(;FF[4]CA[UTF-8]GM[1]DT[2019-03-23]PC[OGS: https://online-go.com/game/review/382445]PB[Landi60]PW[andrecopy]BR[20k]WR[17k]CP[online-go.com]TM[1200]OT[3x60 byo-yomi]RE[W+18.5]SZ[19]KM[6.5]RU[japanese];B[dd];W[pq];B[dq];W[pe];B[co];W[fq]C[This move is too close to your corner enclosure.](;B[hp]LB[pc:C]LB[qc:D]LB[po:A]LB[qo:B]C[A pincer attack like this is too early in the opening.Remember the proverb: corners, sides then center. This means moves in the corner has the most value in the beginning.This leads us naturally to moves like A - DOften at this level we feel the need to punish our opponent immediately for their 'overplays', but learning to bide your time is one very important aspect of becoming a stronger player.](;W[hq];B[iq]C[This hane is a good response. ];W[gq];B[ip]C[Excellent. Defending your cutting point is correct.Seems like you've learned from the last review very nicely.];W[eq]SQ[co]TR[dq]TR[eq]TR[fq]C[This shape is considered a bump. White is bumping into your D3 stone.A bump on the side usually warrants an extension away from any supporting stones. e.g. the square. Therefore you should play D2.](;B[dp]TR[co]LB[dr:A]C[Extending this way is not as good as D2. For one you are giving white a free hane at A. Secondly it makes your triangled stone very redundant.See the variation to see what I mean.](;W[dr]C[As expected, white plays the hane to secure eye space.];B[cr];W[es](;B[dk]LB[fo:A]TR[dp]TR[hp]C[I consider this as an extension from your marked triangle stones. Let's make this the aim of this review: understanding the importance of a "surround" on your opponent.When you get to surround your opponent's (not-yet-alive) stones in 1 move, i.e. by playing at A, it becomes a very, very large move.];W[qo]LB[fo:A]C[White defends his corner. But now is not the time. Remember the surround at A is very, very big.There's another good proverb to keep in mind: your opponent's vital point is also your own vital point.This means, A is a very big move for your opponent (white) in order to avoid being surrounded.When you have a situation where both players have the same 'important move', then that's the most urgent point on the board.](;B[pc]LB[fo:A]C[So you played away. Let's see what happens when white plays at A now.](;W[nd](;B[qd]C[This move is slack. It looks like you're just trying to defend your corner, but you are doing so at the cost of giving white a very strong outside position.];W[qe]TR[pe]TR[qe]TR[pg]TR[pi]TR[pk]TR[pm]TR[qo]C[After white blocks, his potential on the right side is outlined. His triangled stones work really well to make the right side as big as your left. It's worth approximately 30 points. Compared to your corner, which is only worth about 8 points at best.Often Go is a trade. Don't just focus on your end of the deal. Look at what you're also giving away.](;B[od]TR[nd]TR[od]TR[pe]C[This move is crude. Playing this move against the two triangled white stones is usually not recommended unless you plan to cut.Try to avoid moves like this. ];W[oe]SQ[qa]SQ[ra]SQ[sa]SQ[qb]SQ[rb]SQ[sb]SQ[qc]SQ[rc]SQ[sc]TR[od]TR[oe]TR[pe]TR[qe]TR[og]TR[oi]TR[ok]TR[om]TR[qo]C[The reasoning is simple. Notice how this triangled move you played helped your opponent to further build his outside position?Meanwhile, it has gained very little for you. The squares mark territory that is already yours with your previous 2 moves. The net gain of your triangled stone is next to none.];B[nc]C[So you've reverted to what I suggested. But now we run into a problem...];W[pd]LB[od:A]LB[oe:B]C[I hope by now you see the problem with the crude move at P16. It creates one unnecessary atari for you at P16 once white plays