:56][hl:A][ar:55][cs:54]C[Up to Black 253, White had lost nearly 10 points since extending at A (White 214). Fortunately for White, he still maintained his lead.White 256 was a small mistake. White should have exchanged B-E in sente first.In any case, the game was over here.];B[lc];W[jk];B[ii];W[jm];B[il];W[ld];B[md];W[bs];B[gs];W[sj];B[si];W[fs];B[is](;W[hr]LB[lc:57][ld:62][md:63][ii:59][si:67][sj:66][jk:58][il:61][jm:60][hr:70][bs:64][fs:68][gs:65][is:69][ks:A]C[White could simplify the game by connecting at A, but Lee might have thought that White 270 was better for the endgame.];B[ks];W[kc];B[kb];W[js];B[hs];W[gr];B[ks];W[fi];B[fj];W[js];B[cn];W[en];B[ks];W[gi];B[gj];W[js];B[sd];W[sc];B[ks];W[la];B[lb];W[js];B[eq];W[dq];B[ks];W[ap];B[ao];W[js];B[ds];W[es];B[ks];W[sh];B[rh];W[js];B[ah];W[bg];B[ks];W[lf];B[mg];W[js];B[sb];W[sa];B[ks];W[lr]LB[la:90][sa:12][kb:73][lb:91][sb:11][kc:72][sc:88][sd:87][lf:08][bg:06][mg:09][ah:05][rh:03][sh:02][fi:78][gi:84][fj:79][gj:85][cn:81][en:82][ao:97][ap:96][dq:94][eq:93][gr:76][lr:14][ds:99][es:00][hs:75][js:10][ks:13]C[In the end, White didn't win the ko and connected at White 314, but it was about the same as if White had connected at 313 in the previous variation (at White 270).];B[me];W[pe];B[kk];W[dh];B[di];W[jk];B[ee];W[kk];B[de];W[ce];B[lp];W[mp];B[dg];W[pa];B[pf];W[oa];B[nb];W[pd];B[jp];W[sk];B[iq];W[js];B[im];W[km];B[ks];W[ds];B[js];W[ig];B[ap];W[hg];B[mf];W[as];B[lg];W[lh];B[mj];W[li]LB[ca:180][da:179][ea:181][la:290][na:45][oa:330][pa:328][sa:312][cb:182][db:72][eb:71][fb:131][kb:273][lb:291][mb:41][nb:331][ob:43][pb:44][rb:42][sb:311][dc:70][ec:68][fc:7][hc:141][ic:147][jc:9][kc:272][lc:257][nc:39][oc:38][pc:176][qc:36][sc:288][dd:4][ed:69][fd:145][gd:140][hd:142][id:143][jd:146][kd:148][ld:262][md:263][nd:13][od:170][pd:332][qd:168][rd:66][sd:287][ce:324][de:323][ee:321][fe:23][ge:155][he:173][ie:144][je:152][ke:178][le:177][me:315][oe:175][pe:316][qe:11][re:37][se:169][bf:22][df:8][ef:86][ff:88][gf:149][hf:132][if:222][jf:151][kf:156][lf:308][mf:345][nf:35][of:165][pf:329][qf:10][rf:90][sf:167][ag:50][bg:306][cg:20][dg:327][eg:67][fg:48][gg:153][hg:344][ig:342][jg:157][kg:158][lg:347][mg:309][ng:59][og:54][pg:65][qg:251][rg:133][ah:305][bh:34][ch:17][dh:318][eh:19][fh:166][gh:154][hh:150][ih:236][jh:159][kh:160][lh:348][mh:217][nh:16][oh:53][ph:60][qh:63][rh:303][sh:302][ai:89][bi:49][ci:79][di:319][ei:87][fi:278][gi:284][hi:51][ii:259][ji:161][ki:162][li:350][mi:221][ni:164][oi:61][pi:47][qi:14][ri:29][si:267][bj:80][cj:18][dj:82][ej:81][fj:279][gj:285][jj:163][kj:216][lj:215][mj:349][nj:46][oj:187][pj:186][qj:62][rj:15][sj:266][hk:231][ik:213][jk:320][kk:322][lk:256][mk:218][nk:194][ok:192][pk:5][qk:64][rk:128][sk:334][gl:237][hl:214][il:261][jl:247][kl:220][ll:130][ml:184][nl:129][ol:193][pl:127][ql:57][rl:52][sl:240][cm:77][dm:105][em:85][hm:243][im:337][jm:260][km:338][lm:248][mm:183][nm:226][om:227][pm:33][qm:32][rm:58][bn:117][cn:281][dn:104][en:282][fn:123][gn:119][hn:113][in:139][jn:125][kn:108][ln:110][mn:228][nn:185][on:191][pn:56][qn:55][rn:246][sn:245][ao:297][bo:75][co:116][eo:120][fo:115][go:118][ho:111][io:102][jo:106][ko:107][lo:98][mo:200][no:225][oo:197][po:24][qo:196][ro:210][so:234][ap:343][bp:73][cp:74][dp:2][ep:124][fp:121][gp:112][hp:100][ip:101][jp:333][kp:109][lp:325][mp:326][np:199][op:26][pp:195][qp:28][rp:209][sp:208][aq:91][bq:76][cq:84][dq:294][eq:293][fq:6][gq:122][hq:97][iq:335][jq:95][kq:31][lq:94][mq:96][nq:25][oq:27][pq:3][qq:30][rq:205][sq:233][ar:255][br:83][cr:99][dr:114][fr:126][gr:276][hr:270][ir:103][jr:93][kr:250][lr:314][mr:136][nr:172][or:189][pr:206][qr:201][rr:202][sr:207][as:346][bs:264][cs:254][ds:340][es:300][fs:268][gs:265][hs:275][is:269][js:341][ks:339][ls:242][ms:171][ns:190][os:198][ps:204][qs:211][rs:203]C[The game ended after 350 moves and White won by 2.5 points.Lee Sedol won the MLily Gu vs Lee Jubango with a 6-2 score! Because Lee Sedol won six games, the last two games of the 10 game match won't be played, which is slightly disappointing for Go fans. However, these were the rules agreed upon at the start of the match.For winning this match, Lee Sedol received a prize of 5,000,000 RMB, which was worth more than $800,000 USD at the time of writing. This was the largest prize for any Go match in the world to date.Lee Sedol's play in this game was practically flawless up until White 214. If he'd played White 214 at White 322 the game would have been over much earlier and it would have been his masterpiece.This match must have been disappointing for Gu Li by this stage, but he maintained his fighting spirit until the very end and never let up on Lee.White 26 and White 28 were interesting moves and White got off to a good start up to White 34. Black 51 was an excellent move and White 52 was a very clever response, which incited a complicated trade. White took the lead up to White 66.White 92 and White 94 were a razor sharp combination and White pulled further ahead up to White 98. Black 107 was a brilliant tesuji, and Black gained ground up to Black 125, but White was still in the lead.Black 131 was a small mistake, which should have been at 132. White 174 was a clever jab and White established a clear lead. Black resisted with Black 183 and Black 185, which was appropriate because he was behind. However, White 188 was powerful and unexpected, and it became the winning move. White's exquisite turn at White 198 delivered the coup de grace.The game should have been over after White played at White 212, but White momentarily faltered at White 214 and Gu Li was able to complicate the game again with his sharp and forceful play. Up to Black 253, Black earned almost 10 points, but it wasn't enough to reverse the game.The eight games of this