(;FF[4] CA[UTF-8] GM[1] GN[ KataGo 7 komi self-play - game 73] PC[https://online-go.com/review/766997] PB[KataGo] PW[KataGo] BR[9p] WR[9p] OT[Error: time control missing] RE[?] SZ[19] KM[7] RU[NZ] ;B[pd] ;W[pp] ;B[qn] ;W[dp] ;B[dd] ;W[nq] ;B[qf] ;W[cf] ;B[ch] ;W[fq] ;B[ce] ;W[df] ;B[fd] ;W[dh] ;B[di] ;W[eh] ;B[cn] ;W[hc] ;B[ei] ;W[ci]TR[fi]C[Game 10 continued at F11 instead of C11. https://online-go.com/review/456362 ] ;B[cj] ;W[bi] ;B[dk] (;W[bj] (;B[bk]TR[ch]C[So black has to block to force white to capture C12 if white wants to live locally. ] (;W[cl]C[White gets this peep for free. ] ;B[ck] (;W[fi]TR[di]TR[ei]C[This hane reduces the liberties of the two marked stones. At the same time, white is trying to run into the center. ] (;B[fh] (;W[ff]C[So the correct move here is to jump. ] (;B[fg] ;W[eg] ;B[gf] ;W[fe] (;B[gd]TR[hc]TR[fe]SQ[fh]C[So instead, black plays here. H17 and F15 form an elephant's eye. Playing here was the true intention behind the F12 cut. ] (;W[hh] ;B[hd] (;W[fj]C[So white extends first. ] (;B[bh]TR[bi]TR[ci]TR[bj]C[So black captures these three stones. ] ;W[gg] ;B[jc] ;W[co] (;B[dn]C[That's why this move is quite big even though black doesn't really want to play it. ] ;W[qo] ;B[pn] (;W[pj] (;B[mn]LB[nn:B]LB[lo:D]LB[mo:C]LB[no:A]C[A, B, C and D have about the same winrate as this move. ] (;W[lp]C[White doesn't want that to happen. ] (;B[ko] ;W[lo] ;B[ln] ;W[kn] (;B[ll] (;W[nj] ;B[jo] ;W[km] ;B[no] (;W[kq]TR[jo]TR[ko]C[White is trying to threaten the two stones, so black should handle that next. The problem for white is that L3 leaves some aji in the corner. We're gonna see how black exploits that later. ] ;B[fp] (;W[im] ;B[in] ;W[gp] ;B[hm] ;W[kl] ;B[fo] (;W[lk]TR[ll]TR[ln]TR[mn]TR[pn]TR[qn]TR[no]C[So instead, white puts pressure on this group. ] (;B[ok]C[So in the actual game, black's goal is to live in sente. That means black needs to make some bad exchanges that help white in the center. ] ;W[oj] ;B[mk] ;W[mj] ;B[eq] ;W[dq] ;B[er] (;W[ro]C[In the actual game, white chooses to protect the corner and force black to live. ] ;B[hg] ;W[dj] ;B[qk] ;W[pk] ;B[pl] ;W[qj] ;B[rk] ;W[dr] ;B[ej] ;W[ek] ;B[dj] ;W[gh] ;B[gq] ;W[rj] ;B[om] ;W[bn] ;B[oc] ;W[kc] ;B[kd] ;W[jb] ;B[kb] ;W[lc] ;B[ib] (;W[cc]C[But white chose not to live on the top. ] (;B[mf]C[Instead, black chose to enclose the upper side. ] ;W[ec] ;B[dc] ;W[ed] ;B[eb] ;W[fc] ;B[cb] ;W[qc] ;B[qd] ;W[rd] ;B[qb] (;W[be] ;B[gc] ;W[fb] ;B[bd] ;W[pf] ;B[re] (;W[nd]C[This move makes the ladder work for white. ] ;B[ld] ;W[nf] ;B[nc] ;W[hq] ;B[gr] ;W[hr] ;B[bm] ;W[bl] ;B[dl] ;W[cm] ;B[dm] ;W[de] ;B[cd] ;W[ho] (;B[hn] ;W[am] (;B[rn]TR[np]C[After black plays this, white has to fix the issue around O4. ] ;W[fm] (;B[fn] ;W[np] ;B[so] ;W[sp] ;B[sn] ;W[rp] ;B[bo] ;W[bp] ;B[ng] ;W[pg] ;B[of] ;W[qg] ;B[oe] ;W[ic] ;B[ja] ;W[rg] ;B[rf] ;W[ea] ;B[jg] ;W[db] ;B[bc] ;W[ml] ;B[gb] ;W[gm] ;B[gn] ;W[do] ;B[em] ;W[sg] ;B[sf] ;W[pe] ;B[qe] ;W[bg] ;B[aj] ;W[gk] ;B[ds] ;W[cs] ;B[es] ;W[gs] ;B[fr] ;W[bb] ;B[ab] ;W[cr] ;B[hf] ;W[lg] ;B[lf] ;W[kg] (;B[kh]C[In