(;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[Lee-Sedol-Gu-Li-20140330]PW[Gu Li]PB[Lee Sedol]WR[9d]BR[9d]DT[2014-03-30]EV[MLily Gu vs Lee Jubango]RO[Game 3]PC[Chengdu, China]SO[http://gogameguru.com/]AN[An Younggil 8p]C[This is game 3 of the MLily Gu vs Lee Jubango, between Lee Sedol 9p and Gu Li 9p.Since Lee Sedol won the first two games, he should have had a psychological advantage going into this one. However, the mood of the series changed shortly before this game took place.One week earlier, there was another game between Gu Li and Lee Sedol at the 4th Zhaoshang Cup and Gu Li won. When I was watching that game, I felt that Lee was in poor form, and I thought that perhaps he was saving his energy and stamina for this jubango game.When Lee isn't in good form, he rushes and plays thin, territorial moves instead of solid moves that emphasize power. If you look at that game, you'll feel that Lee's play was different from these jubango games. The Zhaoshang Cup is a team competition and neither player would have cared about the winning or losing as much as they usually do. However, there was another game shortly afterwards which changed the flow of this match.The Round of 16 at the 10th Chunlan Cup took place just two day before this game. Gu and Lee were paired to play together once again (based on drawing lots). And this game was different. Both players did their best and you could feel their fighting spirit from the beginning until the very end of the game.Gu Li took the lead, after making a big trade on the right side, and maintained it throughout most of the game. Lee Sedol caught up near the end, with his characteristic fierce and powerful moves, and almost reversed the game. However, Gu managed to hold on to the smallest of leads amidst the chaos. Lee knew that he was losing by half a point, and that there was no way to catch up, so he resigned.Winning those two games seemed to restore Gu Li's confidence, and relieve the mental pressure he felt about playing Lee Sedol in this match. On the other hand, Lee Sedol suffered some psychological damage in losing that game and the bad news for him was that he only had one day to recover and calm his mind before this game.Some pundits said that Lee was only concentrating this jubango, and that if he won this game the earlier losses would soon be forgotten.Anyway, let's have a look at game 3 of the MLily Gu vs Lee Jubango.]RE[W+Resign]MU[1];B[pd];W[dd];B[pq];W[dp];B[qk]LB[dd:2][pd:1][qk:5][dp:4][pq:3]C[Lee started the game with the Chinese Opening at 1, 3 and 5. This isn't Lee's favorite opening, but it seems as if Lee might have tried to refresh his mind with a different style of opening. On the other hand, Gu likes to play a two star formation, at 2 and 4, against the Chinese Opening.];W[nc];B[pf](;W[jd]LB[pb:E][kc:G][lc:B][nc:6][qc:F][jd:8][le:C][pf:7][qk:5][jp:D][fq:A]C[Gu often used to play White 6 at A, but he deviated from his routine opening with this approach at White 6. After Black defended at Black 7, which is normal in this opening, White just extended to White 8 at the top. This move isn't popular anymore, but that doesn't mean this extension is bad.Pros stopped playing like this because it's easy for Black to invade at B later, and pros generally like territory. Black can also choose exchange C for B later and develop a big moyo instead. Black might consider this later if Black had stones around D at the bottom, for example.In contrast, if White follows another joseki with White E, Black F and White G, Black can't invade anymore and can only develop a moyo in the center later.Gu might have chosen to play an unusual opening with White 6 and White 8 to counter any preparation and research that Lee might have done before the game.];B[cf](;W[fc]LB[fc:10][jd:8][cf:9][fq:A]C[Approaching at A is more common, but Lee chose to approach at Black 9.];B[cn](;W[fq]LB[fc:10][bd:A][ci:B][dj:C][cn:11][fq:12]C[Black 11 was a tactical approach to the opening which has appeared in a number of games in recent years. Black could also continue with Black 11 at A or B, which would be simpler.Exchanging 12 for 11 and then extending to C, is another possible tactic which has been explored recently.];B[dj];W[mq];B[po];W[jp];B[kd](;W[je]LB[kd:17][je:18][ch:A][di:C][dj:13][dk:D][cl:B][po:15][jp:16][mp:E][fq:12][mq:14]C[Up to Black 13, Black settled his stones on the left side with an ideal position, but White was also happy to play at both the top and the bottom. The opening so far was even.Black's position on the left side looks nice, but actually, it's still quite weak. White can easily invade or attach with moves like A to D later, depending on the situation.Playing White 14 at the bottom was nice in this opening. Playing at E instead is also possible, but White 14 in the actual game was more practical and made it easier for White to claim the territory at the bottom.The left and right sides were occupied by Black, while White took the top and the bottom. This kind of opening is quite boring because the players just took all the big points. Because of that, it's unusual to see this sort of opening in top pros' games. They usually try to oppose one another's plans and play more aggressively in the opening.Black 17 was the first contact move in the game. Lee Sedol was ready to fight and Gu Li had several options now. Gu extended at White 18, which was the best response.];B[jc](;W[ke]LB[ic:B][jc:19][ld:A][je:18][ke:20]C[Pushing at White 20 was a good move. If Black simply extends at A, White will go back to hane at B and the exchange of White 20 for A will be good for White.];B[md];W[kc](;B[kb]LB[kb:23][kc:22][mc:A][md:21][ke:20]C[Jumping with Black 21 was the proper haengma for this situation.Playing the atari underneath at Black 23 is a nice tesuji, and is usually good technique, but simply playing at A would have been better in this case.];W[lc];B[mc];W[lb];B[mb];W[ld];B[la];W[jb];B[me]LB[la:29][jb:30][kb:23][lb:26][mb:27][lc:24][mc:25][ld:28][me:31]TR[cf][dj][cn]C[Extending at Black 31 was a good move. It secures the corner territory and also reduces White's thickness over the center.The result up to here looks favorable for Black, because Black has a very big corner territory. However, it was actually rather good for White, because White became very thick and Black's three stones on the left side became very thin as a result.];W[qm];B[pl];W[qp](;B[qq]LB[me:31][pl:33][qm:32][qp:34][qq:35]C[Invading at White 32 was a good move. White's influence at the top is very solid and powerful, so he can easily invade Black's moyo like this. Black 33 was a normal response, and White 34 was a good followup after White 32.](;W[ro]LB[ro:36][qq:35]C[White 36 was an unusual and interesting move.](;B[mp]LB[qo:A][ro:36][mp:37]C[Black attached at 37. It looks like Lee wanted to exchange a move here before playing at A, but this was questionable.](;W[pp]LB[mp:37][pp:38]C[White countered with White 38.];B[op];W[oo](;B[on]LB[on:41][oo:40][qo:A][op:39][pp:38]C[Pushing and cutting with White 38 and White 40 was a strong counter. Black lost his chance to play at A and the fighting suddenly became complicated and intense.];W[no](;B[pn]LB[on:41][pn:43][no:42][po:A]C[Black 43 looks like an overplay, but Lee might have thought that fighting like this was inevitable, because