match were played at a very high level and the players created some beautiful game records together. A few readers who followed our commentaries throughout the match said that these games contained more mistakes than other significant games from the past, but that's not actually true.Because these games are very important, we've analyzed them in extreme detail and each commentary took days (or even weeks) to complete. Many of the moves which have been pointed out as mistakes are relatively minor and wouldn't have been mentioned or regarded as a mistake in shorter commentaries, or game collections from the past. The culture in the past was to treat top players with reverance and make them seem godlike, so smaller mistakes and suboptimal moves were disregarded out of respect. However, even the greatest Go players of all time were still human and still made mistakes.Even though the eight games from this match are not perfect, I hope that Go players around the world will still appreciate their beauty and study them for years to come. I will be gratified if these commentaries help you to gain more insight into the games of these two masters.This is our last commentary for this match, but if you've enjoyed studying these games, we'll be publishing a book about the Lee Sedol - Gu Li rivalry, focusing on this jubango. Our book will include much deeper discussion of the opening, and modern opening theory, as well as new variations and lessons in positional judgment.Because this is the most significant Go match for decades, we're taking some time to ensure the book is as good as possible. It will be available in a few months and you can visit this page for more details: https://gogameguru.com/lee-sedol-vs-gu-li-go-book/If you have any questions or comments about this game, please feel free to leave a comment.Commented by Younggil An 8phttps://gogameguru.com/])(;W[ks];B[gr];W[lf];B[mf];W[pe]LB[pe:5][lf:3][mf:4][gr:2][ks:1]C[White could also connect at White 1. In this case, White would win by 1.5 points.]))(;W[pd];B[lr];W[lk];B[ms];W[jk]LB[pd:1][jk:5][lk:3][lr:2][ms:4]TR[pe][pf][qf][rf]C[Answering at White 1 is also possible. Black will fight the ko at Black 2, but White can make a kind of double ko by cutting at White 3. However, the game is still quite complicated, and Lee was sure that he could still win by sacrificing the marked stones in the actual game.]))(;W[km];B[ms];W[mp];B[ls];W[lm];B[lk]LB[pa:B][hg:C][lk:6][km:1][lm:5][mp:3][er:A][js:D][ls:4][ms:2]C[If White connects at White 1, Black will make a more serious ko up to Black 6.This is a one step ko, and it's a big burden for White. Black still has some nice ko threats, like A to C, but White has only one at D.]))(;W[gl];B[hg];W[ig];B[ih];W[jk];B[lp];W[mp];B[jl];W[lk];B[jk];W[gj];B[mj];W[km];B[gk];W[fk];B[fj]LB[hg:2][ig:3][ih:4][gi:A][fj:15][gj:10][mj:11][fk:14][gk:13][jk:5][lk:9][fl:B][gl:1][jl:8][km:12][lp:6][mp:7]TR[jd][kd][ie][je][ke][hf][if][kf][kg][kh][ki][kj]C[White really wants to extend at White 1, but it doesn't work well. Black can isolate White's center group with Black 2 and Black 4, and White can't win the ko at 5, because Black has more ko threats.As you can see, White's center group will be captured up to Black 15.]))(;B[hg];W[ig];B[ih];W[lk];B[jk];W[jl];B[gj];W[li]LB[hg:1][ig:2][ih:3][li:8][gj:7][jk:5][lk:4][jl:6]C[Pushing and cutting with Black 1 and Black 3 is premature. White can connect at White 6 in sente, and connect his center group with White 8.White 6 in this sequence makes miai of Black 7 and White 8.]))(;W[lk];B[jk];W[li];B[jl];W[im];B[no];W[nm];B[om];W[mn];B[mj];W[mg];B[lp];W[mp];B[km]LB[mg:11][li:3][mj:10][jk:2][lk:1][jl:4][im:5][km:14][nm:7][om:8][mn:9][no:6][lp:12][mp:13]C[If White cuts with White 1 and White 3, Black will clamp at Black 4 and threaten to cut. If White connects at White 5, Black can still cause trouble inside of White's territory, as in the previous variation.]))(;W[lk](;B[mi];W[li];B[mj];W[mk];B[mg];W[jk]LB[mg:6][li:3][mi:2][mj:4][jk:7][lk:1][mk:5]C[Responding at White 1 is also conceivable. If Black plays at 2, White will happily manage the center up to White 7, but Black has a better plan.])(;B[jl];W[kl];B[jk](;W[im];B[mi];W[li];B[mj];W[mk];B[no];W[nm];B[om];W[mn];B[kk](;W[mg];B[lp];W[mp];B[km]LB[mg:15][li:7][mi:6][mj:8][jk:4][kk:14][lk:1][mk:9][jl:2][kl:3][im:5][km:18][nm:11][om:12][mn:13][no:10][lp:16][mp:17][is:C]C[The clamp at Black 2 is a nice move, and White will eventually find himself in trouble.Black can come back to Black 6 after exchanging Black 2 to White 5, and White should be careful about his shortage of liberties. If White still ataris at White 7, Black will revive his dead group with a snapback up to Black 18.])(;W[km];B[mg];W[if];B[hk];W[hg];B[gl];W[ls];B[lp];W[mp];B[ms]LB[if:17][hg:19][mg:16][li:7][mi:6][mj:8][hk:18][jk:4][kk:14][lk:1][mk:9][gl:20][jl:2][kl:3][im:5][km:15][nm:11][om:12][mn:13][no:10][so:B][lp:22][mp:23][er:A][ls:21][ms:24]TR[nh][ni][nj][nk][ok][hl][il][ll][ml][jm][kn][ln][lo][mo][lq][mq][mr][nr][pr][ns][os][ps]C[If White connects at White 15 instead, Black will save his cutting stones with Black 16. White should connect his center group with White 17 and White 19, but Black can block at Black 20 while White connects his stones.As you can see, White's big dragon at the bottom is in deep trouble up to Black 24. There are no ko threats for White, but Black still has some nice ko threats at A and B.]))(;W[li];B[im]LB[li:5][jk:4][lk:1][jl:2][kl:3][im:6]TR[hl][il]C[White should reinforce his weakness with White 5, but Black will cut at Black 6 and the marked stones will be wasted. This would be a big loss for White, but he can still play like this because he was winning by more than 10 points earlier.]))))