the actual game, black played this. This is a really cool move. ] (;W[mh]C[So white has to save the two stones. ] ;B[kf] (;W[eo] ;B[en] ;W[ih] ;B[nh] ;W[od] ;B[pc] ;W[lh] ;B[jh] ;W[oo] ;B[jq] ;W[jr] ;B[on] ;W[ge] ;B[he] ;W[il] ;B[kp] ;W[lq] ;B[jj] ;W[ep] ;B[ai] ;W[ig] ;B[jf] ;W[kj] ;B[iq] ;W[ir] ;B[bi] ;W[sk] ;B[sl] ;W[sj] ;B[rl] ;W[ji] ;B[po] ;W[op] ;B[al] ;W[ak] ;B[li] ;W[mi] ;B[al] ;W[rm] ;B[qm] ;W[ak] ;B[ki] ;W[ii] ;B[al] ;W[og] ;B[ne] ;W[ak] ;B[qq] ;W[qp] ;B[al] ;W[ba] ;B[ca] ;W[ak] ;B[lj] ;W[kk] ;B[al] ;W[jn] ;B[bm] ;W[da] ;B[aa] ;W[io] ;B[an] ;W[ap] ;B[nk] ;W[mo] ;B[bq] ;W[ar] ;B[ao] ;W[bs] ;B[ae] ;W[bf] ;B[oh] ;W[ph] ;B[oi] ;W[pi] ;B[ga] ;W[fa] ;B[hl] ;W[hk] ;B[if] ;W[go] ;B[mm] ;W[nl] ;B[aq] ;W[cp] ;B[br] ;W[cq] ;B[hp] ;W[ip] ;B[ol] ;W[lm] ;B[nm] ;W[ll] ;B[ik] ;W[ij] ;B[rh] ;W[ri] ;B[cg] ;W[af] ;B[ad] ;W[mg] ;B[fl] ;W[gl] ;B[ah] ;W[ag] ;B[nn] ;W[ls]C[KataGo 50 % -- chat -- Maharani: Three-part video review by terrific, OGS 5d: Maharani: https://youtu.be/ocY3m8d3K04 Maharani: https://youtu.be/4nJG3sqoe9M Maharani: https://youtu.be/qAEMP4RSUJM ] )(;W[jh]C[Now, white cannot block black. ] ;B[ih]C[Because this is atari. ] ;W[ji] ;B[ii]C[Black can destroy white's points in the center. ] ;W[ij] ;B[oo] ;W[hi] ;B[ig] ;W[il] ;B[ai] ;W[eo] ;B[en] ;W[al] ;B[kk] ;W[lm] ;B[lh] ;W[mg] ;B[jj] ;W[ne]C[KataGo gives white -8 pp for 184. K12 ] ))(;W[kf]C[White cannot continue moving into black's territory. ] ;B[lh]TR[kf]TR[kg]TR[lg]C[The white stones will be captured. ] ;W[mh] ;B[mg] ;W[jh] ;B[jf] ;W[ep] ;B[ai] ;W[bi] ;B[al] ;W[ak] ;B[jq] ;W[jr] ;B[al]C[KataGo gives white -35 pp for 182. L14 ] ))(;B[kf]C[It looks like black has to block here. ] ;W[jh] ;B[ih] ;W[ii] ;B[ig] (;W[ki]C[This allows white to build some territory in the center. ] )(;W[ep] ;B[al] ;W[ak] ;B[ip] ;W[hp] ;B[al] ;W[pc] ;B[od] ;W[ak] ;B[jq] ;W[jr] ;B[al] ;W[pb] ;B[rb] ;W[ak] ;B[kr] ;W[lr] ;B[al] ;W[rc] ;B[sb] ;W[ak] ;B[ai] ;W[al] ;B[il] ;W[jm] ;B[bi]C[KataGo gives black -34 pp for 181. L14 ] )))(;B[mq]TR[rn]C[If white ignores S6, black can attach here. ] (;W[mr]C[White has to connect on the second line. ] )(;W[np]C[If white plays like this, white has a shape issue here. ] (;B[mp] ;W[mo] ;B[jq]C[Black can attach. ] )(;B[jq]C[Attaching directly is even better for black. ] ;W[jr] ;B[mp] ;W[lr] ;B[mo] ;W[mr]C[White can only connect on the second line. ] ))))(;B[mq]TR[rn]C[If black attaches here directly rather than playing S6 first, what's the difference? ] ;W[np]C[White could play here. ] (;B[mp] ;W[mo] ;B[jq] ;W[mr] ;B[kp] ;W[lq] ;B[jr]C[If black plays like this, it really hurts the center. Let me see how to kill. ] (;W[nl]C[Maybe something like this. ] )(;W[rm]C[You probably jump first. ] ;B[qm] ;W[nl]C[And then peep. ] ))(;B[fm] ;W[mo]TR[mk]TR[ok]TR[qk]TR[rk]TR[ll]TR[pl]TR[om]TR[ln]TR[mn]TR[pn]TR[qn]TR[no]C[In