Q16.](;B[oc]C[Ouch!];W[rd];B[qc];W[md]C[This move is actually very big for white. It heavily restricted black's ability to make large territory on the top side.];B[mc];W[lc]C[This hane looks to be an overplay from your opponent.](;B[rc]C[Good.](;W[sd]C[Also, unless it's a special life or death situation, don't descend onto the 1nd line.](;B[fc]C[This is a big move. ];W[le]LB[fo:A]C[It's been 36 moves and neither player sees the importance of A at F5.](;B[hd]TR[aa]TR[ba]TR[ca]TR[da]TR[ea]TR[fa]SQ[ga]SQ[ha]TR[ab]TR[bb]TR[cb]TR[db]TR[eb]TR[fb]SQ[gb]SQ[hb]TR[ac]TR[bc]TR[cc]TR[dc]TR[ec]SQ[gc]SQ[hc]TR[ad]TR[bd]TR[cd]LB[fo:A]C[This, I can say for sure, is a very slow move. I can see what you're trying to do, but there are much larger things on the board to do.As to why this is slow, look at the marked shapes. The triangle marks all the territory that you've already made under your two existing stones. And the squares mark the 'net gain' of territory from your current move. In other words, this move only added 6 extra points to your position at best.It is often a mistake for beginners to see how their move adds value to the local position as a whole. Always consider what your CURRENT move ADDED to your position. If anything, I would like you to appreciate the value of A. It may sound very repetitive by now, but this move is so big it warrants such repetition. See my variation.];W[cf]C[Reckless invasion. ](;B[cd]LB[ce:A]C[This is one good, traditional and orthodox response. Definitely playable at this level. The only disadvantage to this move is that it is too soft on your opponent.There is another, modern and more severe alternative. That is the kick at A.];W[di]C[If you compare this with the variations I showed, white has a much easier time breaking apart this area of the board.](;B[fj]LB[fo:A]C[If you had played A now, this move would've been excellent afterwards...];W[fh];B[gi];W[gh];B[hi];W[hh];B[ih];W[ig];B[ii];W[jg](;B[jh]TR[ih]TR[ii]C[This is a very sluggish move. Understanding why this is sluggish involves the knowledge of shape and efficiency.Play at A instead, I'll explain there.];W[kg]TR[kg]TR[jh]C[If you've seen my variations, you'll understand now that the 'head' of your stones is now 'behind' your opponent's.If you go back to, say, move 45, notice the 'head' of your group is ahead of your opponent's?You almost never want to be pushing from behind.];B[kh];W[lh];B[li];W[mh];B[mi];W[ni]C[Now we're in a pushing battle where we're pushing from behind...];B[nj];W[oi](;B[mj]C[I see you have a keen eye for weaknesses. This instinct is good. But I think you have reached a level now where you should start thinking about when and how to defend.Normally, stronger players never want to suddenly 'retreat' into his own camp.];W[oj];B[ok];W[pk](;B[nk]C[When you have an option to advance, never choose retreat. Even though this is a weakness, you can defend it by putting on more pressure.];W[fo]C[White played this move finally. It is absolutely gargantuan. Game is not over, however.](;B[ep]C[You may be still thinking of cutting white. But your opponent will not sit idly by and let you succeed.This kind of wishful thinking never works at higher level. It's just like atari your opponent in hopes of capturing his stone if he doesn't see it. Obviously no one is going to let that happen ;)Thus, it's better to not play moves like this altogether.];W[go]SQ[re]SQ[se]SQ[lf]SQ[mf]SQ[nf]SQ[of]SQ[pf]SQ[qf]SQ[rf]SQ[sf]SQ[lg]SQ[mg]SQ[ng]SQ[og]SQ[pg]SQ[qg]SQ[rg]SQ[sg]SQ[nh]SQ[oh]SQ[ph]SQ[qh]SQ[rh]SQ[sh]TR[ji]TR[ki]SQ[pi]SQ[qi]SQ[ri]SQ[si]TR[gj]TR[hj]TR[ij]TR[jj]TR[kj]TR[lj]SQ[pj]SQ[qj]SQ[rj]SQ[sj]TR[fk]TR[gk]TR[hk]TR[ik]TR[jk]TR[kk]TR[lk]TR[mk]SQ[qk]SQ[rk]XX[el]XX[fl]XX[gl]XX[hl]XX[il]XX[jl]XX[kl]XX[ll]XX[ml]XX[nl]XX[em]XX[fm]XX[gm]XX[hm]XX[im]XX[jm]XX[km]XX[lm]XX[mm]XX[en]XX[fn]XX[gn]XX[hn]XX[in]XX[jn]XX[kn]XX[go]XX[ho]XX[io]XX[jo]XX[ko]C[Game