(;W[sr];B[ro];W[rn];B[rp];W[qn];B[pr];W[qs];B[sq]LB[kl:F][km:E][lm:D][mn:B][qn:5][rn:3][no:C][ro:2][so:A][rp:4][sq:8][pr:6][sr:1][qs:7]TR[qi][pj][qj][qk][rk][rl][qm][rm][pn][po][qo][qp][qq]C[Extending at White 1 is an overplay. Black can squeeze in sente with Black 2 and Black 4, and White's marked stones will be captured up to Black 8.If White plays White 7 at A, Black connect at 7 in sente, and then play B-F as in the previous variation.]))(;W[rq];B[mn];W[no];B[lm];W[km];B[kl](;W[lj];B[jl]LB[lj:7][jl:8][kl:6][km:5][lm:4][mn:2][no:3][rq:1][ls:A]TR[jm][kn][ln][lo][mo][lq][mq][mr][nr][ns][os]C[If White connects at White 1, Black can push and cut with Black 4 and Black 6 in sente. White's marked group is in serious trouble after Black 8, and White will have to fight a very disadvantageous ko at A.])(;W[jl];B[mk];W[lk];B[lj];W[kk];B[mh];W[mj];B[kj]LB[mh:12][kj:14][lj:10][mj:13][kk:11][lk:9][mk:8][jl:7][kl:6][km:5][lm:4][mn:2][no:3][rq:1]TR[jd][kd][ie][je][ke][kf][kg][kh][ki]C[If White tries to extend his liberties with White 7, Black 8 and Black 10 comprise a severe tesuji combination. White's marked stones are captured up to Black 14.Instead of White 9, if White captures immediately at White 11, Black will hane with Black 12 and the situation is practically the same.])))(;B[mo];W[np];B[mp];W[lp];B[no];W[nm];B[om];W[mn];B[qr];W[rr]LB[nm:6][om:7][mn:8][mo:1][no:5][lp:4][mp:3][np:2][qr:9][rr:10][os:A]C[If Black attaches at Black 1, White will extend to White 2 now. After White 10, Black can't make another eye in the corner, because White A gives him a false eye.])(;B[lp];W[mp];B[mo];W[np];B[lm];W[km];B[kl];W[mn]LB[kl:7][km:6][lm:5][mn:8][mo:3][lp:1][mp:2][np:4]C[Black can also think about cutting at Black 1 and Black 3, but Black doesn't have a move after White crushes him with White 8.]))(;W[mo];B[no];W[nm];B[om];W[mn];B[qr];W[rr];B[rs];W[rq];B[os]LB[nm:3][om:4][mn:5][mo:1][no:2][mp:B][np:A][rq:9][qr:6][rr:7][os:10][rs:8]C[Threatening to cut with White 1 doesn't work well. Even though White remove Black's eye shape with White 3 and White 5, Black can make another eye in the corner with Black 6 to Black 10.Instead of White 1, if White plays at A, Black will atari at B and the sequence is practically the same afterwards.]))(;W[oo];B[qo];W[ro];B[lp];W[mp];B[np];W[rn];B[mo]LB[rn:7][mo:8][no:B][oo:1][qo:2][ro:3][lp:4][mp:5][np:6][kr:C][js:D][ls:A]C[If White connects at White 1 he'll fall into Black's trap. Cutting at Black 2 is a nice tesuji and Black can make a favorable one step ko up to Black 8 (White A to Black D creates the ko shape).]))(;B[nk];W[on];B[mk];W[lk];B[mj];W[lj];B[mh];W[il]LB[mh:7][lj:6][mj:5][lk:4][mk:3][nk:1][ok:A][il:8][ol:B][on:2]C[If Black still plays at Black 1, White will follow the same sequence as in the previous diagram.However, White has saved two points compared to the earlier variation, because he avoided exchanging A for B.]))(;W[ok];B[nk];W[om];B[ol];W[on];B[mk];W[lk];B[mj];W[lj];B[mh];W[il]LB[mh:10][lj:9][mj:8][lk:7][mk:6][nk:2][ok:1][il:11][ol:4][nm:A][om:3][on:5]TR[nh][ni][nj]C[Cutting at White 1 would have been easier and clearer for White.Black 2 is the only move and White can save White A through to White 5. Even if Black captures White's marked stones up to Black 10, White's still leading by a small margin.])(;W[nk];B[ok];W[ol];B[om];W[nl];B[on]LB[nk:1][ok:2][nl:5][ol:3][om:4][on:6]C[The atari at White 1 is wrong. Black can connect to his main group up to Black 6, and the game will be reversed.Instead of White 3, it might look like White can still cut by playing at 4, but he'll be caught in a snapback when Black ataris at Black 6.]))(;W[ok];B[om];W[pj];B[nk];W[oj];B[lm];W[km];B[kl];W[lk];B[jl](;W[mn];B[nm](;W[no];B[lp];W[mp];B[im];W[mo];B[lj];W[kk];B[kj]LB[kj:20][lj:18][oj:5][pj:3][kk:19][lk:9][nk:4][ok:1][jl:10][kl:8][im:16][km:7][lm:6][nm:12][om:2][mn:11][mo:17][no:13][lp:14][mp:15]TR[ll][ml]C[The attachment at White 1 is crude. Black will cut at Black 8, and White's shape is riddled with weaknesses.If White reinforces with White 11 and White 13, Black will attach at Black 18 to capture White's marked cutting stones.])(;W[mk];B[lp];W[mp];B[no];W[mo];B[np]LB[oj:5][pj:3][lk:9][mk:13][nk:4][ok:1][jl:10][kl:8][km:7][lm:6][nm:12][om:2][mn:11][mo:17][no:16][lp:14][mp:15][np:18]TR[jm][kn][ln][lo][lq][mq][mr][nr]C[If White takes care of his center stones with White 13, Black will push at Black 14.If White answers at White 15, Black will capture them all White's marked stones up to Black 18.If White plays at 16, instead of White 15, Black will be happy enough to cut at 15 and capture White's four stones at the bottom.]))(;W[mk];B[lp];W[mp];B[mo]LB[oj:5][pj:3][lk:9][mk:11][nk:4][ok:1][jl:10][kl:8][km:7][lm:6][nm:B][om:2][mn:A][mo:14][lp:12][mp:13]TR[jm][kn][ln][lo]C[Even if White doesn't exchange A for B, Black can still cut at Black 14 and capture White's marked stones in the center.])))(;W[kj];B[nn];W[no];B[jl]LB[kj:1][jl:4][nn:2][no:3]C[If White pushes from behind at White 1, Black will attach at Black 4 to enlarge his center area. Before that, he can exchange Black 2 for White 3 in sente and White didn't want to see that happen..]))(;W[hg];B[he];W[kf];B[jg]LB[he:2][kf:3][hg:1][jg:4]C[If White connects at White 1 first, Black will cut at Black 2. This is very similar to the actual game, but White would prefer not to exchange White 1 for Black 2 after Black 4.]))(;B[hg];W[ig];B[ge];W[ih];B[if];W[kf];B[jg];W[kh];B[kg];W[lg];B[he];W[jh];B[hf];W[mh];B[lf];W[mf];B[le];W[of]LB[ge:3][he:11][le:17][hf:13][if:5][kf:6][lf:15][mf:16][of:18][hg:1][ig:2][jg:7][kg:9][lg:10][ih:4][jh:12][kh:8][mh:14]TR[pg][rg][oh][qh][oi][pi][ri][rj][pk][nl][pl][ql][pm]C[If Black pokes at Black 1, White will connect up to White 4.If Black still wants to cut White's stones at the top with Black 9 and Black 15, White can connect at White 18 and Black's marked stones are in danger.]))