other words, black cannot give white this move, which is sente towards black's group. Black has to play something to live. ] )(;B[jq] ;W[jr] ;B[mp] ;W[lr] ;B[op] ;W[oq] ;B[oo] ;W[mo] ;B[pq] ;W[pr] ;B[qq] ;W[qr] ;B[rq] ;W[rn] ;B[rm] ;W[rr] ;B[ng] ;W[pg] ;B[ne] ;W[qg] ;B[rg] ;W[rh]C[KataGo gives black -12 pp for 133. N3 ] ))(;B[op]C[The difference is that black really needs this sente to live in the center. ] ;W[oq] ;B[po] ;W[qq] ))(;B[bo] ;W[am] (;B[bp] ;W[bq] ;B[cp] ;W[do] ;B[cq] ;W[br] ;B[cr] ;W[cs]C[Black can't really kill anything here. ] )(;B[hn] ;W[me] ;B[md] ;W[fm] ;B[fl] ;W[gl] ;B[kk] ;W[lj] ;B[gk] ;W[fk] ;B[hl] ;W[el] ;B[go] ;W[hp] ;B[bp] ;W[bq] ;B[jk] ;W[lm] ;B[ml] ;W[mm] ;B[op]C[KataGo gives black -1.5 pp for 131. B5 ] ))(;B[al]C[Black can capture the three stones, but white will keep ignoring that. ] ;W[hn] (;B[bo]C[If black just captures, the corner is alive. ] ;W[bp] ;B[an] ;W[br] )(;B[bp]C[Black can play this way. ] ;W[bo] ;B[br] ;W[cr] ;B[bq] ;W[bs] ;B[ar] ;W[ap]TR[hn]C[But in this case, the corner is gonna be a seki. White has no points, but white is safe and H6 is a very big move, so black can't really do this. ] )(;B[gm] ;W[il] ;B[hs]C[KataGo gives black -39 pp for 131. A8 ] )))(;W[jd] ;B[ic] (;W[ke] ;B[me] ;W[ld]C[Even if white captures, it looks like this ponnuki is not safe. ] ;B[jg] )(;W[le] ;B[ke] ;W[kf] ;B[je] ;W[jf] ;B[lf] ;W[ie] ;B[id] ;W[ld] ;B[jd] ;W[ne] ;B[me] ;W[lb] ;B[ja] ;W[nd] ;B[nf] ;W[of] ;B[md] ;W[nc] ;B[mc] ;W[ob] ;B[nb] ;W[mb] ;B[na] ;W[oe] ;B[pb] ;W[lg] ;B[ng] ;W[nh] ;B[ma] ;W[bm] ;B[dl] ;W[hq]C[KataGo gives white -3.5 pp for 116. K16 ] )))(;W[rb]C[If I remember correctly, white can live here. ] ;B[pb] (;W[rf]C[Yeah, with this. ] ;B[rg] ;W[qe] ;B[pe] ;W[re] ;B[pg] ;W[sf] ;B[rh] ;W[ra]C[This way, white can live in the corner. ] ;B[lj] ;W[kk] ;B[li]TR[mj]TR[nj]TR[oj]TR[pj]TR[qj]TR[rj]TR[pk]C[But the problem is that this white stick is gonna be in danger. ] )(;W[le] ;B[je] ;W[lf] ;B[rg] ;W[ld] ;B[gc]C[KataGo gives white -19 pp for 110. S18 ] )))(;B[be]C[Black cannot descend. ] ;W[ec] ;B[ed] ;W[fb] (;B[dc] ;W[db] ;B[fc] ;W[eb] ;B[bb] ;W[bc] ;B[ac] ;W[ab] ;B[aa] ;W[ad] ;B[bd]C[This is a ko, so this is a success for white. It's basically a ko for free. ] )(;B[bm] ;W[bl] ;B[dl] ;W[cm] ;B[dm] ;W[am] ;B[dc] ;W[db] ;B[fc] ;W[eb] ;B[bc]C[KataGo gives black -8 pp for 99. B15 ] ))(;B[bd]C[But black can kill the corner with B16, actually. ] (;W[bf] (;B[be]TR[bf]C[However if white descends, black can only defend here. Anything else does not work. ] (;W[jd] ;B[ic] ;W[qc] ;B[qd] ;W[lb] ;B[ke] ;W[nb] ;B[ob] ;W[ka] ;B[hq]TR[cc]C[White has more ko threats now thanks to C17. ] ;W[ia] ;B[hb] )(;W[de] ;B[dc]TR[de]C[If white makes this exchange immediately, the winrate goes back to 50-50. Ko threats are the only reason I can see for why this is a bad exchange. ] ))(;B[dc]C[This can be safe, but apparently