becomes very difficult for black here.Reason is simple: After all that pushing battle you gave white a lot of territory to the right. Naturally you should be expecting large territory in compensation for you in the triangled area.But failure to play at the old 'A' spot means over half of the triangle spot is gone (marked crosses). So white has caught up significantly.Forgive me for repeating myself again. Playing F5 is a very, very large move. I hope you can see that now !](;B[mq]C[Settling yourself is standard, but it's not going to be enough for you to win the game.];W[nr];B[mr];W[nq](;B[np];W[op]LB[np:A]LB[op:B]C[If the hane helps your opponent get a tigers mouth at B, then just extend.];B[mp];W[no](;B[mo];W[nn]TR[nn]TR[mo]C[Pushing from behind again!];B[mn];W[nm];B[mm]TR[qj]TR[rj]TR[sj]TR[qk]TR[rk]TR[sk]TR[ql]TR[rl]TR[sl]TR[qm]TR[rm]TR[sm]SQ[kn]SQ[ln]TR[qn]TR[rn]TR[sn]SQ[ko]SQ[lo]TR[oo]TR[po]TR[qo]TR[ro]TR[so]SQ[jp]SQ[kp]SQ[lp]TR[pp]TR[qp]TR[rp]SQ[jq]SQ[kq]SQ[lq]SQ[jr]SQ[kr]SQ[lr]SQ[js]SQ[ks]C[Playing this way leads to a close game.];W[ho];B[io];W[in](;B[jn];W[im]C[Failing to punish this overplay is what lost you the last bit of advantage in this game.];B[jm]C[Most of the important concepts are covered before this point. A few crucial points to learn from this game:1. One move to surround your opponent is very, very big. This is especially true if your opponent's stones are not yet fully alive. Missing the surround at F5 for 30 or so moves was a huge missed opportunity. In the end your opponent played there first, and the damage was great.2. Stay 'ahead' of the pushing battle. Make sure the head (tip) of your stones is further than your opponent's. Don't push from behind.3. Cut when you think there's a hane overplay. But read carefully first before you cut.4. Crude moves are your enemy. Avoid at all costs.];W[il];B[jl];W[ik];B[jk];W[eo];B[ol];W[pl];B[om];W[pm];B[on];W[oo];B[pn];W[qn];B[pj];W[qj];B[pi];W[ph];B[qi];W[ri];B[po];W[pp];B[cj]C[Very big move.];W[fl];B[em];W[fm];B[gk];W[gl];B[hk];W[hl];B[en];W[fn];B[hr];W[gr](;B[hs]C[Remember: don't descend to 1st line until endgame.];W[gs];B[ir];W[ci];B[ei];W[eh];B[ef];W[df];B[de];W[ej];B[eg];W[fi];B[dg];W[cg];B[dh];W[ch];B[ek];W[fk];B[gj];W[dj];B[ck];W[bj];B[bk];W[el];B[dl];W[dm](;B[cm]LB[dn:A]C[You can actually play at A here.This is a matter of reading.];W[dn];B[cn]C[Letting go of 4 extra points in gote is huge for white.];W[aj];B[ak];W[bh];B[be];W[fe];B[ff];W[ge];B[gf];W[hf];B[ee];W[he];B[id];W[jd](;B[ie];W[ic](;B[jc]C[Be careful about your own connection.];W[jb];B[je];W[kc](;B[ke]C[Too reckless! ];W[hc](;B[kd];W[ld];B[jc];W[gd];B[gc];W[jd];B[sc];W[rf];B[jc]C[There's actually no point fighting this ko anymore once your stones are cut. Up to here the game is lost.];W[gb];B[hb];W[jd];B[ib];W[jc];B[fb];W[ia];B[ga];W[ja];B[lb];W[ha];B[gb];W[fd];B[ed];W[bf];B[ec];W[kf];B[gg];W[hg];B[ns];W[os];B[ms];W[pr];B[nl];W[la];B[ma];W[ka];B[mb];W[kb];B[cs];W[ds];B[fp];W[gp];B[ij];W[ae];B[ad];W[af];B[bd];W[jf];B[ce];W[if];B[do];W[qh];B[cq];W[rp];B[];W[])(;B[gd]C[You can only connect now.]))(;B[hc]C[Make sure your stones are safe, above all.]))(;B[je];W[kd];B[hc];W[ib]TR[ja]TR[ka]TR[jb]TR[kb]TR[jc]TR[kc]XX[ke]XX[if]XX[jf]XX[kf]C[White gains more than what you've destroyed.]))(;B[jc]SQ[ia]SQ[ja]SQ[ka]SQ[la]SQ[ma]SQ[ib]SQ[jb]LB[lb:A]SQ[mb]SQ[ic]C[You should be happy about playing this move. If you also get to play at A you can make a few points on the top edge.];W[kc](;B[je];W[kd])(;B[jb];W[je];B[sc];W[re])))(;B[dn];W[cm];B[bi];W[do];B[cn]C[White has no severe plays.]))