allowing White to capture Black A would leave black with an unfavorable result.];W[oq];B[np];W[rq](;B[or]LB[pn:43][np:45][oq:44][rq:46][or:47]C[The fighting became more serious with White 44 and White 46, and Black 47 was the only move for Black.];W[nq];B[lq];W[lp];B[mo];W[lr];B[rr];W[sr](;B[kq]LB[mo:51][lp:50][kq:55][lq:49][nq:48][lr:52][or:47][rr:53][sr:54]C[Black 47 and Black 49 were a good combination and the moves up to White 54 followed a single path.];W[nr](;B[pr]LB[kq:55][nr:56][pr:57]C[Black 55 and Black 57 were played in the right order.];W[kr];B[ns];W[mr](;B[qs]LB[kr:58][mr:60][ns:59][qs:61]C[Black 61 was a good move which created a flexible shape. ](;W[rk]LB[rk:62][qs:61]C[The attachment at White 62 was a brilliant move, as you'll soon see.](;B[rl]LB[rk:62][rl:63]C[Black had to hane on the inside with Black 63.];W[ql](;B[rm]LB[ql:64][rl:63][rm:65]C[Black 63 and Black 65 were inevitable. ](;W[qj]LB[qj:66][rk:62][rl:63][rm:65]C[The atari at White 65 was a good continuation after White 62.];B[pk];W[ri]LB[ri:68][qj:66][pk:67][rk:62][ql:64][rl:63][rm:65][rn:B][rs:A]TR[ro][pp][qp][rq][sr]C[Attaching at White 62 was a brilliant idea. Black 63 and Black 65 were inevitable, and White made a nice and flexible shape on the right side with White 66 and White 68. It's very hard to conceive of this sort of sacrifice during a game. White's marked stones aren't captured yet, because there's ko aji if White plays at either A or B.](;B[qo]LB[ri:68][pk:67][qo:69]C[Black exchanged the atari at Black 69 to settle the position as best he could. However, there was no way for him to erase all the aji here with one more move.];W[rp];B[rg](;W[pc]LB[pc:72][rg:71][rn:B][qo:69][rp:70][rs:A]TR[ri][qj][rk]C[Black 71 was the proper move to attack the marked stones and it looked like Black was in the lead. However, the game was already favorable for White, because of the bad aji at A and B.White 72 was a probe. White wanted to see where Black would answer now.](;B[qd]LB[pc:72][qd:73]C[Calmly extending to Black 73 was the best response for Black. There's no bad aji in the corner now.];W[qc];B[rd];W[nb];B[rb];W[mf](;B[ka]LB[ka:79][nb:76][rb:77][qc:74][rd:75][mf:78]C[White probed further with White 74 and White 76, and Black's responses were accurate. White 78 aimed to exploit the aji in the corner and the timing of Black 79 was interesting.];W[ic];B[nf];W[ng];B[mg];W[lf];B[of](;W[ch]LB[ka:79][ma:A][ic:80][lf:84][mf:78][nf:81][of:85][mg:83][ng:82][ch:86]C[White 80 was necessary, but I'm not sure whether the exchange of Black 79 for White 80 was good for Black. That's because White's position at the top became even more powerful after White 80, and White also gained some more ko threats around A.Lee chose to gain four points with Black 79 in the actual game, because he was behind. Invading at 86 became very powerful, because of White's strong influence at the top of the board. It was hard for Black to answer.];B[sq];W[sp];B[rs](;W[ni]LB[ch:A][ni:90][rn:B][mp:C][sp:88][sq:87][rs:89]C[Black couldn't find a good response to A, so he came back to the lower right corner with Black 87 and Black 89. Lee must have felt that it was too hard for Black to fight properly on the left side if the bad ko aji remained in the corner.However, because Black had to come back to the corner like this, we can conclude that the game wasn't good for him. We can also infer that Black's attachment at C was a questionable move, as a corollary.White 90 showed Gu Li’s delicate sense of play. This jump was a great move to reduce Black's right side influence, and it also maintained Black's potential to play at B later.](;B[eh]LB[eh:91][ni:90]C[This knight's move was questionable.](;W[cj]LB[dg:A][eh:91][cj:92]C[Attaching at White 92 was more active than moving out at A.];B[ck];W[dk](;B[ek]LB[cj:92][ck:93][dk:94][ek:95]C[The combination of White 92 and White 94 was a powerful counter-attack. It's hard for Black to fight properly here, because White's position at the top is so powerful.];W[dl](;B[ej]LB[ej:97][ck:A][dl:96]C[Since Black couldn't fight properly in this position, Lee simply gave up his stone at A, with Black 97.];W[bk];B[ci];W[bj](;B[oi]LB[bi:C][ci:99][oi:01][bj:00][ej:97][bk:98][ck:A][cl:B]C[The result up to 100 was satisfactory for White. If White had captured Black A with White B, Black would have been able to make good shape with C. Therefore, the solid connection at White 100 was the right move in this situation.];W[el](;B[cp]LB[oi:01][el:02][cn:A][cp:03]C[Lee took sente and returned to attacking White on the right side with Black 101, but it didn't bother Gu. Turning at White 102 was thick and nice, and White was clearly leading now. The result up to here was very successful for White.Black had to put his stone at A into motion, with Black 103, before White played another move in the lower left and swallowed A whole.];W[cq];B[bq](;W[bp]LB[bp:06][cp:03][bq:05][cq:04]C[Black 103 and Black 105 were typical of Lee's style of play, but cutting at White 106 was a strong move in this case.];B[co];W[br];B[dq];W[cr](;B[lo]LB[co:07][lo:11][bp:06][dq:09][br:08][cr:10]C[Gu Li specializes in attacking, and Lee Sedol is very good at managing difficult situations like this. The game was becoming more interesting and exciting, because this fight was shaping up to display the strong points of both players.](;W[jq]LB[lo:11][jq:12]C[Black 111 was very subtly timed and Gu fell back with 112, which was a bit passive, but solid. Gu must have felt that the game was already good for him, so he played solidly and safely here.];B[fl];W[fm];B[em](;W[cl]LB[cl:16][fl:13][em:15][fm:14]C[Black 113 and Black 115 were unexpected. It's not easy to think about cutting here and fighting, because White's position is already quite strong. Lee specializes in this sort of close fighting within his opponent's area.White 116 was slack, and Lee started to make the game complicated afterwards. Gu played very cautiously here, because he was in the lead, but it was a bit too passive.];B[fp](;W[gl]LB[gl:18][fp:17]C[Black 117 was a tricky move to answer. The atari in the center, with White 118, was the correct response.];B[fk];W[fn];B[ep];W[do](;B[io]LB[fk:19][cl:B][fn:20][do:22][io:23][ep:21][jq:A]C[White 120 was necessary, and Black 123 was a brilliant multi-purpose move. The game became very complicated after Black played here.Gu tried to simplify the game with A and B, but, ironically, those moves made the game more complicated. They also gave Lee a chance to do something like this inside White's sphere of influence.];W[hp];B[jo](;W[ko]LB[en:A][jo:25][ko:26][hp:24]C[White 124 was another questionable move. White should have played at A instead. Wedging with White 126 was necessary, but the game was already becoming messy and it wasn't clear whether White was still in the lead.];B[kn];W[kp];B[en];W[eq];B[go](;W[ho]LB[en:29][kn:27][go:31][ho:32][jo:25][ko:26][kp:28][eq:30]C[Black 125, Black 129 and Black 131 were a nice combination, and the game suddenly became even. The way Lee made the game playable again seemed magical.You can compare at the situation at moves 114 and 131, then you'll easily notice the difference. Only Lee Sedol pull off this kind of magical reversal against Gu Li.];B[hn];W[gm](;B[im]LB[gm:34][im:35][hn:33][ho:32]C[White 132 and White 134 show the