black is losing points here whatever you play. ] ;W[be] (;B[cd] ;W[ad] ;B[ac] ;W[ae] ;B[bc] )(;B[bc] ;W[de] ;B[cd] )))(;W[bm] ;B[dl] ;W[bg] ;B[be] ;W[jd] ;B[ic] ;W[qc] ;B[mf] ;W[qd] ;B[qe] ;W[ob] ;B[nb] ;W[pb] ;B[nc] ;W[ml]C[KataGo gives black -2.5 pp for 99. B16 ] ))(;B[dc]TR[cc]C[If black blocks from the other side, this exchange is already good for white. ] ;W[jd] ;B[ic] ;W[ke] ;B[be] ;W[lb] ;B[nb] ;W[hq] ;B[gr] ;W[hr] ;B[dl] ;W[ml] ;B[rn] ;W[nd] ;B[of] ;W[nf]C[KataGo gives black -8 pp for 99. D17 ] ))(;W[jd] ;B[ic] (;W[ke] ;B[lb] ;W[mc]TR[kd]C[If white captures L16, this result is not enough for white to win. ] )(;W[bm] ;B[el] ;W[ke] ;B[lb] ;W[be] ;B[bd] ;W[ld] ;B[mc] ;W[ml] ;B[rn] ;W[bg] ;B[ae]C[KataGo gives white -8 pp for 98. K16 ] ))(;W[qc] (;B[qd] ;W[jd] (;B[ja]C[Black cannot take. ] ;W[ic] ;B[id] ;W[jb]C[This ko is too big. ] )(;B[ic]C[So black has to connect. ] ;W[lb]C[Black does not want this atari to be sente. ] (;B[ja] ;W[ke]C[This would be a happy result for white. ] )(;B[ke]C[So black extends. ] ;W[nb]TR[qc]C[This is sente thanks to R17. ] ;B[ob] ;W[ka]C[Then white can live on the side. ] (;B[jg] ;W[ia]C[Notice this hane. ] (;B[ha] ;W[hb] ;B[ja]C[Black could start this ko if black has more ko threats. Black can probably not fight it because it's too big. ] )(;B[hb]C[Otherwise, black has to play this. ] ;W[li] ;B[ha]C[It's possible that black can start THIS ko. If black has more ko threats, H19 is sort of (but not actually) double sente. White does not want this to be sente, but it depends on the ko threats. ] ))(;B[bm] ;W[bl] ;B[dl] ;W[cm] ;B[dm] ;W[ml] ;B[op] ;W[oq] ;B[po] ;W[qp] ;B[al] ;W[rd] ;B[re] ;W[pb] ;B[nc] ;W[mb] ;B[oa] ;W[ia] ;B[hb] ;W[rb] ;B[ha] ;W[sc] ;B[ja]C[KataGo gives white -3.5 pp for 98. R17 ] ))))(;B[pb]C[Can black play on this side? ] ;W[re]C[The answer is no because white has this keima. ] ;B[rf]C[Black cannot block. ] ;W[qe] ;B[pe] ;W[pf]C[Because white can cut. This fight favours white. Even if black captures the corner, white gets some forcing moves on the outside. ] )))(;W[ql]C[It seems like this is the vital shape point. ] ;B[qk]C[But black can play this. ] ;W[rk]C[The variations here are a little complicated. This is just one possible variation. I'm not going to go over every detail. ] (;B[pk]C[This and the following kosumi are sente, but black will not play them immediately. ] ;W[qj] ;B[rm] ;W[rl] )(;B[op]C[Instead, black will attach, hane and 3-3 first. ] ;W[oq] ;B[ro] ;W[rp] ;B[qq] ;W[rn]C[If white ataris, black can atari, connect and cut. ] ;B[rm] ;W[so] ;B[pk] ;W[qj] (;B[rl]C[This way, black can live locally. ] )(;B[po]C[This move is sort of sente as well, but black won't play it immediately. ] ))(;B[ro] ;W[rp] ;B[op] ;W[oq] ;B[pk] ;W[qj] ;B[qq] ;W[pq] ;B[rm] ;W[po] ;B[kk] ;W[lj] ;B[rl] ;W[dr] ;B[gq] ;W[nk] ;B[ol]C[KataGo gives white -1.5 pp for 74. R8 ] )))(;B[oq]C[Black can live in a different