(;W[gg];B[ge];W[he];B[jf];W[je];B[hg];W[ig];B[hh];W[kf];B[kh]LB[ge:2][he:3][je:5][jf:4][kf:9][gg:1][hg:6][ig:7][hh:8][kh:10]C[If White tries to save all his stones with White 1 and White 3, Black will attack severely with Black 4 and Black 6. White will be in danger after Black 10.This variation is too risky for White to seriously consider.]))(;B[je];W[jf];B[ke];W[le];B[kf];W[kg];B[lf];W[mf];B[lg];W[mg];B[lh];W[ne]LB[je:1][ke:3][le:4][ne:12][jf:2][kf:5][lf:7][mf:8][kg:6][lg:9][mg:10][lh:11]TR[pg][rg][oh][qh][oi][pi][ri][rj][pk][nl][pl][ql][pm]C[Cutting at Black 1 is also conceivable, but it doesn't work very well. Even though the ladder starting at White 2 doesn't work, White can still manage the situation up to White 12.Black's marked group will suddenly find itself under attack.]))(;B[je];W[jf](;B[kf];W[jg](;B[kg];W[kh];B[lh];W[gc];B[gb];W[hb];B[ic];W[fd]LB[ea:A][gb:9][hb:10][gc:8][ic:11][fd:12][je:1][jf:2][kf:3][jg:4][kg:5][kh:6][lh:7]C[Black can also think about enlarging his center territory with Black 1, but cutting at White 12 is also quite big. The hane at A will be sente later.])(;B[fd];W[ke];B[jd];W[lf]LB[fd:5][jd:7][je:1][ke:6][jf:2][kf:3][lf:8][jg:4]C[If Black backtracks at Black 5, White can capture Black 3 in a ladder up to White 8.]))(;B[ke];W[gc];B[gb];W[hb];B[ic];W[fd]LB[gb:5][hb:6][gc:4][ic:7][fd:8][je:1][ke:3][jf:2]C[If Black just extends at Black 3, White will still cut at White 8 after exchanging White 4 to Black 7.])))(;B[fd];W[ge];B[hc];W[id];B[ic];W[il]LB[hc:3][ic:5][fd:1][id:4][ge:2][il:6]C[Connecting at Black 1 is also possible. In that case, White will simplify the game up to White 6.]))(;B[lr];W[mr];B[ks];W[rh];B[rg];W[qg];B[sh];W[ph]LB[qg:6][rg:5][ph:8][rh:4][sh:7][pj:A][lr:1][mr:2][ks:3]TR[pk][nl][pl][ql][pm]C[There's a bad aji in the right hand side. If Black doesn't defend, White can make a ko with White 4 to White 8.If Black connects at 4, White will cut at A and the marked stones will be captured.]))(;B[hf];W[fb];B[gb];W[ea];B[gc];W[lj];B[lh]LB[ea:4][fb:2][gb:3][gc:5][hf:1][lh:7][lj:6]C[Playing in the center at Black 1 would have been better for Black. However, White can capture a stone with White 2 and maintains a small lead.]))(;W[in];B[jm];W[im];B[jl];W[il];B[jk];W[ik];B[jj]LB[hi:A][jj:8][ik:7][jk:6][il:5][jl:4][im:3][jm:2][in:1][gr:C][lr:B]TR[io][jo]SQ[ko][ip][kp][hq][jq][kq][ir][jr]C[Moving out with White 1 is too greedy. Black can simply extend up to Black 8 and Black A becomes a perfect attacking move. White can't escape and he can't win the capturing race between the marked groups either.Black can extend his liberties if he has to, with moves like B and C at the bottom.]))(;B[er];W[ds](;B[eq];W[fs];B[cn](;W[fr];B[en];W[hr];B[hs];W[iq];B[lp];W[mp];B[hq];W[ar];B[as];W[iq];B[lr];W[mr];B[hq];W[cs](;B[do];W[iq](;B[dq];W[jp]LB[cn:5][en:7][do:21][jp:24][lp:11][mp:12][dq:23][eq:3][hq:13][iq:10][ar:14][er:1][fr:6][hr:8][lr:17][mr:18][as:15][cs:20][ds:2][fs:4][hs:9]TR[ko][kp][jq][kq][ir][jr]C[Black 1 and Black 3 form a nice tesuji combination for stealing White's eye shape, but White can still make a ko with White 8.Once they start down this path, a ko fight is unavoidable, but Black doesn't have enough ko threats to win.Even if Black captures White's seven stones up to Black 23, the result it very good for White, because capturing the marked stones is much bigger.(White 16, White 22 at White 10)(Black 19 at Black 13)])(;B[jp];W[dn]LB[cn:5][dn:24][en:7][do:21][ap:B][jp:23][lp:11][mp:12][eq:3][hq:13][iq:10][ar:14][er:1][fr:6][hr:8][lr:17][mr:18][as:15][bs:A][cs:20][ds:2][fs:4][gs:C][hs:9]C[If Black falls back to Black 23, White will recapture the ko with White 24, and Black is in trouble.If Black plays elsewhere, White will capture the corner stones with A. And if Black connects at B, White can live with C.(White 16, White 22 at White 10)(Black 19 at Black 13)]))(;B[gr];W[bs]LB[cn:5][en:7][lp:11][mp:12][eq:3][hq:13][iq:10][ar:14][er:1][fr:6][gr:21][hr:8][lr:17][mr:18][as:15][bs:22][cs:20][ds:2][fs:4][gs:A][hs:9]TR[go][gp][hp][fq][gq]C[If Black eliminates the ko with Black 21, White will capture the corner stones with White 22.Even if Black captures the marked White stones with A later, he doesn't gain enough profit to catch up.(White 16, at White 10)(Black 19 at Black 13)]))(;W[en];B[dq]LB[cn:5][en:6][dq:7][eq:3][er:1][ds:2][fs:4]TR[dn][co][eo][cp][dp][ep][bq][cq]C[White would like to protect his eye by answering Black 5 with White 6. Unfortunately for White, he can't do so because Black will atari the marked stones with Black 7.]))(;B[gr];W[fr];B[fs];W[eq]LB[eq:6][er:1][fr:4][gr:3][ds:2][fs:5]C[The hane at Black 3 doesn't work. White can live on the inside up to White 6.])))(;B[cn];W[ar];B[as];W[cs](;B[bn];W[ds];B[ap];W[gr](;B[ep];W[lr];B[eq];W[er];B[dq];W[hr]LB[bn:5][cn:1][ap:7][ep:9][dq:13][eq:11][ar:2][er:12][gr:8][hr:14][lr:10][as:3][cs:4][ds:6]TR[ko][ip][kp][hq][jq][kq][ir][jr]C[If Black answers at Black 1, White will exchange White 2 for Black 7 in sente, and the kosumi at White 8 is a nice followup.If Black steals White's eye shape with Black 9, White can counter-attack with White 10 and Black's marked stones will be in grave danger. White will win the capturing race after White 14.])(;B[lr];W[mr];B[ks];W[ep]LB[bn:5][cn:1][ap:7][ep:12][ar:2][gr:8][lr:9][mr:10][as:3][cs:4][ds:6][ks:11]C[Black should defend himself first, with Black 9, but White will be happy to live up to White 12.This situation is hopeless for Black now, because White has too many points.]))