correct move order in this situation, but the mood of the game had already changed. Black was in a good mood now, because the result up to here was very successful for Black. In addition, Gu Li was now under some psychological pressure, because he's historically lost many 'winning games' against Lee Sedol in the endgame.However, Black's tiger's mouth at Black 135 was questionable...];W[gk];B[bi];W[eo];B[fo];W[dr];B[dn];W[dq];B[bm];W[bl];B[gj](;W[hj]LB[bi:37][gj:45][hj:46][gk:36][bl:44][bm:43][im:35][dn:41][eo:38][fo:39][dq:42][dr:40]C[We can now see that, compared to the previous variations, Black 135 was a mistake. Black should have just played at Black 137 immediately, instead of Black 135. The push at White 136 and the hane at White 146 were nice and strong moves. It looks like Lee didn't expect this hane at White 146.](;B[ip]LB[hj:46][im:A][ip:47]C[This push at Black 147 was a careless mistake, and it became the losing move. It looks like Lee was too tired to maintain his concentration at this stage and he played another careless move here, after his earlier mistake at A.](;W[gn]LB[gn:48][ip:47]C[Cutting at White 148 was the right response for White, and all the bad aji was gone.];B[iq];W[ir];B[hq];W[gp](;B[lm]LB[lm:53][gp:52][hq:51][iq:49][ir:50]C[Black was able to reduce White's territory at the with Black 149 and Black 151, but it wasn't big enough. Black 153 became necessary now, so White could even take sente.];W[rn];B[qn];W[sn];B[os];W[pi];B[qh];W[oh](;B[oj]LB[oh:60][qh:59][pi:58][oj:61][qn:55][rn:54][sn:56][os:57]C[White 154 and White 156 were well timed moves, and Black played Black 157 to capture White's lower right stones without a ko fight or a seki. Black 159 and Black 161 were strong, insistent moves.If Black can't capture this group now, the game will be hopeless for him, so he has to play severely here with moves like Black 159. ];W[bh];B[ai];W[dg];B[gi](;W[ih]LB[dg:64][gg:B][bh:62][ih:66][ph:A][ai:63][gi:65]C[Gu didn't keep playing on the right side, but came back to White 162 to attack this Black group first. This was a very good idea and Lee Sedol was still in trouble. White 166 was gentle and nice. It made miai of A and B for Gu.];B[hh];W[hg];B[ii];W[hi];B[gh];W[ig](;B[ki]LB[fg:B][hg:68][ig:72][gh:71][hh:67][mh:A][ph:C][hi:70][ii:69][ki:73]C[Black 167 was not only played to save Black's left side group, but also to keep the possibility of A alive. White 168 and White 172 were the correct responses, and now B and C were miai for White. Black 173 was very tricky to answer correctly, typical of Lee Sedol.](;W[li]LB[fg:A][ph:B][ki:73][li:74]C[Attaching at 174 was the proper move, and A and B were still miai for White.];B[lh];W[lj](;B[mh]LB[lh:75][mh:77][li:74][lj:76]C[White 174 and White 176 were a nice combination, and the game was nearing its end.](;W[kh]LB[fg:A][kh:78]C[Cutting at White 178 was a big mistake. It looks like Gu wanted to ensure that everything was tidy, before capturing Black's group with A, but this cut become a bad exchange.];B[jh];W[kg];B[nh](;W[ik]LB[kg:80][jh:79][kh:78][nh:81][ik:82]C[Despite making a mistake with White 178, Gu stayed calm and maintained his lead with White 182.];B[fi];W[df](;B[fg]LB[df:84][fg:85][fi:83]C[Black was able to save his group with Black 183, but the game wasn't reversed. Black 185 was questionable and Black didn't get any other chances afterwards.];W[di];B[dh];W[ce];B[kk];W[kj];B[jj];W[ji];B[bo];W[aq];B[ki];W[rc];B[sc];W[ji];B[aj];W[ah];B[ei];W[an];B[ki](;W[ij]LB[rc:96][sc:97][ce:88][ah:00][dh:87][di:86][ei:01][ji:98][ki:03][aj:99][ij:04][jj:91][kj:90][kk:89][an:02][bo:93][aq:94]C[The atari at White 204 was the right move.];B[hr];W[hs];B[fe];W[ml];B[mk](;W[nk]LB[fe:07][mk:09][nk:10][ml:08][hr:05][hs:06]C[The knight's move at White 208 and the jump at Black 207 were miai. White's hane at White 210 was a nice tesuji, and the stone at White 208 was connected. Gu Li's endgame in this game was flawless.](;B[gs]LB[mk:09][nk:10][ml:08][gs:11]C[Black couldn't capture White 208, so he came back and played Black 211.];W[is];B[gd];W[gc];B[nl];W[lk];B[mm];W[ok](;B[ol]LB[gc:14][gd:13][lk:16][ok:18][nl:15][ol:19][mm:17][is:12]C[White 218 was the nice endgame tesuji by Gu and Black 219 was the best response.];W[nj];B[pj];W[ll]LB[kd:A][me:B][eh:F][nj:20][pj:21][ok:18][rk:E][el:G][ll:22][ol:19][im:H][qo:D][ip:I][mp:C]C[Black resigned here.White earned some extra points with White 218 and was winning by about 5 points on the board at this stage.This game was very interesting right from the beginning. The first fight began when Black played at A and the result up to Black B was slightly favorable for White. Black 's attachment at C was very interesting, but it should have been at D instead. In the sequence after Black C, White E was a brilliant idea and the game became good for White.Black F was questionable, and White established a winning position up to G. Lee tried very hard to reduce White's lower left corner area afterwards, and Gu played too cautiously. This gave Lee a good chance to catch up again.However, Black H was big mistake and the game became hard for Black again after that. Black's move at I was a careless mistake and it became the losing move. Finishing the game still wasn't easy after that, but Gu was able to carry his winning position to the end and he didn't give Lee any more chances after Black I.Gu Li has started to catch up in the series and the score is now 2-1 in Lee's favor. This would have become a very hard jubango for Gu if he'd lost this game too.Gu Li won three games in a row against Lee Sedol in seven days, which was an excellent result for Gu. This must have restored his confidence, and the pressure of the jubango should also have reduced now, because he's won his first game.On the other hand, Lee would have suffered some psychological damage after losing three games in a row, but the next game of the jubango will be played about a month later. Therefore, Lee has enough time to recover from the damage and clear his mind, so he can concentrate properly during the next game.Lee Sedol said that the match schedule this year is too tight for him, with too many tournaments, and Gu Li probably feels the same. We can see some careless moves in this game, which you rarely ever see in Lee Sedol and Gu Li's games. That's because both players were already tired after playing in other important matches shortly before this game. They didn't have enough time to recover properly before this game.The next game will be played in Korea, and the atmosphere will be different. I don't know who will have the advantage based on the venue, but it won't matter much in terms of the overall match, because most of the games will be in China. Both players should be in better shape for the next game, and I hope that it will be even more interesting.The MLily Gu vs Lee Jubango is getting more exciting now that the players have finished warming up. I hope you'll be able to understand this game better with this commentary, and that you'll also feel the profound reading and sense of play of these great players.This commentary will be expanded upon and will become part of our upcoming book on Lee Sedol and Gu Li's jubango: http://gogameguru.com/lee-sedol-vs-gu-li-go-book/You can regard this version of the commentary as our first draft. If you have any questions, comments or corrections (even if they're minor typos), please feel free to leave a comment. Your questions and comments will help us to create the best book we possibly can.Thanks,Commented by Younggil An 8p http://gogameguru.com/])(;B[nj];W[mj];B[pj];W[mi];B[og];W[ol];B[ph];W[nm];B[nn];W[kl]LB[og:5][ph:7][mi:4][mj:2][nj:1][pj:3][kl:10][ol:6][nm:8][nn:9]C[If Black ataris at Black 1, White 2 and 4 are sente, and it would be a disaster for Black up to White 10.]))