(;B[ir]))(;B[hn]C[You can cut here. White's hane is a bit of an overplay.Remember: if you think a hane is overplay, cut it. How to know it's an overplay here? Try to read what happens to white if you cut. If you can see no good way for white to handle his position, then it's most likely an overplay.];W[fm];B[hm]SQ[hk]SQ[ik]SQ[hl]SQ[il]SQ[jl]SQ[im]SQ[jm]SQ[in]SQ[jn]C[If the best white can do is to let go of that stone, then you've done your job punishing it.]))(;B[pl];W[ol];B[om];W[nl];B[ml];W[nm];B[nn];W[mm];B[lm];W[mn]))(;B[mp]))(;B[hn])(;B[pl])(;B[im]TR[ji]TR[ki]TR[gj]TR[hj]TR[ij]TR[jj]TR[kj]TR[lj]TR[ek]TR[fk]TR[gk]TR[hk]TR[ik]TR[jk]TR[kk]TR[lk]TR[mk]TR[hl]TR[il]TR[jl]TR[kl]TR[ll]TR[ml]TR[nl]TR[jm]TR[km]TR[lm]TR[mm]TR[jn]TR[kn]TR[ln]XX[fo]XX[go]XX[eq]XX[fq]XX[gq]XX[hq]XX[dr]LB[hr:A]XX[es]C[A move like this aims to maximize this area while indirectly threatening the white group.Remember it has only 1 eye if you get to play the hane at A.](;W[pl]C[If white chooses greedy...];B[hr];W[gr];B[ir]XX[fo]XX[go]XX[eq]XX[fq]XX[gq]XX[hq]XX[dr]XX[es]C[Your only realistic option is to try capture this white group if white plays greedy at 2.It's going to be difficult.])(;W[ir];B[jr];W[hs];B[pl]SQ[pi]SQ[qi]SQ[ri]SQ[si]SQ[aj]SQ[bj]SQ[cj]SQ[pj]SQ[qj]SQ[rj]SQ[sj]SQ[ak]SQ[bk]SQ[ck]SQ[qk]SQ[rk]SQ[sk]SQ[al]SQ[bl]SQ[cl]SQ[jl]SQ[kl]SQ[ll]SQ[ml]SQ[nl]SQ[ol]SQ[am]SQ[bm]SQ[jm]SQ[km]SQ[lm]SQ[mm]SQ[nm]SQ[om]SQ[an]SQ[bn]SQ[jn]SQ[kn]SQ[ln]SQ[mn]SQ[nn]SQ[on]SQ[jo]SQ[ko]SQ[lo]SQ[mo]SQ[no]SQ[jp]SQ[kp]SQ[lp]SQ[mp]SQ[np]C[What becomes of these areas will decide who is the winner of the game.I count about 70 points for black and 60 for white. There's a very weak lead. Maintaining this advantage is your key to victory.Only by counting territory can you make conclusions like this.])))(;B[gn]C[That move was gargantuan. You'll have to admit your losses and move on.Black 1 is a kind of compensation. ]))(;B[ol]XX[nk]LB[pl:A]C[1 here not only extends your position and expands your center potential, it also threatens to turn at A and slice through your opponent's territory.What if white cuts now at X?];W[nk]C[This is an elementary tesuji problem. See if you can find it. Next move for answers.](;B[ml]C[Black 3 is standard tesuji. It captures the white stone in a net.Knowing this tesuji exists is what enables you to play black 1.])(;B[nl]C[You can also capture it in a ladder.But when you have the choice between capturing it in a net or a ladder, always choose the net.];W[kn]C[This is because ladders have a lot of aji. Your opponent can play a free ladder breaker.];B[mk];W[mn]C[With these two moves, your center potential is ruined.This is why ladder is not always good.])))(;B[mk]TR[ll]TR[km]TR[jn]TR[jo]C[If anything they'd want to play a move that's more efficient. The reason why the tiger mouth at 1 is more efficient than N10 is because it is one line further to the bottom. Which helps to enclose the gap in your large area better.Tiny details like this is what will amount to a game-winning advantage. Go's just a game about patience and gathering small advantages to win.]))(;B[ki]LB[jh:A]C[The reason why this is better than your move at A is because: both moves accomplish the task of keeping white from the bottom side, but 1 is a step 'further' from A.When your stones are in this kind of pushing battle against your opponent, jumping 'ahead' of your opponent becomes very, very important.];W[lg];B[fo];W[ir];B[jr];W[hs];B[mi])(;B[fo]SQ[gj]SQ[hj]SQ[ij]SQ[ek]SQ[fk]SQ[gk]SQ[hk]SQ[ik]SQ[dl]SQ[el]SQ[fl]SQ[gl]SQ[hl]SQ[il]SQ[dm]SQ[em]SQ[fm]SQ[gm]SQ[hm]SQ[im]SQ[dn]SQ[en]SQ[fn]SQ[gn]SQ[hn]SQ[in]SQ[do]SQ[eo]SQ[go]SQ[ho]SQ[io]C[But of course, this move is the biggest of them all. I mean it. With this one move, you can make all this territory IN SENTE.];W[ir];B[jr];W[hs];B[ki]C[If you played up to here, I see no way how black can lose this game.]))