way. ] ;W[op] ;B[np] ;W[mq] ;B[qq] ;W[pq] ;B[qp] ;W[qr] ;B[ro]C[Black could live like this. ] ;W[eq]C[But that means white can go back to the bottom left. ] ;B[bo] ;W[bp] ;B[do] ;W[cp] ;B[oc] ;W[dj] ;B[ej] ;W[ek] ;B[dj] ;W[dl] ;B[bl] ;W[fl]C[KataGo gives black -10 pp for 67. P3 ] ))(;W[eq]TR[ll]TR[ln]TR[mn]TR[pn]TR[qn]TR[no]C[Now, white cannot answer locally because the black group on the right side will live happily. ] (;B[mj]TR[ll]SQ[hm]SQ[cn]SQ[dn]SQ[in]TR[ln]TR[mn]TR[pn]TR[qn]SQ[fo]SQ[jo]SQ[ko]TR[no]SQ[fp]C[Black can escape with something like this. Black has handled both groups nicely. ] )(;B[hg] ;W[dj] ;B[mj] ;W[pg] ;B[gh] ;W[ej] ;B[il] ;W[qg] ;B[bf] ;W[gi] ;B[pf] ;W[kj] ;B[mh] ;W[nk] ;B[mk] ;W[ng] ;B[jq] ;W[ih] ;B[kh] ;W[nl] ;B[ml]C[KataGo gives white -0.4 pp for 66. E3 ] )))(;W[eq]TR[fp]C[If white plays something like this, that is a good exchange for black. Black got F4 for free. ] ;B[lj] ;W[qh] ;B[im] ;W[ql] ;B[pl] ;W[pk]C[KataGo gives white -4 pp for 60. E3 ] )(;W[gp] ;B[gq]C[If white tries to refute, black can get more free moves on the outside. ] ;W[hq] ;B[gr] ;W[fr] ;B[fo] ;W[hr] ;B[eq] ;W[er] ;B[dq] ;W[cq] ;B[ep] ;W[dr] ;B[go]C[KataGo gives white -5 pp for 60. G4 ] ))(;W[np]C[White could fix the shape weakness this way. ] (;B[kq]TR[jo]TR[ko]C[The problem is that black would respond here, strengthening the two stones. ] )(;B[jq] ;W[in] ;B[io] ;W[lm] ;B[mm] ;W[ml] ;B[ok] ;W[nl] ;B[oj] ;W[oi] ;B[pk] ;W[pi]C[KataGo gives white -9 pp for 58. O4 ] )))(;W[jo]C[White doesn't want to go back to capture. It would give black an atari for free. ] (;B[km] ;W[jn] )(;B[oi] ;W[qh] ;B[pi] ;W[qi] ;B[oj] ;W[pk] ;B[rk] ;W[rj] ;B[ql] ;W[pf] ;B[qe] ;W[ok] ;B[mj] ;W[pg] ;B[ne] ;W[nl] ;B[no] ;W[nf] ;B[mf] ;W[ng] ;B[me]C[KataGo gives white -0.5 pp for 54. K5 ] )))(;B[km]C[It's a little tempting to play this atari, but that's a bad exchange. ] ;W[jn]TR[km] (;B[ll]C[Let's say black tigers. At this moment, white doesn't even need to fix. ] (;W[jo]TR[ko]C[If white came back to capture L5, this would be pretty good for black. ] )(;W[hn]C[In the future, white would fix in a different way. For example, white could jump. ] ))(;B[nj] ;W[jm] ;B[kl] ;W[ql] ;B[pl] ;W[qh] ;B[qk]C[KataGo gives black -6.5 pp for 53. L7 ] ))(;B[jo]C[This would transpose to the game variation. ] ;W[km] (;B[ll] ;W[nj] )(;B[nk] ;W[ql] ;B[no] ;W[kq] ;B[ni] ;W[qh] ;B[og] ;W[ol] ;B[ll] ;W[rn] ;B[rm] ;W[on] ;B[po] ;W[oo] ;B[qp] ;W[ro] ;B[op] ;W[pq] ;B[om] ;W[qm] ;B[nn] ;W[oq] ;B[im] ;W[jl]C[KataGo gives black -0.1 pp for 53. K5 ] )))(;B[nk]C[Black has other options here as well. ] ;W[qh] ;B[og] ;W[pl] ;B[oi] ;W[om] ;B[on] ;W[nm] ;B[nn] ;W[mm] ;B[op] ;W[pq] ;B[lm] ;W[ll] ;B[kn] ;W[mk] ;B[jp] ;W[jl]C[KataGo gives black -1.5 pp for 49. O9 ] )(;B[nj]C[Or cap. ] ;W[pl] ;B[rm] ;W[nl] ;B[op] ;W[oq] ;B[qp] ;W[rp] ;B[qq] ;W[ro] ;B[po] ;W[pq] ;B[rr] ;W[rq] ;B[qr] ;W[sr] ;B[ok] ;W[pk] ;B[ol] ;W[om] ;B[pm] ;W[qg] ;B[pf] ;W[pg] ;B[nm] ;W[ni] ;B[mi] ;W[mh] ;B[li]C[KataGo