(;B[lk];W[nj];B[nl];W[mi];B[og];W[ol];B[nm];W[ok];B[ph];W[pj]LB[og:5][oh:C][ph:9][mi:4][nj:2][pj:10][lk:1][ok:8][ml:A][nl:3][ol:6][nm:7][pm:B]C[If Black tries to capture White A, White can respond with White 2 to White 8. Black can't connect with Black 9 at 10, because he's short of liberties. After White double ataris at White 10, his right side stones have been rescued and the game is over, because B and C are miai.]))(;W[lk];B[ll];W[mi];B[og]LB[og:4][mi:3][nj:C][lk:1][nk:B][ll:2][ml:A]C[White should be careful not to push at White 1 first. White can't save the stone at A now, because if he plays B, Black will threaten a snapback with C.]))(;W[jk];B[lk];W[mi];B[og];W[ij];B[nj];W[ji]LB[fe:A][og:4][ji:7][mi:3][ij:5][nj:6][jk:1][lk:2]C[If White cuts at White 1 instead, Black can block with Black 2 and Black 6 in sente. Black will jump at A next, and the game will become quite close.]))(;B[di];W[ce];B[bo];W[aq](;B[an];W[al](;B[ap];W[bq];B[aj]LB[cc:B][ce:2][fg:A][di:1][aj:9][al:6][an:5][bo:3][ap:7][aq:4][bq:8]C[Black should have lived with Black 1, instead of A. Reinforcing at White 2 is necessary, to erase bad aji at B, and Black can create a one step ko on the left side like this.It's still very difficult for Black to catch up at this stage, but he might have had a chance with this variation and it's better than nothing.])(;B[aj];W[ap];B[cm];W[ao];B[ak];W[am]LB[ce:2][di:1][aj:7][ak:11][al:6][am:12][cm:9][an:5][ao:10][bo:3][ap:8][aq:4]C[If Black just plays at Black 7 immediately, White can play at White 8 to avoid the ko. Black's stones are captured in a 'one eye vs no eye' capturing race.]))(;B[al];W[an];B[am];W[ao]LB[ce:2][di:1][al:5][am:7][an:6][ao:8][bo:3][aq:4]C[The hane at Black 5 doesn't work for Black either, because White 2 is the vital point and Black will lose another 'one eye vs no eye' capturing race.])))(;W[fg];B[hk];W[ij];B[jj];W[ik];B[jk];W[il];B[jl];W[hl];B[cd];W[cc];B[de];W[bd];B[be]LB[cc:11][bd:13][cd:10][be:14][de:12][fg:1][ji:A][ij:3][jj:4][hk:2][ik:5][jk:6][hl:9][il:7][jl:8]TR[li][ni][lj]C[If White plays at White 1, to capture Black's group, cutting at Black 2 is the beginning of a nice counter. Up to White 9, Black's managed to capture White's marked stones in sente. After this Black can return to the left side and create a ko with with Black 10 to Black 14. White might still be winning, but the game's become quite complicated.Note: In an actual game, White would take the ko at A before continuing with 5,7 and 9, in order to make Black use some ko threats. Those moves are only omitted here to make the overall strategy clearer.]))(;W[fg];B[eg];W[df];B[ef];W[ee];B[hk];W[ij];B[ji];W[jj];B[kj];W[il]LB[ee:5][df:3][ef:4][eg:2][fg:1][ji:8][ij:7][jj:9][kj:10][hk:6][il:11]C[Gu would have won the game easily with White 1. Black can't make two eyes, and cutting at 6 doesn't work either. ]))(;B[hk];W[ij];B[ji];W[jk];B[kk];W[hl];B[fg];W[ph];B[mh];W[nh];B[kh];W[kj];B[jj];W[ik];B[mi];W[mj];B[nj];W[mk];B[lk];W[ml]LB[fg:7][kh:11][mh:9][nh:10][ph:8][ji:3][mi:15][ij:2][jj:13][kj:12][mj:16][nj:17][hk:1][ik:14][jk:4][kk:5][lk:19][mk:18][hl:6][ml:20]C[If Black cuts at Black 1 first, White 4 is a good move and 7 and 8 are still miai for White. White can get enough liberties to win the capturing race, so Black collapses.])(;B[fg];W[ph];B[mh];W[nh];B[kh];W[kj];B[jj];W[ij];B[ji];W[jk];B[kk];W[ik];B[mi];W[mj];B[nj];W[mk];B[ml];W[kl]LB[fg:1][kh:5][mh:3][nh:4][ph:2][ji:9][mi:13][ij:8][jj:7][kj:6][mj:14][nj:15][ik:12][jk:10][kk:11][mk:16][kl:18][ml:17]C[If Black reinforces at Black 1 now, White can still connect at 2. As you can see from these variations, there's no way for Black to win this capturing race.]))(;W[fg];B[hk];W[ij];B[ji];W[ik];B[hl];W[il];B[hm];W[jm];B[in]LB[fg:1][ji:4][ij:3][hk:2][ik:5][hl:6][il:7][hm:8][jm:9][in:10]C[If White doesn't defend in the center, and tries to kill Black's group with White 1, Black can cut at Black 2 and White's center stones will be in danger.]))(;B[fi];W[ph];B[mh];W[mi];B[nh];W[og];B[lh];W[li];B[kh];W[ki]LB[og:6][kh:9][lh:7][mh:3][nh:5][ph:2][fi:1][ki:10][li:8][mi:4]C[If Black reinforces his left side group with Black 1, White can save his right side stones with White 2. Black 3 doesn't work anymore and the game will be over here.]))(;W[ph];B[mh];W[nh];B[li];W[lj];B[kj];W[mi];B[kh];W[lh];B[lg]LB[lg:10][kh:8][lh:9][mh:2][nh:3][ph:1][li:4][mi:7][kj:6][lj:5]C[If White tries to save his right side stones with White 1, Black can try to capture all of them with Black 2 and Black 4.];W[kg];B[lh];W[jh];B[ki];W[kk];B[lk];W[mj];B[jk];W[kl];B[jj];W[jl];B[il];W[ik];B[jg];W[kf];B[ih]LB[kf:15][jg:14][kg:1][ih:16][jh:3][lh:2][ki:4][jj:10][mj:7][ik:13][jk:8][kk:5][lk:6][il:12][jl:11][kl:9]C[It's a long sequence, but Black manages to save his stones through to Black 16. All of White's stones on the right side will be captured.]))(;B[pm];W[bh]LB[bh:2][oj:A][pm:1]TR[rn][sn][ro][pp][qp][rp][sp][rq][sr]C[Playing at Black 1 is a safe way to capture the marked White stones. However, Black can't win the game with this. White will attack Black's left side group with White 2 now, before coming back to A later.]))(;B[nh];W[ln];B[mn];W[lm];B[km];W[mm];B[nn];W[lk]LB[nh:1][lk:8][km:5][lm:4][mm:6][ln:2][mn:3][nn:7]C[If Black doesn't reinforce at Black 153 in the game, White will cut at White 2 and it will be hard for Black to manage his group at the bottom.]))(;W[hq];B[hk];W[gi];B[fj];W[gn];B[nh]LB[nh:4][hk:2][gn:3][ip:A][hq:1]C[This was Lee's plan when he played Black A. Black's managed to reduce White's territory by two more points with A with in this diagram. However, this one-sided reading was too optimistic.]))(;B[hk];W[gi];B[fj];W[gn];B[nh]LB[bh:A][nh:5][gi:2][fj:3][hk:1][im:C][gn:4][ln:B]C[Black should have cut at Black 1, then Black still could have come back and played Black 5. However, the game's already good for White again, because there are weaknesses in Black's position at A and B. In conclusion, we can see from this that Black C was a big mistake.]))(;W[ik];B[hj];W[il];B[lm]LB[gj:A][hj:2][ik:1][il:3][lm:4]C[Lee might have expected White to jump out with White 1. Then Black can maintain good shape on the left side. Gu played several of passive moves in the bottom left, but he played strongly here with the hane at 2 (White 146 in the game). The mood of the game changed once again.]))(;B[bi];W[eo];B[fo];W[dr];B[dn];W[dq];B[bm];W[bl];B[gk](;W[im];B[il];W[hm];B[jm];W[gp];B[nh]LB[nh:15][bi:1][gk:9][bl:8][il:11][bm:7][hm:12][im:10][jm:13][dn:5][eo:2][fo:3][dq:6][eq:14][dr:4]C[Black must play at Black 1 first. If White plays the same moves as in the actual game, pushing back with Black 9 is good. As you can see, Black's able to seal off the center in sente, while also erasing the aji on the right side. This result is obviously good for Black.])