(;B[ep];W[ds];B[eq];W[bs];B[er];W[fb]LB[fb:10][cn:1][ep:5][eq:7][ar:2][er:9][as:3][bs:8][cs:4][ds:6]C[Attaching at Black 5 is also conceivable, but White won't answer at 7. He'll connect at White 6 instead, to live in the corner.Locally speaking, the trade up to Black 9 is fair, but White takes sente to play at White 10, and the game is still good for White.])))(;W[kp];B[kn];W[jp];B[gp];W[ho];B[gq];W[fn];B[go];W[gn];B[hn];W[hm];B[in]LB[hm:11][jm:B][fn:7][gn:9][hn:10][in:12][jn:C][kn:2][go:8][ho:5][ko:A][gp:4][jp:3][kp:1][gq:6]C[Cutting from behind with White 1 seems like a natural way to punish Black, but Black 2 is sente and conceals a secret aim.Black will exchange Black 4 to White 7, before cutting with Black 8 and Black 10. White can't capture the cutting stones because of Black's earlier exchanges at A and Black 2. If not for Black 2, White could net with B or ladder at C now.This would be a disaster for White.]))(;B[gp];W[ho];B[fp];W[gq];B[eq];W[ep];B[gr];W[fo];B[fr];W[go]LB[fn:A][fo:8][go:10][ho:2][ep:6][fp:3][gp:1][eq:5][gq:4][fr:9][gr:7]C[Black 1 and Black 3 are too pedestrian. White will be happy to sacrifice his two stones up to White 10.Black gains more points than he did in the actual game, but White's outside becomes strong and powerful.Instead of Black 3, if Black connects at 4, White can play A and connect in style.])(;B[ho];W[gp];B[hn];W[gr];B[lr];W[mr];B[ks];W[dr]LB[hn:3][ho:1][gp:2][dr:8][gr:4][lr:5][mr:6][ks:7]C[If Black just cuts at Black 1, White 4 is sente, and White can make the eye-space up to White 8.]))(;W[gp];B[jo];W[in];B[gn];W[hn];B[jn];W[gm];B[fn]LB[gm:7][fn:8][gn:4][hn:5][in:3][jn:6][jo:2][gp:1]C[Extending at White 1 looks safer, but it's slack and heavy.Black 4 hits the vital point and steals White's eye shape, and White's group is still floating after Black 8.]))(;W[dr];B[gp]LB[gp:2][dr:1];W[fp];B[gr]LB[fp:3][gp:2][dr:1][gr:4]C[If White answers slavishly at White 1, Black will attack with Black 2 and Black 4. White doesn't have enough space to make two eyes, so blocking at White 1 is wrong in this case.]))(;B[gp];W[dn];B[dm];W[ar];B[as];W[cr]LB[dm:3][dn:2][gp:1][ar:4][cr:6][as:5][cs:A]C[If Black attacks with Black 1, White will throw in at White 4 and block at White 6.White's group is practically alive, because White can capture Black's corner stones with A next.];B[gr];W[fr];B[fp];W[cs];B[ap];W[bs];B[ar];W[bn]LB[dm:B][bn:8][dn:A][ap:5][fp:3][ar:7][fr:2][gr:1][bs:6][cs:4]TR[bo][bp][aq][br][as]C[If Black tries to keep attacking with Black 1, White can descend at White 4 and Black can't stop White from capturing some stones. If Black stubbornly continues up to Black 7, the nose tesuji at White 8 captures all the marked stones. Note the importance of exchanging A for B earlier in this sequence.]))(;B[np];W[mo];B[no];W[mn];B[nn];W[ko];B[ip];W[nm]LB[nm:8][mn:4][nn:5][ko:6][mo:2][no:3][ip:7][np:1]TR[nq][oq][pq]C[It's not easy for Black to move the marked stones out right away. Jumping at White 6 is sente, and 7 and 8 become miai for White.]))(;B[lr];W[mr](;B[mq];W[ls];B[lp];W[jq];B[lr];W[cn];B[bn];W[lq]LB[bn:9][cn:8][lp:5][jq:6][lq:10][mq:3][lr:7][mr:2][ls:4]C[If Black cuts at Black 1, White will atari at White 2. Black can make a ko with Black 3 and Black 5, but White has a very nice ko threat at White 8. Black must answer at Black 9, but he doesn't have a big ko threat of his own after White 10.])(;B[ks];W[mq];B[kp];W[mo]LB[lo:B][mo:6][kp:5][np:A][mq:4][lr:1][mr:2][ks:3]TR[nq][oq][pq]SQ[cp][dp][bq][cq][fq][iq]C[If Black just takes White's stone with Black 3, White will be happy to capture the marked stones up to White 6. White 4 in this sequence makes miai of A and 5, and after White 6, White will respond to A with B.Compared to the actual game, it's hard for Black to attack White's marked group in the bottom left.])))(;W[jq];B[lr];W[kp];B[ks];W[lq];B[kr];W[ir];B[lp]LB[kp:3][lp:8][jq:1][lq:5][ir:7][kr:6][lr:2][ks:4]C[Cutting at White 1 is normal, but it's not the best move in this game. As you can see, White hasn't gained anything up to Black 8.]))(;B[lr];W[jr];B[lp];W[fb]LB[fb:4][lp:3][jr:2][lr:1]C[Falling back to Black 1 is too passive and soft. White will sail smoothly towards victory with White 2 and White 4.]))(;B[se];W[pe];B[qd];W[od]LB[od:4][qd:3][pe:2][se:1]C[If Black tries to separate White with Black 1, White will connect his stones with White 2 and White 4.]))(;B[ff];W[ei];B[fi];W[di];B[fj];W[nl]LB[fb:D][ff:1][rf:A][di:4][ei:2][fi:3][ki:C][fj:5][nl:6][kr:B]TR[bj][cj][dj]C[If Black cuts at Black 1, White will wedge at White 2 to save his marked stones in sente. Black should reinforce his weakness at Black 5, but White will have sente to start managing the center with White 6.White is obviously leading in terms of territory, and has good moves like A-D next, so Gu didn't like this variation.]))(;W[aq];B[gq](;W[fr];B[em]LB[em:4][go:B][fp:C][aq:1][gq:2][hq:D][br:A][fr:3]C[Extending at White 1 is a bit greedy. The attachment at Black 2 is a good followup, in combination with A. Extending at White 3 is the best response, but the exchange is still profitable for Black (later Black can continue with moves like B-D).])(;W[gr];B[eq](;W[fp];B[cq]LB[fp:5][aq:1][cq:6][dq:A][eq:4][gq:2][cr:B][gr:3]C[White's hane underneath at White 3 is an overplay. The attachment at Black 4 is a sharp counter, and White is in trouble after Black 6. A and B are miai for Black next.])(;W[er];B[fp];W[fr];B[ep](;W[dq];B[en]LB[en:10][ep:8][fp:6][aq:1][cq:B][dq:9][eq:4][gq:2][cr:A][dr:C][er:5][fr:7][gr:3]C[White 5 doesn't improve White's prospects. Black will continue up to Black 10, after which his group has become very thick. That's because Black can still play A-C and squeeze White from the outside later. White's territory will crumble when does so.])