(;B[fo]C[I'm sure you've seen the inevitable sequence many times];W[ir];B[jr];W[hs]C[All standard up to here];B[fj]SQ[ek]SQ[fk]SQ[gk]SQ[dl]SQ[el]SQ[fl]SQ[gl]SQ[hl]SQ[dm]SQ[em]SQ[fm]SQ[gm]SQ[cn]SQ[dn]SQ[en]SQ[fn]SQ[gn]SQ[hn]SQ[do]SQ[eo]SQ[go]SQ[ho]C[Now when you play 5, see how 1 works with all your nearby stones to make profit in this area?];W[fh]C[White is under pressure and will need to defend for sure.];B[hi]SQ[gj]SQ[hj]SQ[fk]SQ[gk]SQ[hk]SQ[ik]SQ[fl]SQ[gl]SQ[hl]SQ[il]SQ[hm]SQ[im]SQ[hn]C[A successful attack is one where you're forcing your opponent to run while you take profit along the way.Remember this well.]))(;B[ce]C[Kicking an opponent's stone is to try defend in sente. White usually will not ignore this kick.](;W[df]XX[cc]TR[dd]TR[ce]TR[cf]C[The most standard response for the kick would be the extension at 2.In this local kick shape I've marked, after white extends to 2, there is a weakness in the corner at X. The scope of that weakness is beyond our review for now. What matters is the follow-up.];B[ch]SQ[aa]SQ[ba]SQ[ca]SQ[da]SQ[ab]SQ[bb]SQ[cb]SQ[db]SQ[ac]SQ[bc]SQ[cc]SQ[dc]TR[fc]SQ[ai]SQ[bi]SQ[ci]SQ[aj]SQ[bj]SQ[cj]SQ[ak]SQ[bk]SQ[ck]SQ[al]SQ[bl]C[Note that after white extended to 2, if you don't already have a stone at the triangle spot, you will almost have to play there immediately. One reason I recommended this kick is because you already have a stone there. Which gives you time to play moves like 3, which pincers your opponent's stone.This is why I called C14 a reckless invasion. Though you may not be able to capture the white stones (he will run, of course), but the profit from this attack is both in the corner and along the side. I've marked your territorial profit in squares.This is how you should think of a successful attack. It doesn't always mean you have to kill your opponent's stones. Forcing your opponent to run while you grab cash along the way is the best way to attack.])(;W[]C[IF white ignores the kick...];B[df]XX[cc]C[The follow-up would be the hane at 3. Now the white stone is as good as dead.If you've explored the other variation, you'll know that if white extended to black 3 himself, there would be a weakness in the X spot. But since white didn't play at black 3, that weakness is gone. This result is unbearable for white in most situations.];W[cg]SQ[aa]SQ[ba]SQ[ca]SQ[da]SQ[ea]SQ[ab]SQ[bb]SQ[cb]SQ[db]SQ[eb]SQ[ac]SQ[bc]SQ[cc]SQ[dc]SQ[ec]SQ[ad]SQ[bd]SQ[cd]C[What if white runs? I'm sure many of your opponent will try this. But don't worry, you've already taken your profit in the corner in squares. If you've seen the other variation, you'll know that a successful attack is forcing your opponent to run while you take profit along the way.];B[ci]SQ[aj]SQ[bj]SQ[cj]SQ[ak]SQ[bk]SQ[ck]TR[dk]TR[co]C[5 is a nice follow-up if you plan on taking territory on the left side. This works in this position because you have these marked triangle supporting stones. Squares mark more profit.];W[dg];B[ef]C[White is still in trouble and borderline being surrounded.As you can see, it's not worth it for white to run out the stone.])))