(;W[il];B[kl];W[jn];B[km];W[im];B[ef]LB[ef:6][bh:A][il:1][kl:2][im:5][km:4][jn:3]C[Jumping at White 1 is the right move for White, but the game's still playable for Black. Jumping to Black 6 is very good, and A doesn't work for White anymore.])))(;W[gm];B[ho];W[eo];B[fo];W[dr];B[dn];W[dq];B[ik];W[im];B[jm]LB[ik:8][gm:1][im:9][jm:10][dn:6][eo:3][fo:4][ho:2][dq:7][dr:5]C[Connecting at White 1 without pushing at 2 first is wrong. Black 8 is a good move, to seal White in, and the result up to Black 10 is very good for Black. White will be forced to remove Black's lower left group in a capturing race later on and will lose points, while Black becomes thick, as a result.]))(;W[ho];B[kp];W[hm];B[bi]LB[bi:4][bm:A][hm:3][ho:1][kp:2]C[If White pushes up at White 1, capturing with Black 2 is big and sente. Reinforcing with White 3 is necessary and the game would be quite close through to Black 4. There's still some possible bad aji on the left side if Black plays at A later on.]))(;B[en];W[eq];B[eo];W[go];B[gp];W[ho]LB[en:1][eo:3][go:4][ho:6][gp:5][eq:2]C[If Black tries to save all his stones with Black 1, White will counter with White 4 and White 6. Now all of Black stones will be captured.]))(;W[ep]C[Black 117 was ];B[eo](;W[eq];B[gm];W[fn];B[gn];W[gl];B[fk];W[fo];B[gp];W[en];B[go];W[do];B[hl]LB[hj:C][fk:8][gk:B][gl:7][hl:14][gm:4][en:11][fn:5][gn:6][do:13][eo:2][fo:9][go:12][ep:1][fp:A][gp:10][eq:3]C[White shouldn't answer A directly. If White answers at White 1, Black has the hane at Black 2 up his sleeve and the result up to Black 14 is a great success for Black. White can't save his stone from atari with B, because Black can make a net with C.])(;W[fo];B[fn];W[gm];B[go];W[eq];B[io]LB[gm:5][fn:4][eo:2][fo:3][go:6][io:8][ep:1][eq:7]C[In this sequence, cutting at White 3 doesn't work very well either. Black can double atari with Black 4 and run away like this. There's nothing for White to gain here after Black 8.])))(;W[dm];B[en];W[gl];B[fk];W[dh]LB[dh:5][fk:4][fl:A][gl:3][dm:1][em:B][en:2]C[White should have ataried at White 1. If Black extends at Black 2, White can even play at White 5 to attack the left side group. Black has two weak groups, and it doesn't look like it's possible for Black to manage both of them.]))(;W[kp];B[ep];W[en];B[fp];W[do];B[gq];W[eq];B[iq];W[jq];B[ho]LB[en:3][do:5][ho:10][ep:2][fp:4][kp:1][eq:7][gq:6][iq:8][jq:9]C[There was nothing wrong with playing White 1, but Gu might have been worried that peeping at Black 8 would be sente, which could Black to move out in this case.]))(;B[ep];W[en];B[fp];W[do]LB[en:2][do:4][ep:1][fp:3]TR[cn][co][cp]C[If Black ataris at Black 1, White 2 is the vital point. If Black tries to manage the situation with Black 3, White will be happy to capture the marked stones without any trouble.]))(;W[co];B[bp];W[do];B[dq];W[cr];B[dr];W[br];B[ar];W[bo];B[cs]LB[bo:9][co:1][do:3][bp:2][dq:4][ar:8][br:7][cr:5][dr:6][cs:10]C[White 1 and White 3 are more common, but they're not good in this situation. Black will live in the corner with more points than if he'd just invaded at 3-3. This is unsatisfactory for White.]))(;B[cq];W[cp];B[bp];W[bo];B[bq];W[co];B[er];W[fr];B[eq];W[ep];B[dq];W[dh]LB[dh:12][bo:4][co:6][bp:3][cp:2][ep:10][bq:5][cq:1][dq:11][eq:9][er:7][fr:8]C[Black can easily live in the corner with the 3-3 invasion of Black 1, but White will counter with White 12, which is annoying for Black.])(;B[bi];W[cp];B[en];W[fm]LB[bi:1][fm:4][cn:A][en:3][cp:2]C[If Black tenukis, for example to play the big move at Black 1, Black A is practically dead after White reinforces the corner with White 2. Even if Black tries to run away with Black 3, White can easily cut off his escape with White 4 and Black won't be able to save his group, because White's too thick at the bottom.]))(;B[bi];W[el]LB[bh:A][bi:1][el:2]C[If Black plays at Black 1, White will still push up at White 2. It will still be annoying for Black if White plays at A later, so Lee didn't play at 1 in the game.]))(;B[cl];W[dm];B[cm];W[dg];B[ej];W[bj];B[en];W[dn];B[do];W[eo];B[co];W[em];B[fn];W[fm];B[gm];W[gn];B[fo];W[gl];B[hm];W[fl];B[ep];W[hl]LB[dg:4][bj:6][ej:5][ek:A][cl:1][dl:B][fl:20][gl:18][hl:22][cm:3][dm:2][em:12][fm:14][gm:15][hm:19][dn:8][en:7][fn:13][gn:16][co:11][do:9][eo:10][fo:17][ep:21]C[If Black tries to fight with Black 1 (after exchanging A for B), White will play at White 2 and White 4. Black 5 and Black 7 start a good counter-attack, but the result up to White 22 is still favorable for White, because it's hard for Black to manage his center stones now.]))(;B[ej];W[cl];B[bk];W[bl];B[bj];W[ci];B[dl];W[ek];B[cm];W[el];B[dm];W[dg]LB[dg:12][ci:6][bj:5][ej:1][bk:3][ek:8][bl:4][cl:2][dl:7][el:10][cm:9][dm:11]C[If Black extends at Black 1, and tries to fight, White 2 and White 4 are good moves. Even though Black can capture those two stones, White can move out at 12, and Black's in trouble.])(;B[cl];W[di];B[ej];W[ei];B[fi];W[fj];B[ek];W[fh];B[gi];W[gh];B[hi];W[eg]LB[eg:12][fh:8][gh:10][di:2][ei:4][fi:5][gi:9][hi:11][ej:3][fj:6][ek:7][cl:1]C[If Black extends at Black 1, White will play the moves through to White 12, and the result is still good for White.]))(;W[dg];B[ci];W[dh];B[di];W[df];B[en];W[co];B[bn]LB[df:5][dg:1][dh:3][ci:2][di:4][bn:8][en:6][co:7]C[Lee might have expected white to move out with White 1. In that case, Black can reinforce his position with Black 2 and Black 4. The result through to Black 8 is satisfactory for Black, but Gu didn't follow Black's plan.]))(;B[oi];W[rn];B[qn];W[sn];B[os];W[pi];B[pm];W[oh]LB[oh:8][oi:1][pi:6][sl:A][pm:7][qn:3][rn:2][sn:4][os:5]C[If Black attaches at Black 1, to cut off White's group, White will play White 2 to White 8. White 6 is a good move, which makes miai of A and White 8 for White.])(;B[dh];W[di](;B[ci];W[ei](;B[bh];W[cj];B[cg];W[bi]LB[ne:C][cg:7][bh:5][dh:1][bi:8][ci:3][di:2][ei:4][cj:6][ck:A][rn:B]C[If Black attaches at Black 1, White will wedge with White 2 and this variation can be expected. It's hard for Black to start a ko with A, because White has more ko threats around B and C. Lee didn't seem to like this variation, so he played differently.];B[ch];W[dk];B[bj];W[ej];B[bk];W[rn];B[qn];W[sn]LB[ch:9][bj:11][dj:A][ej:12][bk:13][dk:10][qn:15][rn:14][sn:16]C[If Black just connects at Black 9, White will capture the stone at A in sente, before returning to the right side with White 14. This result is still favorable for White.])(;B[eh];W[cg];B[dg];W[bf];B[ce];W[bi];B[cj];W[bj];B[cl];W[fi]LB[ce:9][bf:8][cg:6][dg:7][dh:1][eh:5][bi:10][ci:3][di:2][ei:4][fi:14][bj:12][cj:11][cl:13]C[If Black pushes up with Black 5, White can play White 6 and White 8 in this situation. That's because White's cutting stones (2 and 4) can't be captured in ladder.Up to White 14, it's very hard for Black to fight properly, because his groups are too weak and White's position at the top is very powerful.])(;B[ej];W[dg];B[eh];W[fi];B[cg];W[bh]LB[cg:9][dg:6][eg:A][bh:10][dh:1][eh:7][ci:3][di:2][ei:4][fi:8][cj:B][ej:5]C[If Black pushes up with Black 5, White can atari at White 6. Cutting at Black 9 doesn't work well, because A and B are miai for White.]))(;B[ei];W[ci];B[dg];W[cj];B[dk];W[cl]LB[dg:5][dh:1][eh:A][ci:4][di:2][ei:3][cj:6][dk:7][cl:8]C[Playing atari at Black 3 isn't good either. White can live pretty easily up to White 8, and the cutting point at A is a serious problem for Black.]))