gives black -2 pp for 49. O10 ] )(;B[ql]C[Even this is possible. ] ;W[qk] ;B[ok] ;W[rl] ;B[pl] ;W[qg] ;B[pg] ;W[rf] ;B[rg] ;W[qh] ;B[re] ;W[pf]C[KataGo gives black -3 pp for 49. R8 ] )(;B[kn]C[Black can even just jump. ] ;W[qh] ;B[ql] ;W[qk] ;B[op] ;W[oq] ;B[qq] ;W[qp]C[KataGo gives black -5 pp for 49. L6 ] ))(;W[nj] ;B[mp]C[If white doesn't respond on the bottom side, black will play this. ] ;W[np] ;B[no] ;W[lo] ;B[mo] ;W[lr]C[Black has gained some moves on the outside. ] ;B[qh] ;W[lk] ;B[km] ;W[kp] ;B[rn] ;W[ro]C[KataGo gives white -3 pp for 48. O10 ] ))(;B[no]TR[pj]C[When white makes that shape, I like this move for black, but I had some misunderstandings about it. ] (;W[nj]TR[no]C[Let's say white plays away. O5 apparently has an impact on the corner. How does black make use of that? ] (;B[lp]C[KataGo recommends this move. ] (;W[cc]C[Let's say white plays away again. ] ;B[dc] ;W[be] ;B[or]C[Black has prepared this move. ] (;W[pq]TR[or]C[So white has to respond with this, but the exchange is already good for black. ] ;B[ro]C[Now black can hane and atari. ] ;W[rp] ;B[po] ;W[qp]TR[pp]TR[pq]SQ[or]C[White has created an empty triangle here, and P2 is not dead yet. ] )(;W[oq]C[If white blocks from either side, black will respond with the 3-3. ] ;B[qq] )(;W[nr] (;B[qq]C[Then white is in trouble. ] ;W[qp] ;B[op]C[Black can attach. Now white is in trouble. ] ;W[oq] ;B[pq] ;W[rq] ;B[rr] ;W[rn] ;B[rm] ;W[rp]XX[rm]XX[pn]XX[qn]TR[rn]XX[no]TR[qo]XX[lp]XX[op]TR[pp]TR[qp]SQ[nq]SQ[oq]TR[rq]SQ[nr]C[The point is not kill white on either side, but to exploit the aji to build a wall on the outside. Black can get a lot of forcing moves. ] )(;B[oq]C[Black should not make this exchange. ] ;W[op] ;B[qq] ;W[qp] ;B[rq] ;W[np]C[This really hurts the outside even if black can live in the corner. ] )))(;W[ro]TR[lp]C[So white should defend the corner, otherwise black can bully it. Black is happy with this exchange and can play away. ] ;B[lm]C[Black can play something like this. ] ))(;B[or]C[If black plays here directly, white will respond with the 3-3. ] ;W[qq] (;AB[lp]C[If black had a stone here, black would push and cut. ] ;B[oq] ;W[op] ;B[np]TR[nq]C[O3 is cut off and hence dead. ] )(;B[oq] ;W[op] ;B[np] ;W[mq]TR[lp]C[But without a stone at M4, black is dead. ] )))(;W[lq]C[So white should respond with something like this. ] )(;W[ro] ;B[rn] ;W[qh] ;B[lp] ;W[nk] ;B[ml] ;W[mk] ;B[ll] ;W[lc] ;B[oc] ;W[fb]C[KataGo gives black -1 pp for 47. O5 ] )))(;W[qk]C[If white plays this two-space low pincer, black could cap. ] ;B[ok] (;W[qh] (;B[og]C[Black can run into the center pretty easily like this. Black is happy to allow white to live on the third line with a small territory, so this is not ideal for white. ] )(;B[oi] ;W[nn] ;B[pl] ;W[oh] ;B[nh] ;W[og]C[KataGo gives white -2 pp for 46. R9 ] ))(;W[pl] ;B[ol]C[It looks like black's connection is pretty