(;B[fo];W[ir];B[jr];W[hs](;B[lb];W[kc])(;B[pn]TR[aa]TR[ba]TR[ca]TR[da]TR[ea]TR[fa]TR[na]TR[oa]TR[pa]TR[qa]TR[ra]TR[sa]TR[ab]TR[bb]TR[cb]TR[db]TR[eb]TR[fb]TR[nb]TR[ob]TR[pb]TR[qb]TR[rb]TR[ac]TR[bc]TR[cc]TR[dc]TR[ec]TR[ad]TR[bd]TR[cd]SQ[me]SQ[ne]SQ[re]SQ[se]SQ[lf]SQ[mf]SQ[nf]SQ[of]SQ[pf]SQ[qf]SQ[rf]SQ[sf]SQ[mg]SQ[ng]SQ[og]SQ[pg]SQ[qg]SQ[rg]TR[ck]TR[bl]TR[cl]TR[dl]TR[el]TR[fl]TR[am]TR[bm]TR[cm]TR[dm]TR[em]TR[fm]TR[gm]TR[an]TR[bn]TR[cn]TR[dn]TR[en]TR[fn]TR[gn]TR[hn]TR[ao]TR[bo]TR[co]TR[do]TR[eo]TR[go]TR[ho]TR[io]SQ[ro]TR[ap]TR[bp]TR[cp]SQ[rp]SQ[sp]TR[aq]TR[bq]TR[cq]SQ[qq]SQ[rq]SQ[sq]TR[br]SQ[fr]SQ[gr]SQ[hr]SQ[qr]SQ[rr]SQ[sr]SQ[fs]SQ[gs]SQ[qs]SQ[rs]SQ[ss]C[I've marked your territory in triangle, and white's in square. Just judging the diagram visually you can see you're actually very ahead in territory.Now the question is what to do next? There are a few options.You can look at the gap in territory on the upper left side, and play a move around there to link your stones together (thereby forming more territory). Or, in my case, I chose to play at 5 and plunge into white's potential. My reasoning is simply this: since black is already ahead in territory, black is in no rush to make a lot more. Seeing white is staking all his eggs in one basket (i.e. on the right side), all black needs to do is to make sure white doesn't get too much out of this area and black can look forward to a sure win.Notice this type of strategic thinking only begins with estimating the score. That's not to use a score estimator. But to actually try and count the number of territory you've made between your own stones. As you improve, the score estimator feature becomes increasingly unreliable. Therefore being able to analyze a position and make good judgement is a hidden skill in Go.])))(;B[sc]C[One drawback of playing 1st line is black 1 being sente.];W[rf]C[White will have to fix.])(;B[re];W[rf]LB[sb:B]LB[sc:A]C[Another drawback of the desend at T16 is that black can sacrifice a stone to prevent white turning at A in sente. This is rather minor detail at this level, but it is important for you to understand why white is better off playing S15 (black 1) instead of T16.]))(;W[re]LB[ra:D]LB[sb:B]LB[sc:A]LB[sd:C]C[Connection leaves the endgame variation A B C D for white.]))(;B[ld]C[An example refutation: cut. If your opponent is playing a hane where he should not, then the first instinct is to cut. Of course, knowing when your opponent is overplaying comes down to experience and understanding of the game theory. This will grow on you as you play more and improve.](;W[kc]C[To this white's best response is probably];B[rc];W[rf];B[sd];W[le]TR[kd]TR[je]TR[ke]TR[if]TR[jf]TR[hg]TR[ig]TR[gh]TR[hh]TR[fi]TR[gi]TR[ej]TR[fj]TR[ek])(;W[le]C[This atari seems no good for white. The rest is just a brief demonstration of a possible outcome. What you should learn from this is: cut when you think the hane is overplay.];B[kd];W[kc];B[ke](;W[mf];B[jc];W[jb];B[ib])(;W[ic](;B[rc]LB[ne:A]C[This should be sufficient for black. White is split into two with quite a major cutting point at A. Meanwhile black has a safe group in the corner.];W[lf];B[ie];W[gd])(;B[ne];W[me];B[nf];W[mg];B[ng];W[mh];B[pg];W[qg])))))(;AE[od];AE[oe];B[qc]TR[nc]LB[pd:A]C[If we removed your A, B exchange and just played at O17 instead, if white plays A then we can simply respond at 1.Compare this result with the result you get at move 29 in-game and you can see the harm of crude moves.In fact, crude moves are defined as: sente moves that do nothing but help your opponent and/or harm your own position.]))(;B[nc]TR[pc]C[Instead of playing P16, the 1 space jump attachment is better.];W[mc];B[nb];W[md]C[Moves 1-3 extend your corner, and white 2-4 defends his own position. ](;B[pk])(;B[fo]C[Always make sure to come back to this move.Go is known as the "surrounding game". If what you are doing has the word "surround" in it, then you can't be going wrong ;)];W[ir];B[jr];W[hs];B[pj]C[Now I'd consider playing 9 to thwart white's plans on making large territory on the right.])))