(;B[cj];W[ce];B[cp];W[cq];B[bq];W[co];B[bp];W[do];B[bo];W[dn];B[dm];W[em];B[dl]LB[ce:2][cj:1][dl:13][dm:11][em:12][dn:10][bo:9][co:6][do:8][bp:7][cp:3][bq:5][cq:4]C[Creating an iron pillar at Black 1 would have been the best for Black in this case. White will kick at 2, and Black can create territory with Black 3 and Black 5.Up to Black 13, the game's still slightly more favorable for White, but it's a close game.]))(;W[rn];B[qn];W[sn](;B[pm];W[os];B[sm];W[ms];B[ss];W[ns]LB[pm:4][sm:6][qn:2][rn:1][sn:3][sq:A][ms:7][ns:9][os:5][rs:B][ss:8]C[Even though Lee reinforced the corner with A and B, there's still some bad aji there. Black 4 is necessary, in order to stop White from connecting under, and White can create a seki in the corner with White 5 and White 7. If Black tries to capture White's group with Black 8, White can start a ko with White 9 later on, which is a heavy burden for Black.])(;B[os];W[sl];B[pm];W[sm];B[pi];W[qi];B[sj];W[sk];B[si];W[rh];B[sh];W[qg];B[rf];W[sg];B[sf]LB[rf:13][sf:15][qg:12][sg:14][rh:10][sh:11][pi:5][qi:6][si:9][sj:7][sk:8][sl:2][pm:3][sm:4][os:1]C[If Black lives at a to avoid the seki or the ko fight in the corner, White can connect under with 2 and 4. If Black keeps trying to kill White with Black 5 and Black 7... ];W[pj];B[oj];W[oi];B[ph];W[pg];B[oh];W[og](;B[nh];W[mh];B[ni];W[qh];B[lg];W[mi];B[mj];W[kh]LB[lg:12][og:7][pg:5][kh:15][mh:9][nh:8][oh:6][ph:4][qh:11][mi:13][ni:10][oi:3][mj:14][oj:2][pj:1]C[Cutting at 3 is a good tesuji, and it's very hard for Black to keep going. Eventually, White would save the whole group with capturing the two stones in net.])(;B[mh];W[nh];B[ni];W[qh];B[oi];W[mi]LB[mh:1][nh:2][qh:4][mi:6][ni:3][oi:5]C[If Black extends at 1, White can cut at 6, and Black is rather in deep trouble. ])))(;W[eh];B[nh];W[rn];B[qn];W[sn];B[os];W[sl];B[pm];W[sm];B[pi];W[qi];B[sj]LB[eh:1][nh:2][ni:A][pi:10][qi:11][sj:12][sl:7][pm:8][sm:9][qn:4][rn:3][sn:5][os:6]C[If White doesn't play at A (White 90 in the actual game), Black will atari at Black 2 immediately. If White still tries to mobilize his corner group with White 3 and White 5, Black can now calmly play at Black 6. Up to Black 12, White's group is dead, because of Black's stone at Black 2.])(;W[nh];B[ni];W[mi];B[oh];W[mh]LB[mh:5][nh:1][oh:4][mi:3][ni:2]TR[ri][qj][rk]C[If White simply extends at White 1, instead of White 90 in the actual game, Black's attachment at Black 2 is very nice. If White hanes at White 3, Black will counter-hane at Black 4. White's marked stones have practically been captured in sente. That's why jumping to White 90 in the actual game was a nice and flexible move.]))(;W[nh];B[ef];W[ce];B[bf]LB[ce:3][bf:4][ef:2][nh:1]C[If White extends with White 1, jumping to Black 2 becomes a very nice move and White misses his chance to invade.]))(;B[nf];W[ng];B[mg];W[lf];B[of]LB[ka:A][lf:4][nf:1][of:5][mg:3][ng:2]C[Simply answering with Black 1 to Black 5 would be normal, but Lee didn't want White to be able to capture at A in sente later.]))(;B[qc];W[od];B[pe];W[qb](;B[rc]LB[nb:B][ob:C][qb:4][qc:1][rc:5][od:2][pe:3][nf:A]C[If Black answers at Black 1, White will play White 2 and White 4 and there's some bad aji after moves like A-C later. Black's responses in the actual game were better.])(;B[pb];W[ob]LB[ob:6][pb:5]C[If Black cuts at Black 5, White can start a ko with White 6, which is a serious problem for Black.])))(;W[rs];B[ss];W[lo];B[nn];W[rs];B[jq];W[iq];B[ss];W[rn];B[qn];W[rs];B[jr];W[ir];B[ss];W[sl];B[pm];W[rs];B[ks];W[kp];B[ss]LB[js:A][rs:1]C[Starting a ko fight immediately, with White 1, would be premature. White's short of ko threats and Black still has one more ko threat at A.])(;W[rn];B[sk];W[sj];B[rj];W[lo];B[nn];W[rk];B[jq];W[iq];B[rj];W[rs];B[si];W[qr];B[cd];W[ps];B[de]LB[de:16][si:12][rj:4][sj:3][sk:2][rn:1][rs:11]C[White can also think about White 1 and White 3, which leads to a complicated ko fight. White 11 is a good move, creating a double ko, and Black needs to eliminate the other ko with Black 12.Eventually, White will win the ko, but Black will be able to play two moves in a row in compensation. The result up to here is playable for Black, who can settle the right side with Black 12 and reduce his thinness on the left with Black 16. This means that it's too early to start a ko with White 1. ]))(;B[sk];W[sj];B[rj];W[di];B[si];W[cj]LB[di:4][si:5][cj:6][rj:3][sj:2][sk:1][rs:A]C[If Black ataris at Black 1, White will start a ko with White 2. Even though Black can win the ko with Black 5, White's aji in the corner is still troublesome. White can still start a ko with A later on, so it's no good for Black.]))(;W[qn];B[pm];W[qo];B[rj];W[pk];B[qj];W[nn];B[mn];W[nm];B[ok];W[mm];B[ko];W[kn];B[kp];W[jo];B[jq];W[iq];B[jr];W[ir];B[ks]LB[qj:6][rj:4][ok:10][pk:5][mm:11][nm:9][pm:2][kn:13][mn:8][nn:7][qn:1][jo:15][ko:12][qo:3][kp:14][iq:17][jq:16][ir:19][jr:18][ks:20]C[Extending at White 1 isn't possible for White. Black 2 and Black 8 are good moves and, if White continues fighting up with the sequence up to White 19, he finds himself in quite a bit of danger.]))(;B[rj];W[pk];B[qj];W[rm];B[sk];W[ol];B[pm];W[nn];B[mn];W[nm];B[ok];W[mm]LB[pj:A][qj:3][rj:1][ok:11][pk:2][sk:5][ol:6][mm:12][nm:10][pm:7][rm:4][ln:B][mn:9][nn:8]C[If Black ataris at Black 1, instead of playing Black 65 in actual the game, White can play White 2 to White 12. White 6 and White 8 are a good combination and Black's in deep trouble now, because A and B are miai for White.]))(;B[rj];W[rl];B[qj];W[qo];B[os];W[ch]LB[ch:6][qj:3][rj:1][rl:2][qo:4][os:5]C[If Black falls back with Black 1, White can live in sente and can even invade the left side. It's no good for Black.])(;B[jq];W[iq];B[jr];W[ir];B[kp];W[lo]LB[mn:A][ko:B][lo:6][kp:5][iq:2][jq:1][ir:4][jr:3][js:C]C[Some readers might be wondering whether Black can save his stones at the bottom with Black 1. However, White can hold Black in with White 2 and White 4. Because White 6 is sente (threatening to capture Black's crucial cutting stones at A), there's effectively no way for Black to escape. After White 6, A and B are miai for White.Instead of Black 5, if Black tries to gain more liberties by descending to C, White can simply fill Black's liberties from the outside, starting at 5. White will win the capturing race by one liberty.]))(;W[rl];B[qo];W[rp];B[rn];W[qn];B[sn];W[rm];B[rk]LB[rk:8][rl:1][rm:7][qn:5][rn:4][sn:6][qo:2][rp:3]C[If White plays White 1, Black can exchange Black 2 to White 7, before blocking at Black 8 . This leads to a complicated capturing race, but it's more risky for White.])(;W[rs];B[ss]LB[rs:1][ss:2]C[White can start a ko with White 1, but it's too early to do so now. White doesn't have enough ko threats. In addition, it's a two stage ko which favors Black in this case, which means White will need to spend three moves to eliminate the ko.]))(;B[qo];W[rp];B[rn];W[rs];B[qs];W[qr]LB[rn:3][qo:1][rp:2][qr:6][qs:5][rs:4]C[If Black rushes to capture the corner with Black 1 and Black 3, White can make a ko with White 4. It's hard for Black to fight this ko, because it's a two stage ko and White captures first.]))(;B[ns];W[mr];B[qr];W[ps];B[kr];W[pr]LB[kr:5][mr:2][pr:6][qr:3][ns:1][ps:4][qs:A]C[If Black exchanges Black 1 for White 2 and then connects at Black 3, the placement at White 4 is a good tesuji. After White 6, Black can't atari at A because of his shortage of liberties, so Black's in trouble.]))