(;W[dr];B[cq]LB[ep:8][fp:6][aq:1][cq:10][dq:B][eq:4][gq:2][cr:A][dr:9][er:5][fr:7][gr:3]C[Extending at White 9 is another mistake. Black 10 is a tesuji and A and B are miai for Black.])))))(;B[ai];W[ef];B[ff];W[ej](;B[ei];W[em]LB[ef:2][ff:3][ai:1][ei:5][ej:4][em:6]TR[cm][bo][bp]C[Descending at Black 1 is greedy. White can counter-attack with White 4 and White 6. Black should be worried about his marked stones now.])(;B[em];W[dh];B[di];W[ei];B[fh];W[dg]LB[ef:2][ff:3][dg:10][dh:6][fh:9][ai:1][di:7][ei:8][ej:4][em:5]TR[ch][bi][ci]C[Black doesn't have time to move out at Black 5, because White's tesuji combination at White 6 and White 8 is severe. Up to White 10, Black's marked stones are captured.])))(;W[ci];B[br];W[cq];B[hq]LB[ci:1][aq:A][cq:3][hq:4][br:2]C[Cutting at White 1 is safer, but too slow. Extending at Black 4 is really big, and the exchange of Black 2 for White 3 is profitable for Black.Connecting under at A is a nice followup for Black later.]))(;W[bn];B[cq];W[dq];B[br];W[cn];B[dr];W[er];B[ej]LB[ej:8][bn:1][cn:5][co:A][cq:2][dq:3][br:4][dr:6][er:7][cs:C][ds:B]C[Pincering at White 1 is also possible, but it's not appropriate, because the left side isn't valuable. Black's happy to jump at Black 8 and enlarge his center while reducing White's left side. In the midst of this sequence, crouching with Black 4 is a stylish move which makes miai of 6 and A for Black.If White ataris at B later, Black can answer at C to make a ko.]))(;B[bo];W[bp];B[co];W[cp];B[cl];W[ci]LB[ci:6][cl:5][bo:1][co:3][bp:2][cp:4]C[The low approach at Black 1 is also quite common, but White will be happy enclose more territory with White 2.The result up to White 6 is satisfactory for White.]))(;B[fb];W[ff];B[ef];W[ee](;B[fd];W[fh](;B[ei];W[fi];B[ej];W[fj];B[ek];W[fk];B[el];W[hk]LB[eb:A][fb:1][ec:B][fd:5][ee:4][ef:3][ff:2][fh:6][ei:7][fi:8][ej:9][fj:10][ek:11][fk:12][hk:14][el:13]C[Extending at Black 1 is normal, but White 2 and White 4 are a good combination, and Black is in trouble. If Black connects at Black 5 next, White can push and White 6, and the result up to White 14 is good for White, because Black's potential in the center has been erased.If Black 1 is at A, White will still play White 2 to White 14 as in this variation. Saving White B isn't as important as playing in the center.])(;B[fi];W[ei]LB[fb:1][fd:5][ee:4][ef:3][ff:2][fh:6][ei:8][fi:7]TR[eg][eh]C[The hane at Black 7 doesn't work, because White can cut immediately at White 8. The marked stones are captured.]))(;B[fh];W[fd];B[ge];W[gd]LB[fb:1][fd:6][gd:8][ee:4][ge:7][ef:3][ff:2][fh:5]C[If Black reinforces the center with Black 5, White can break through Black's top area with White 6 and White 8. Black is in trouble now.])))(;W[rh];B[rg];W[qg];B[ph];W[pj];B[oj];W[pl];B[ok]LB[qg:3][rg:2][ph:4][rh:1][oj:6][pj:5][ok:8][pl:7]TR[qi][qj][qk]C[If White still tries to cut and squeeze, starting with White 1, it doesn't work well anymore. White can't cut at 8, because his four stones are in atari after Black 6.]))(;B[rk];W[ng];B[rn];W[om];B[pl];W[fh]LB[ng:2][fh:6][rk:1][pl:5][om:4][rn:3]TR[rl][qm][rm]C[If Black plays at Black 1, White won't answer and will connect at White 2 instead. Even if Black captures White's marked stones, the result up to White 6 is good enough for White.]))(;B[rm];W[ql];B[pl];W[rn];B[ng];W[ph];B[oi];W[qj];B[qk];W[pj](;B[rk];W[ni];B[sl];W[fh]LB[ng:5][fh:14][ph:6][ni:12][oi:7][pj:10][qj:8][qk:9][rk:11][pl:3][ql:2][sl:13][rm:1][rn:4][ro:A]C[The atari and connection of Black 1 and Black 3 looks nice, but White 10 is a very good counter. The trade up to Black 13 is favorable for White and he'll be happy to return to the left side with White 14 now that his right side group is alive.If you prefer to play more safely, White 14 at A is also conceivable.])(;B[oj];W[qh];B[ok];W[rk]LB[ng:5][ph:6][qh:12][oi:7][oj:11][pj:10][qj:8][ok:13][qk:9][rk:14][pl:3][ql:2][rm:1][rn:4]TR[ri][rj]C[If Black saves his cutting stones instead, with Black 11 and Black 13, White can cut at White 14 to capture the two marked stones.This is also a good result for White.])))(;W[ng];B[pn];W[rn];B[qo];W[ro];B[pp]LB[ng:1][pn:2][rn:3][qo:4][ro:5][pp:6]TR[po][op]C[Saving the right side stones with White 1 is wrong. Black will be happy to cut White's marked stones up to Black 6, and Black's center suddenly becomes very thick and solid.])(;W[rn];B[ql];W[rm];B[pn];W[qo];B[ng]LB[ng:6][ql:2][rm:3][pn:4][rn:1][qo:5]C[If White falls back to White 1, Black will play Black 2 to Black 6. This is similar to the actual game, but slightly better for Black.]))(;B[ng];W[ph];B[oi];W[qj](;B[qk];W[qh]LB[ng:1][ph:2][qh:6][oi:3][pj:A][qj:4][qk:5][rk:B]C[Cutting at Black 1 doesn't work well. White will atari at White 2 and push at White 4. If Black blocks at Black 5, White will connect at White 6, and A and B are miai for White next.This is a disaster for Black.])(;B[qh];W[qk];B[pg];W[rh];B[rg];W[qg];B[ph];W[pj]LB[ng:1][pg:7][qg:10][rg:9][ph:2][qh:5][rh:8][ni:B][oi:3][oj:A][pj:11][qj:4][qk:6]TR[pk][pm]C[Cutting at Black 5 is a better choice, but it doesn't give Black a nice result. White 8 is a very nice tesuji, and White can squeeze Black up to White 11.Black's marked stones will become isolated and useless, because A and B are still sente for White. As you can see, Black's right side is over-concentrated and the result is very good for White.])))(;W[fh];B[mi];W[ni];B[qn];W[pn];B[om](;W[lk];B[rm]LB[fh:1][hi:B][mi:2][ni:3][lk:7][om:6][qm:A][rm:8][pn:5][qn:4]C[If White reinforces at White 1, Black will attack White's right side group with Black 4 and Black 6. Escaping with White 7 is unavoidable, and Black will be happy to capture White A with Black 8.This variation is what Black was aiming at when he played Black B.])