(;B[qe]C[The correct move is here. There are lots of josekis you can check on josekipedia.com. It has a lot of variations covering this specific shape.];W[qf];B[pf]C[This would be the standard variation. Many, many different variations exist after this.];W[qd]C[As one example...];B[re];W[oe];B[qg];W[rd];B[rf];W[pd];B[qk];W[fc]))(;W[fo]TR[hp]TR[ip]TR[iq]C[Not only did white avoid being surrounded in 1 move, this jump also 'cut off' the three black stones. Now black must settle his group.];B[mq]C[Making an extension along the side is one standard way to 'settle' your group.Here by settling I mean making enough room for your stones so that, in times of need (e.g. when you are being surrounded) you have room to make 2 eyes.];W[nd]C[The game would continue as normal. But white 1 and black 2 exchange is good for white. This is because white has managed to avoid the full surround by black, which would've been extremely advantageous for black.]))(;B[fo]C[By playing here the same sequence essentially follows.];W[ir];B[jr];W[hs]TR[bl]TR[cl]TR[dl]TR[el]TR[fl]TR[gl]TR[bm]TR[cm]TR[dm]TR[em]TR[fm]TR[gm]TR[hm]TR[bn]TR[cn]TR[dn]TR[en]TR[fn]TR[gn]TR[hn]TR[in]TR[do]TR[go]TR[ho]C[It's very unlikely that white will start invading in this area, so you can already consider this area your territory.This is a lot of territory.];B[pc]C[Plus you also get sente.]))(;B[fo]LB[eo:D]LB[go:C]LB[ep:A]LB[gp:B]C[By playing here, you're essentially forcing white to answer this question: "You've got nowhere to run. Now, are you alive, or are you dead?" As a reading exercise, see for yourself why white cannot escape this net above by playing moves like A to D.Also as a reading exercise, see if you can work out how to kill white on the bottom if black gets to play first.](;W[ir]C[In order to make life, white must play these moves on the 2nd line...];B[jr]C[But you don't have to worry about killing white. Getting 1 and 3 on the "outside" position is more than good enough for you.](;W[hs]C[And with this, white is alive in the corner. However, notice the moves 1 and 3 are on the outside. That means these stones you placed will be useful throughout the rest of the game. Whereas white only has stones on the "inside". You should learn to feel overjoyed with result like this. Even though you could not kill white, but "surrounding on the outside with a strong position is sufficient".];B[po]TR[df]TR[dh]TR[dj]TR[dl]TR[co]TR[dp]TR[hp]TR[ip]TR[dq]TR[iq]C[If you compare this result with move 21 in the real game, you will notice a huge difference. Not only does white not get to defend his bottom right corner, you also have an overwhelming potential on the left side of the board. With this, black is at a great advantage.])(;W[hr]))(;W[]C[Suppose if white ignores the position locally. Black can kill white.The answer is on the next move.](;B[cs]TR[dr]XX[er]TR[es]C[The descend is a good answer against a tigers mouth on the 2nd line. In doing so you can usually prevent white from making an eye at the cross spot.](;W[ir]C[White may struggle this way.];B[jr];W[hs](;B[gr];W[fr];B[gs];W[ds];B[js])(;B[ds]C[But this atari is deadly. Black 3 helps to set this up. White is dead no matter what he does.](;W[fr];B[js])(;W[is];B[gr])(;W[gr];B[er];W[fs])))(;W[ds]C[This seems like the most obvious resistance, but it's also the worst.];B[fs];W[er];B[hr]C[Simply dead.]))(;B[hr]C[Often the trick to killing a group is to first reduce its eye space. This hane kills white. ];W[gr];B[ir]TR[er]TR[fr]TR[fs]C[No way to make 2 eyes now from the bent-3 shape inside.Because black 1 is directly threatening to kill white, this is what makes black 1 very valuable and severe.]))))