weak. ] ;W[om] ;B[pm] ;W[nm] ;B[qj]C[But it turns out that this fight is not good for white. ] ;W[rj] ;B[pj] ;W[rl] ;B[ro] ;W[rp] ;B[ri]C[White cannot win this capturing race. ] ))(;W[pk]LB[mn:D]LB[nn:A]TR[pn]TR[qn]LB[mo:C]LB[no:B]C[My understanding is that this move is a bit too close to black's two stones. They should not be treated as a weak group. We will see that in the game. If white plays this two-space high pincer, black could just run into the center with A, B, C or D. ] (;B[mn] ;W[lp]C[White protects the corner. ] ;B[nk] (;W[ol] ;B[nl] ;W[om]C[White cannot cut. ] ;B[po] ;W[qp] ;B[no]C[Black can connect by exploiting white's weakness here. ] )(;W[pg]TR[nk]TR[mn]TR[pn]TR[qn]C[So white has to play something like this. The black group is pretty safe. ] )(;W[ph] ;B[og] ;W[ni] ;B[oj] ;W[pj] ;B[oi] ;W[oh] ;B[pi] ;W[qi]C[KataGo gives white -2 pp for 46. Q9 ] ))(;B[pi]C[Black also has the space to play here. This is where black wants to build territory. ] ))(;W[ql] ;B[qj] ;W[pj] ;B[hg] ;W[dj] ;B[ej] ;W[ek] ;B[dj] ;W[gh] ;B[pi] ;W[oj] ;B[qk] ;W[pl] ;B[pk] ;W[ok] ;B[ol] ;W[rl] ;B[qh] ;W[om] ;B[nl]C[KataGo gives white -3 pp for 46. R8 ] ))(;B[nc] ;W[be] ;B[bd] ;W[bn]C[If black does not extend, this move is quite big. ] ;B[ai]C[This move does not make two eyes, so this group can be harassed. ] )(;B[hg] (;W[gh]C[Taking directly isn't bad, but white wouldn't play it immediately. ] (;B[dn] ;W[dj]TR[di]TR[ei]C[Black may not respond to this now. Black can give up the two stones. ] )(;B[bo] ;W[bp] ;B[qp] ;W[qq] ;B[do] ;W[cp] ;B[rq] ;W[qo] ;B[rp] ;W[ro] ;B[po] ;W[rn] ;B[pq] ;W[op] ;B[pn] ;W[qm] ;B[pr] ;W[pl] ;B[nn] ;W[no] ;B[pm] ;W[ql] ;B[ol]C[KataGo gives black -1 pp for 43. H13 ] ))(;W[dj]LB[gh:B]TR[di]TR[ei]LB[ej:A]C[Instead, white would throw in. Now, black doesn't want to give up the two stones. White has to get either A or B to secure the connection. Apparently, A is bigger. ] (;B[ej] ;W[ek] ;B[dj] ;W[gh]C[Now white would come back to take the stones. ] ;B[dn] ;W[bl]C[This move is sente now. ] (;B[dl] )(;B[aj] ;W[bn]C[This move can sort of connect (but not solidly). ] ))(;B[dn] ;W[ej]TR[di]TR[ei]C[By taking the two stones, white connects. ] )))(;B[pj] (;W[dj]C[Black may not respond to this now. ] ;B[dn] )(;W[bn] ;B[gq] ;W[dj] ;B[bm] ;W[dn] ;B[cm] ;W[bo] ;B[aj]C[KataGo gives black -9 pp for 43. Q10 ] )))(;B[gg]C[If black connects now, white can gain some stones outside and live on the side. ] ;W[ek] ;B[dj] (;W[bh]TR[di]TR[ei]TR[cj]TR[dj]TR[bk]TR[ck]TR[dk]TR[cn]C[Black's shape looks bad. There's no eye. ] )(;W[bg] ;B[dl] ;W[co]C[KataGo gives black -23 pp for 39. G13 ] )))(;W[gg] (;B[fj]TR[fg]TR[fh]C[If white captures the two stones directly, it gives black this pleasant atari. ] )(;B[jc] ;W[co] ;B[fj] ;W[gi] ;B[qp] ;W[qq] ;B[rq] ;W[qo] ;B[rp] ;W[ro] ;B[po] ;W[rn] ;B[pq] ;W[op] ;B[pn] ;W[qm]C[KataGo gives white -7 pp for 38. G13 ] )))(;W[ge]C[White can also just push, that's a good move