(;B[qr];W[nr];B[qo];W[rp];B[rn];W[qn];B[rm];W[os];B[so];W[sq]LB[rm:7][qn:6][rn:5][qo:3][so:9][rp:4][sq:10][nr:2][qr:1][os:8][qs:C][rs:B][ss:A]C[If Black connects at Black 1, to capture the corner, White will play White 2 to White 10. Black can start a ko fight with A to C, but it's a picnic ko for White. This is a bad result for Black, so Lee didn't play like this.]))(;B[nq];W[or];B[nr];W[qr]LB[nq:1][nr:3][or:2][qr:4]TR[pq][qq]C[Black can't easily sacrifice the two marked stones with Black 1 and Black 3, because Black loses all the corner territory and doesn't gain enough center influence in compensation.  ]))(;B[np];W[pn];B[lq];W[ch]LB[ch:4][qi:A][pn:2][np:1][lq:3]C[Black still can't compromise with Black 1 and Black 3, because once again White will invade at White 4. White will also be able to invade at A later, because his group in the lower right settled.]))(;B[nq];W[on];B[lq];W[ch]LB[ch:4][on:2][lq:3][nq:1]C[If Black compromises with Black 1 and Black 3, White will be happy to take sente and invade the left side at White 4. This is too easy for White.]))(;W[nq];B[qo];W[pm];B[rp];W[om];B[nk]LB[nk:6][om:5][pm:3][qo:2][mp:A][rp:4][nq:1]C[If White answers at White 1, Black will play Black 2 to Black 6 and the stone at A might help Black to attack White's right side group. That was Lee's plan, but Gu had other ideas.])(;W[lq];B[rq];W[pp];B[op](;W[oo];B[on];W[no];B[pn]LB[on:6][pn:8][no:7][oo:5][mp:A][op:4][pp:3][lq:1][oq:B][rq:2]C[Drawing back at White 1 is too calm in this case. As soon as Black takes the vital point at Black 2, White's group becomes weak. Pushing and cutting with White 3 and White 5 doesn't work well because Black can manage the situation up to Black 8.If the exchange of Black A for White 1 weren't on the board, White would be able to capture Black 4 with B now. However, in this case White can't do that, so White's in trouble.])(;W[oq];B[oo]LB[oo:6][qo:B][op:4][pp:3][lq:1][nq:A][oq:5][rq:2]C[Cutting on the other side with White 5 doesn't improve the situation for White. Black 6 makes miai of A and B and Black is fine.])))(;B[pp];W[pm];B[om];W[rk];B[rj];W[rl];B[qj];W[rq]LB[qj:7][rj:5][rk:4][rl:6][om:3][pm:2][qo:B][ro:A][pp:1][rq:8]C[If Black connects at Black 1 now, White can still play the moves up to White 8 to create the shape he planned to earlier. This is better for White than the previous variation (where White played A at B instead).])(;B[qo](;W[rq];B[pp];W[rp];B[rr];W[pm];B[om];W[rk];B[rl];W[ql];B[rm];W[pk];B[qj];W[ol];B[rj]LB[qj:13][rj:15][pk:12][rk:8][ol:14][ql:10][rl:9][om:7][pm:6][rm:11][qo:1][pp:3][rp:4][rq:2][rr:5]C[Lee should have played at Black 1. If White still exchanges the moves up to Black 7 and then attaches at White 8, Black can resist with Black 9 and Black 11. This way, Black can capture White's corner stones, because of his stone at Black 1.])(;W[pm](;B[om];W[rk](;B[rj];W[rl];B[qj];W[rq];B[pp];W[rp]LB[qj:7][rj:5][rk:4][rl:6][om:3][pm:2][qo:1][pp:9][rp:10][rq:8]C[Pushing up at White 2 first is the right move order for White. If Black hanes at Black 3, the attachment at White 4 works again now. White will be happy with this result.])(;B[rl];W[ql];B[rm];W[pk];B[qj];W[ol];B[rj]LB[qj:9][rj:11][pk:8][rk:4][ol:10][ql:6][rl:5][om:3][pm:2][rm:7][qo:1][pp:B][rp:C][rq:A][rr:D]C[If Black still resists with the hane at Black 5, White will sacrifice his stones with the moves up to White 10. This result seems to be playable for White, because White didn't make the bad exchanges of A to D like he did earlier.]))(;B[rp];W[om];B[nk];W[mm]LB[nk:5][mm:6][om:4][pm:2][en:A][qo:1][rp:3]C[Reinforcing at Black 3, instead of playing the hane at 4, is the right move for Black. White will move out into the center with White 4 and White 6, but the result isn't bad for Black. That's because Black will have sente to reinforce the left side around A.]))))(;W[qo];B[pp];W[pm];B[om];W[rk];B[rj];W[rl];B[qj];W[rn];B[en]LB[qj:8][rj:6][rk:5][rl:7][om:4][pm:3][en:10][rn:9][qo:1][pp:2]C[If White just plays White 1, which is normal, Black can take sente and reinforce his position on the left side with Black 10. Gu didn't seem to like this variation, so he played White 36 in the actual game instead. ]))(;B[pp];W[pm];B[om];W[rk];B[rj];W[rl];B[qj];W[rq];B[qq];W[ro]LB[qj:7][rj:5][rk:4][rl:6][om:3][pm:2][ro:10][pp:1][qq:9][rq:8]C[If Black connects at Black 1, White can play the moves through to White 10, and the result is satisfactory for White. You can see that Black's corner becomes weak because of White's hane at White 8.])(;B[qo];W[pp];B[op];W[qq];B[or];W[ro];B[rn];W[rp];B[qn];W[rr]LB[qn:9][rn:7][oo:A][qo:1][ro:6][op:3][pp:2][rp:8][qq:4][or:5][rr:10]C[If Black blocks at Black 1, White will live in the corner like this. The cutting point at A is still annoying for Black, so Lee didn't choose this variation.]))(;B[mc];W[kb];B[nb]LB[kb:2][nb:3][mc:1]C[If Black just pushes down at Black 1, White will extend to White 2. After that, the hane at Black 3 is a good move, and this result would be better for Black than the actual game.])(;B[ld];W[lb]LB[lb:2][ld:1]C[Just connecting at Black 1 is too simple. White can connect under with White 2, and White will be very happy with this.]))(;W[kc];B[lc];W[kb];B[lb];W[ld];B[ke];W[jb];B[md];W[le];B[kf];W[lf];B[mc];W[lg];B[jf];W[ic];B[nd]LB[jb:7][kb:3][lb:4][ic:15][kc:1][lc:2][mc:12][ld:5][md:8][nd:16][ke:6][le:9][me:A][ne:B][jf:14][kf:10][lf:11][lg:13]C[If White cuts at White 1, we can expect this variation and the result is even. Gu might have thought that Black's corner territory was too big though.If White turns at A, instead of playing White 11, Black will double hane at B and the result will be similar to the variation we saw earlier (which was good for Black).])(;W[ic];B[kc];W[ib];B[ke];W[jf];B[oc]LB[ib:3][ic:1][kc:2][nc:A][oc:6][ke:4][jf:5]C[If White counter-hanes at White 1, Black will be happy the result up to Black 6. White A is under attack, and this variation is good for Black.]))(;W[kc];B[lc];W[ld];B[ke](;W[lb];B[jc];W[mc];B[kb]LB[kb:8][lb:5][ic:A][jc:6][kc:1][lc:2][mc:7][ld:3][ke:4]C[If White hanes at White 1, the moves up to Black 8 can be expected. This variation is also conceivable for both players. Next, White can consider connecting at 2, or playing atari at A.](;W[lc];B[id]LB[lc:9][id:10][jd:A]C[Connecting at White 9 is a bit passive. Black's happy to capture White A in a ladder.])(;W[ic];B[lc];W[qc](;B[id];W[pc]LB[ic:9][lc:10][pc:13][qc:11][id:12]C[Playing atari at White 9 is the proper move for White, and the result up to White 13 is playable for both sides.])(;B[pc];W[kc];B[ip];W[jb];B[jq]LB[jb:15][ic:9][kc:13][lc:10][pc:12][qc:11][ip:14][jq:16]C[Answering at Black 12 is better for Black in this game. This way, Black gets to play two moves in a row at the bottom, and this variation favors Black.])))(;W[le];B[jc];W[kb];B[kf](;W[jb];B[lf];W[ne];B[nf]LB[jb:9][kb:7][jc:6][kc:1][lc:2][kd:3][ke:4][le:5][ne:11][kf:8][lf:10][nf:12]C[Pushing up with White 5 is also conceivable for White. Pushing on the side where your cutting stone is, is usually the right technique. However, Black will build a wall in the center with Black 10 and Black 12, and it's a nice result for Black.])