(;W[ql];B[rn];W[rm];B[pl];W[ro];B[mk];W[mj];B[lj];W[li];B[mh];W[ki];B[kj];W[mg];B[lh];W[ji];B[lg];W[lk];B[kk];W[ll];B[ml];W[mm];B[nl]LB[lg:22][mg:19][fh:1][lh:20][mh:16][ji:21][ki:17][li:15][mi:2][ni:3][kj:18][lj:14][mj:13][kk:24][lk:23][mk:12][jl:A][ll:25][ml:26][nl:28][pl:10][ql:7][mm:27][om:6][rm:9][pn:5][qn:4][rn:8][ro:11]TR[pf][qf][nh][qi][nj]C[If White uses White 7 to extend to the vital point, Black will resist by sacrificing another stone with Black 8 and Black 10. Once Black becomes thick enough, he can attack to kill with Black 12.Even though Black 12 looks crude, White doesn't have a good response. White can try to fight back with White 13 and White 15, but he can't capture any of Black's cutting stones (e.g. with a move around A), so the marked stones will be captured on a large scale.White was happy to sacrifice some of the marked stones earlier, but allowing Black to swallow them up inside his large territory is too much.])))(;B[eg];W[ef];B[ff];W[fh];B[fi];W[gi];B[ei];W[hh]LB[ef:2][ff:3][eg:1][fh:4][hh:8][ei:7][fi:5][gi:6]C[Cutting right away, with Black 1 and Black 3, isn't a good idea. White can make good shape up to White 8, and it's very hard for Black to continue attacking White's center group.])(;B[fh];W[gg];B[gh];W[hg];B[ii];W[jh]LB[eg:A][gg:2][hg:4][fh:1][gh:3][jh:6][ii:5]TR[nh][nj]C[Pushing with Black 1 and Black 3 isn't very good either. Black's framework at the top has been erased and White 6 reaches out towards the marked stones. Because cutting at A is gote, It's very hard for Black keep the pressure on White in this battle.])(;B[sc];W[sb];B[qa];W[pa];B[ra];W[pe];B[qd];W[od];B[pc];W[oe];B[rc]LB[oa:B][pa:4][qa:3][ra:5][qb:A][sb:2][pc:9][rc:11][sc:1][od:8][qd:7][oe:10][pe:6]C[White's group in the corner isn't completely alive yet. If Black wants to capture it, he can do so with the combination of Black 1 and Black 3.In this case, White can try to resist with White 6 (or White 8) but neither come to much after Black 9. Black wins the capturing race in the corner up to Black 11.]))(;W[dh];B[ah];W[di]LB[ce:A][eg:B][ah:2][dh:1][di:3][cl:C]C[White shouldn't cut Black with White 1 and White 3. If he does, Black can choose between A to C later, and there's still some bad aji on the left side.]))(;W[ph];B[oi];W[oh];B[qh];W[lh];B[jh]LB[jh:6][lh:5][oh:3][ph:1][qh:4][oi:2]C[Trying to connect all White's stones with White 1 and White 3 is heavy and slow. Black will be happy to attack White's heavy group up to Black 6.]))(;B[pb];W[pc];B[ob];W[od];B[oe];W[pe];B[qd];W[rf]LB[ob:3][pb:1][pc:2][od:4][qd:7][oe:5][pe:6][rf:8]C[Attacking at Black 1 doesn't work, because of the weakness at White 4. Rather than capturing White, Black will find that his own stones are dead up to White 8.]))(;W[ob];B[pc];W[pb];B[rc];W[rb];B[qd];W[qb];B[sb];W[od];B[oe];W[pe];B[rg];W[mc];B[lb]LB[lb:14][ob:1][pb:3][qb:7][rb:5][sb:8][mc:13][pc:2][rc:4][od:9][qd:6][oe:10][pe:11][rg:12]C[Connecting at White 1 would usually be good, but it doesn't work well in this case. Black 2 and Black 4 are a nice way to attack the corner stones, and White can't make two eyes in the corner.White 9 and White 11 are the only way to fight, but Black can connect under with Black 12. Cutting at White 13 doesn't work either, so the whole corner will be captured.]))(;B[pc];W[re];B[qd];W[qh]LB[pc:1][qd:3][re:2][qh:4]C[Blocking at Black 1 is wrong. White will be happy to hane at White 2 in sente, and it will be of greatly assist White in settling his group.In most cases, answering at Black 1 is too passive and soft.])(;B[qd];W[nj]LB[pb:A][qd:1][nj:2]C[Answering at Black 1 is another common move. White will jump at White 2 now and can live in the corner with A later. This is another game.The game is still close in this case, though White is slightly ahead, and it's better for Black than the actual game.]))(;B[qn];W[pn];B[ql];W[rm];B[rn];W[om];B[pl];W[qc]LB[qc:8][pl:7][ql:3][om:6][rm:4][pn:2][qn:1][rn:5][ro:A]C[If Black hanes at Black 1, this is different to the previous variation. That's because White can atari at White 6 in sente, and attaching at A will also be sente later.White's bottom right group is practically alive already, so White will probe the top right corner with White 8.]))(;W[pn];B[ql];W[om];B[rm];W[pl];B[ol];W[pm];B[qh](;W[ph];B[pi];W[oi];B[qj]LB[ph:9][qh:8][oi:11][pi:10][qj:12][ol:6][pl:5][ql:2][rl:B][om:3][pm:7][rm:4][pn:1][rn:A]C[If White answers at White 1, Black will play Black 2 and Black 4 to settle on the right side. The result up to Black 12 is satisfactory for Black. In addition, extending at A will be annoying for White later.If White cuts at B now, Black will tenuki.])(;W[qk];B[qj];W[rl];B[og]LB[og:12][qh:8][qj:10][qk:9][ol:6][pl:5][ql:2][rl:11][om:3][pm:7][rm:4][pn:1]TR[pf][qf]C[Cutting and capturing two stones with White 9 and White 11 is small. Black will counter with Black 10 and Black 12, after which White's marked stones are in trouble.])))(;W[bh];B[qn];W[pn];B[qm]LB[bh:1][ri:A][qm:4][pn:3][qn:2]C[If White reinforces at White 1, Black will strike at the vital point with Black 2 - simultaneously making a base and attacking White. This is another example of the importance of being the first to occupy mutual eyespace.Compared to the variation we saw earlier (where Black played at Black 2 instead of Black A), Black has taken both the key points for power in this variation and White's lower right group still isn't completely settled.]))(;B[qq];W[rq](;B[rr];W[ro];B[sq];W[ri];B[nk];W[mo]LB[ri:6][nk:7][mo:8][ro:4][qq:1][rq:2][sq:5][rr:3]C[If Black answers at Black 1, White will come back and defend at White 6, after exchanging White 2 to Black 5 in sente. The result up to White 8 is favorable for White, because it's hard for Black to attack either of White group.])(;B[ri];W[ro]LB[ri:3][ro:4][qq:1][rq:2]C[If Black tenukis and plays at Black 3, White will be happy to make a nice shape with White 4. This White shape is better than in the game.]))