(;AE[dp]C[One technique strong players use to analyze if their move is good or bad locally is to use something called 'tewari'.Tewari involves reshuffling the order of the moves and see if what you played made sense.Here I'm removing the last stone you played];AE[eq]C[And the last stone your opponent played];AE[co]C[One more stone for you];AE[gq]C[And one more for your opponent.Always remove an equal number of stones from each side. If I removed 2 stones for black, then I also remove 2 stones for white.We usually try to remove stones that have a similar function. But we won't talk about that for now. Just know that this method exists, and I'm using it to demonstrate why D4 is a slow move.];W[eq]C[In case you clicked on this icon, you would have missed my explanations in the 4 empty squares earlier. Press '<' arrow key four times to see the text.In this position, if your opponent bumps your stone now, you would extend up, yes?];B[dp]LB[dp:B]LB[eq:A]C[The move A and B makes sense for both players. In fact, B is the most standard response to a move like A.];AW[gq]LB[cn:A]LB[fo:B]C[Now consider white playing this move, where would you play next? If it was me, I'd want to play A to take some large territory in the corner. Or perhaps B to keep white surrounded and force him to live...];AB[co]TR[dp]C[But instead, you played here. Now do you see how slow of a move C5 is?So what is this technique telling us? It answers the question: "is D4 a bad move in response to E3?" and the answer is yes. Because by playing D4, you are making C5 look bad.Sometimes it feels weird to juggle moves like that. But if you think about it carefully, it will make sense.This is why D2 is better than D4.]))(;B[dr]TR[hp]TR[ip]TR[iq]C[This move prevents white from making any eye shape on the bottom.And the presence of the three triangled stones give this white stick a nice squeeze.]))(;W[qo]C[To illustrate my point: suppose if white ignores your attack...];B[hr]C[To fully surround the stone you have to shut its room on the bottom.];W[fc]C[White ignores...];B[fo]C[And finally, you capture it in a large way.];W[cf]XX[dd]XX[ep]XX[fp]XX[gp]TR[qp]TR[rp]TR[sp]XX[eq]XX[fq]XX[gq]TR[qq]TR[rq]TR[sq]XX[er]XX[fr]XX[gr]TR[qr]TR[rr]TR[sr]XX[es]XX[fs]XX[gs]TR[qs]TR[rs]TR[ss]C[But compare what you gained with what your opponent has gained. In terms of points, it's essentially the same. Triangle marks white's gain, and crosses mark yours.But when you look on the top left corner, it looks like black is under attack. Top right is still white's corner. In other words, white has 2 solid, safe corners while black has 1 larger corner and 1 that's under severe attack. Black is already behind by playing this way. This shows that your pincer on H4 is considered too 'small'.]))(;B[po]C[This move used to be very common. Now less so.];W[qo];B[qn];W[qp];B[pn];W[nq];B[pj]C[This is a joseki. Very commonly played.])(;B[qo]C[The 3,4 approach against the komoku stone is always considered a big move.];W[op];B[qk]C[This would lead to a very different game.];W[kq](;B[qg])(;B[pc]))(;B[pc]C[This move can lead to complicated variations.];W[nd](;B[qe]C[Probably not a good idea in this position.];W[qf];B[qd];W[pf](;B[qo])(;B[nb];W[qn]TR[ph]TR[pj]TR[pl]C[This doesn't seem too good for black. Even though black takes white's corner, white gets a really decent outside position for compensation.]))(;B[nc](;W[md])(;W[mc];B[md]C[Leads to very complicated positions.])))(;B[qc];W[oc];B[qe];W[qf](;B[re];W[pf])(;B[pf]C[Again, complicated and involves ladder.])))