(;W[ic];B[lb];W[jb];B[md];W[me];B[ne];W[mc];B[mf];W[nd];B[lf];W[md]LB[jb:11][kb:7][lb:10][ic:9][jc:6][kc:1][lc:2][mc:17][ld:3][md:12][nd:15][ke:4][le:5][me:13][ne:14][kf:8][lf:18][mf:16]C[Playing atari at White 9 is a mistake, because Black 12 is a nice tesuji, and White will be in trouble. This is a terrible result for White, because Black becomes strong and powerful in the center.]))(;W[jc];B[md];W[lb];B[le];W[mc];B[mo]LB[kb:B][lb:7][mb:A][jc:5][kc:1][lc:2][mc:9][ld:3][md:6][ke:4][le:8][mo:10][kq:C]C[Connecting at White 5 isn't a good choice in this case. Up to White 9, Black's effectively walled off the top side in sente, and can develop a deep moyo on the right side with Black 10.If White omits White 9 and takes sente to pre-emptively reduce the right side, Black can start a ko with Black A, White 9 and Black B at any time. This ko is heavy for White and fairly light for Black, which means Black won't be under much pressure to win the ko.After Black 10, Black can also aim to play at C later.])))(;W[dk];B[fq];W[dn];B[dm];W[en];B[cq];W[co];B[dq];W[ce];B[cm];W[bo];B[em]LB[bd:A][ce:9][dk:1][cm:10][dm:4][em:12][bn:B][dn:3][en:5][bo:11][co:7][cq:6][dq:8][fq:2][hq:C]C[White might also consider pincering with White 1. However, after the moves through to Black 8, Black has good continuations at A and 10, and the moves up to Black 12 are playable for Black.The moves up to Black 8 in the lower left form part of an older joseki, and White would usually complete the joseki by playing atari at B. The result after B is regarded as being slightly better for White because White's thick and approaching at C later is a powerful move.However, if White completes the joseki with B in this case, Black will slide to A and will feel satisfied with the progression of the opening.])(;W[dj](;B[fq];W[dn];B[dm];W[en];B[cp];W[co];B[bo];W[do];B[bm];W[cq];B[bp](;W[em];B[dl];W[el];B[jp]LB[cf:A][dj:1][dl:14][el:15][bm:10][dm:4][em:13][cn:B][dn:3][en:5][bo:8][co:7][do:9][bp:12][cp:6][jp:16][cq:11][fq:2]C[White 1 is often played in handicap games, because it pincers both A and B simultaneously and prevents an ideal formation on the left side. However, it lacks severity.Black will respond with Black 2 to Black 14. After White plays to enclose Black with White 15, Black can develop rapidly with Black 16 and the result is good for Black. Black's stone at A is still light.])(;W[iq];B[em];W[eq];B[bd];W[cc];B[dh]LB[cc:17][bd:16][dh:18][dj:1][bm:10][dm:4][em:14][dn:3][en:5][bo:8][co:7][do:9][bp:12][cp:6][cq:11][eq:15][fq:2][iq:13]C[White might consider pincering at White 13, to avoid the previous variation, but Black 14 is a key point for power. Up to Black 18, Black feels satisfied with the counter-attack against White 1.]))(;B[cq];W[cp];B[dq];W[ep];B[bp];W[bo];B[bq];W[co];B[fq];W[ce];B[df];W[dh]LB[ce:11][cf:A][df:12][dh:13][dj:1][cn:B][dn:C][bo:7][co:9][bp:6][cp:3][ep:5][bq:8][cq:2][dq:4][fq:10]C[Responding to White's pincer at White 1 by offering a trade at Black 2 is often a good and simple strategy. However, in this case it's too simple and it hands the initiative to White, so it's a bad strategy in this situation.The moves from White 1 through to Black 10 follow a basic joseki, but Black's stones at A and B are left stranded. Instead of playing honte at C, White will kick Black A with White 11 and, if Black stands at Black 12, continue attacking with White 13. This result is good for White.]))(;W[cj];B[fq];W[dn];B[dm];W[en];B[cp];W[cq];B[co];W[dr];B[cl]LB[cj:1][cl:10][dm:4][dn:3][en:5][co:8][cp:6][cq:7][fq:2][dr:9]C[The low pincer at White is also conceivable. It makes a slightly stronger attempt at taking away Black's eyespace, but it's also harder to move into the center later.The moves up to Black 10 can be expected, after which it's hard to tell who's attacking whom. This result is acceptable for Black.]))(;W[ch];B[cc];W[dc];B[cd];W[de](;B[bf];W[eg]LB[cc:3][dc:4][cd:5][de:6][bf:7][cf:1][df:A][eg:8][ch:2]C[Playing a pincer at White 2 is also possible. This is a well known joseki and it's playable for both players. However, Lee would play Black 7 at A instead.])(;B[df];W[ce];B[be];W[bd];B[bc];W[bf];B[ad];W[ef];B[bg];W[dg];B[af];W[fg]LB[bc:11][cc:3][dc:4][gc:A][lc:B][ad:13][bd:10][cd:5][be:9][ce:8][de:6][af:17][bf:12][cf:1][df:7][ef:14][bg:15][dg:16][fg:18][ch:2][jp:C]C[After Black 1 through to White 6, Black would push up with Black 7. This move would be more appropriate in this situation.The moves from Black 1 to White 18 form another joseki. However, the result is slightly more favorable for Black. That's because Black can still invade at either A or B at the top later.Now Black can use sente to play at C, to develop his lower right corner. Black 7 is an interesting move in this situation.])))(;W[pb]LB[pb:1][lc:B][mc:C][qc:A][jp:D][fq:E]C[Sliding here was the most common move in this opening for a long time. However, in this case, Black can choose between A to C later, depending on the overall situation. Black might tenuki now and play around D or E, to see how White responds.That's why invading at 3-3 immediately, instead of sliding, has become more popular recently.])(;W[qc](;B[pc];W[pb](;B[ob];W[qb];B[oc];W[re];B[rf];W[qe];B[qf]LB[ob:4][pb:3][qb:5][oc:6][pc:2][qc:1][qd:A][qe:9][re:7][qf:10][rf:8]C[Invading immediately at 3-3 has been a popular move recently.Blocking at Black 2 is the right move in this opening. If Black plays Black 2 at A, White will simply connect at 2, which is good for White. The variation up to Black 10 is a well known joseki.];W[nb](;B[na];W[jc];B[pe]LB[ma:I][na:12][oa:H][pa:E][qa:F][nb:11][rb:G][jc:13][rd:D][pe:14][se:C][cf:A][jq:B]C[White 11 is the result of recent research, and can be regarded as something of a prototype joseki. After Black 14, White can tenuki and play moves like A or B next, and the result is even. White's top right corner group is stronger than it looks, because descending at E is sente for White.At best Black can start a ko in the corner with the sequence from C to H now. However, the ko can be a burden for Black because White's groups will be completely settled if he wins the ko at I. Furthermore, if Black hanes at C on his next move, White will tenuki and take another big point. And Black will still need to spend one more move to completely capture the corner.])(;B[oa];W[qd](;B[kd];W[pe];B[oe];W[of];B[ne];W[og];B[nf];W[ng];B[ph]LB[oa:12][nb:11][kd:14][qd:13][ne:18][oe:16][pe:15][nf:20][of:17][ng:21][og:19][ph:22]C[This is another possible variation. If Black descends at Black 12, White needs to reinforce the corner with White 13. Next, Black can pincer with Black 14 and steel himself to fight after White cuts at White 17. The moves up to Black 22 are playable for both.])(;B[nf];W[jd]LB[oa:12][nb:11][jd:15][qd:13][nf:14]C[Reinforcing with Black 14 is also possible, but then White will be happy to extend at the top with White 15.])))(;B[qd];W[rb];B[rc];W[qb]LB[pb:3][qb:7][rb:5][lc:A][mc:B][pc:2][qc:1][rc:6][qd:4]C[If Black switches direction with Black 4, you can expect this variation. This result is satisfactory for White, because White's already settled in the corner and playing at A or B is no longer as powerful as when White just slides with White 1 at 3.]))(;B[qd];W[pc];B[od];W[oc]LB[oc:5][pc:3][qc:1][od:4][qd:2][pf:A]C[Blocking at Black 2 is the wrong direction of play. White will easily connect with White 3 and Black A ends up too close to Black's wall and over-concentrated.])))