(;B[qn];W[pn];B[qm];W[qq];B[kq];W[ri]LB[ri:6][qm:3][pn:2][qn:1][kq:5][qq:4]C[Black 1 is also a vital point, but White can improvise a makeshift defense by exchanging White 2 to Black 5. After that, White 6 is a key point for power, because it affects the shared eyespace of both groups.White's lower right group isn't quite settled yet, but it's hard for Black to attack because his right side group is also weak after White 6 and White already has good eye potential in the corner and the center.We can regard Black 1 and White 6 as miai.]))(;B[qq];W[mp](;B[mq];W[lp];B[lq];W[kp]LB[fg:A][kp:6][lp:4][mp:2][lq:5][mq:3][qq:1]TR[bg][ch][eh][rj][pk]C[Resisting with Black 1 doesn't work very well in this case, because White can develop power in the center with White 2 to White 6. In doing so, White is eyeing Black's marked weak group on the right side. He also aims to attack Black's marked stones on the left side (e.g. starting with A) as the fighting spreads.])(;B[np];W[no];B[mo];W[oq]LB[mo:5][no:4][mp:2][np:3][mq:C][oq:6][qq:1][nr:B][or:A][pr:D]C[Pushing and cutting with Black 3 and Black 5 is an overplay. White can calmly counter with White 6 and Black can't connect at A (if Black plays at A, White B-D would capture his stone).];B[mq];W[or];B[nn];W[oo];B[lp];W[ro]LB[nn:3][oo:4][ro:6][lp:5][fq:A][mq:1][or:2]TR[pq][qq]C[Black can offer a trade with Black 1. However, even though Black can make a ponnuki with Black 5, White will be satisfied to engulf the corner up to White 6. The marked stones are captured.Black's ponnuki isn't particularly valuable in this case, because White has already closed the bottom left corner with A.])))(;W[qq];B[qr];W[qp];B[rr];W[pm];B[nk]LB[nk:6][pm:5][qp:3][qq:1][qr:2][rr:4]C[The attachment at White 1 is also possible, and is more common. However, Lee didn't think this was the best sequence, because Black can easily move out with Black 6 and White has weak groups on both sides.])(;W[qp];B[qq];W[rq];B[rr];W[ro];B[sq]LB[ro:5][op:A][qp:1][qq:2][rq:3][sq:6][rr:4]C[Stepping into the corner first with White 1 isn't the right move order, because White's peep at A won't be sente anymore after Black 6.]))(;W[ff];B[ce];W[de];B[cf];W[dg];B[be];W[bh];B[af];W[dh];B[cc]LB[cc:10][be:6][ce:2][de:3][ee:A][af:8][cf:4][ff:1][dg:5][bh:7][dh:9]C[The attachment at White 1 is also conceivable, but then Black will peep at Black 2. The result up to Black 10 is good for Black, because the corner territory has changed hands in Black's favor.Instead of White 3, if White connects at 4, he won't have a good answer when Black plays at A or 3.])(;W[mp];B[op];W[jp];B[ri]LB[ri:4][jp:3][mp:1][op:2]C[Approaching at White 1 is also possible, but Black will be happy to enlarge his corner moyo up to Black 4.]))(;B[bh];W[ej]LB[bh:1][dh:A][ej:2]C[Extending at Black 1 is slack. White will jump at White 2 and Black will have to worry about the cutting point at A.]))(;B[np](;W[cj];B[jq]LB[cj:2][np:1][jq:3]C[Enclosing the lower right corner at Black 1 is also conceivable. White 2 and Black 3 are miai next.])(;W[jp];B[ch];W[cj];B[eh];W[cg];B[bg];W[bf];B[fe]LB[fe:9][bf:8][bg:7][cg:6][ch:3][eh:5][cj:4][po:A][jp:2][np:1]C[If White plays at the bottom, with White 2 for example, Black can still harass White with Black 3 and the result up to Black 9 is better for Black than the actual game. This is because exchanging Black 1 for White 2 makes it harder for White to invade around A, as he did in the actual game.])))(;W[ri];B[qj];W[oi];B[nj];W[mh];B[np]LB[mh:5][oi:3][ri:1][nj:4][qj:2][np:6]C[Answering at White 1 is a bit slow. Black can exchange Black 2 and Black 4, and can develop his bottom right corner up to Black 6. Black will be satisfied with this result.]))(;B[oi];W[rk];B[ql];W[rl];B[qn];W[re];B[rd];W[rf]LB[rd:7][re:6][rf:8][oi:1][rk:2][ql:3][rl:4][qn:5]C[Capping at Black 1 is not a proper way of attack. White can settle down too easily up to White 8.])(;B[qk];W[oi];B[nj];W[mh]LB[mh:4][oi:2][nj:3][rj:A][qk:1]C[The iron pillar at Black 1 is also possible, but attacking in this way applies less pressure to White than A does.]))(;B[qh];W[qc](;B[pc];W[qd];B[pe];W[rf];B[og];W[ge];B[hd];W[cj]LB[pc:3][qc:2][hd:9][qd:4][ge:8][pe:5][rf:6][og:7][qh:1][cj:10][pk:A][qo:B]C[Pincering at Black 1 isn't a proper move in this case. White can live in the corner in sente up to Black 7, and can then immediately reduce Black's potential at the top with White 8. The result up to White 10 is satisfactory for White.Black A seems misplaced in this variation and Black would rather that it had been played around B instead.])(;B[qd];W[pc];B[od];W[rd];B[re];W[rc];B[qe];W[nc]LB[jc:A][nc:10][pc:4][qc:2][rc:8][od:5][qd:3][rd:6][qe:9][re:7][qh:1]C[Blocking at Black 3 doesn't improve the result for Black. Black A is poorly placed after White 10. In conclusion the pincer at Black 1 isn't a good move in this opening.])))(;W[cf](;B[mc];W[hc];B[db](;W[cc];B[fe];W[kc];B[he]LB[db:4][cc:5][hc:3][kc:7][mc:2][fe:6][he:8][cf:1]C[If White responds normally at White 1, Black might enclose the top right corner at Black 2. This is another game, but Lee didn't seem to like prospect.])(;W[fd];B[ec];W[gd];B[cc]LB[db:4][cc:8][ec:6][hc:3][mc:2][fd:5][gd:7][cf:1]C[White can also enclose Black in exchange for outside influence, but the result up to Black 8 is satisfactory for Black. Lee doesn't like this sort of center oriented game.]))(;B[db]LB[db:2][cc:B][nc:A][cf:1]C[Sliding into the corner with Black 2 is also very common. White can consider A and B among his possible continuations.])))(;W[nc];B[pf];W[pb];B[fq];W[cn];B[jp]LB[pb:3][nc:1][pf:2][cn:5][jp:6][fq:4]C[Approaching the top right corner at White 1 is also possible. This is another game.]))