too. ] ;B[hd]TR[gf]TR[fg]TR[fh]C[White can capture the three stones in the center. It's the same idea. ] ;W[cc] ;B[dc] ;W[be] ;B[kc] ;W[co] ;B[dn] ;W[fj] ;B[ek] ;W[ql] ;B[qj] ;W[ol] ;B[if] ;W[hf] ;B[oj]C[KataGo gives white -2.5 pp for 36. G15 ] ))(;B[ge] (;W[gg] ;B[gh] ;W[hg]C[If black just blocks, there are just too many cutting points outside for black to handle. ] ;B[gi] ;W[gd]C[This is gonna be a disaster for black. ] )(;W[gd] ;B[fc] ;W[gg] ;B[gh] ;W[hg] ;B[qp] ;W[qq] ;B[rq] ;W[qo] ;B[rp] ;W[po] ;B[ro] ;W[cc] ;B[dc] ;W[be] ;B[bd] ;W[cd] ;B[de]C[KataGo gives black -34 pp for 35. G15 ] )))(;B[gh]TR[ff]C[It looks like black could play this extend, but that's not ideal because after the F14 jump, white cannot be easily blocked by black. ] ;W[be] ;B[bd] ;W[bg]TR[fi]C[Now white can go back to live on the side, and F11 is pretty annoying for black (the ladder doesn't work). ] (;B[fk]TR[ff]C[So black has to play something like this to protect the weakness. Thanks to F14, it's not easy to block white. ] ;W[qo] ;B[gf]C[Black could try something like this. ] ;W[ge] ;B[fe] ;W[hf] ;B[gg] ;W[he]C[But white could make use of the aji to get some stones outside. ] )(;B[gf] ;W[kc] ;B[qp] ;W[qq] ;B[rq] ;W[qo] ;B[rp] ;W[po] ;B[ro] ;W[co] ;B[dn] ;W[ek] ;B[fj] ;W[gi] ;B[el] ;W[hh] ;B[hg] ;W[hi]C[KataGo gives black -7 pp for 31. G12 ] )))(;W[bh]SQ[ch]TR[fh]C[White could answer the cut by capturing this stone to make eyes on the side. ] ;B[fg]TR[ch]C[If white captures that stone, black can get this extend. ] (;W[fj] ;B[dg] ;W[cg] ;B[eg] ;W[ch]C[Black can get two ataris for free. ] ;B[ek] ;W[fe]TR[hc]SQ[dd]SQ[fd]SQ[ce]TR[cf]TR[df]TR[cg]TR[bh]TR[ch]TR[dh]TR[eh]TR[bi]TR[ci]TR[fi]TR[bj]XX[cj]TR[fj]XX[bk]XX[ck]XX[dk]XX[ek]TR[cl]XX[cn]C[We'll end up with something like this intense fight. No white stone in this area is completely alive. Black at least has enough eye-space in the corner and some eye-space on the side. ] )(;W[bl] ;B[dl] ;W[dm] ;B[al] ;W[cm] ;B[dg] ;W[cg] ;B[eg] ;W[ch] ;B[fk] ;W[gi] ;B[hh] ;W[ej] ;B[dj] ;W[hi] ;B[bf] ;W[fe]C[KataGo gives white -6 pp for 30. B12 ] ))(;W[fg]C[If white wants to run into the center, this atari looks like the natural move, but it's a typical vulgar move. ] ;B[gh] ;W[gg] (;B[hh]SQ[eg]TR[fg]C[F13 leaves the E13 atari, so it's actually a slow move. ] ;W[ee]C[If white wants to fix with this peep, it actually helps black. ] (;B[ed]C[Even just connecting is good enough for black. ] )(;B[fc]C[Or maybe this? ] ))(;B[bh] ;W[be] ;B[bd] ;W[hg] ;B[fj] ;W[bg] ;B[eg] ;W[dg] ;B[aj]C[KataGo gives white -7 pp for 30. F13 ] ))(;W[fe]C[I'm not sure if the attach is good. ] (;B[gd]C[I don't think so, though, because black can just extend. White looks a little broken while black is solidly connected. ] )(;B[bh]C[KataGo gives white -10 pp for 30. F15 ] )))(;B[bh]C[In game 74, black will continue here instead. ] ))(;W[be]C[My KataGo recommended this. ] ;B[bd] ;W[bg]C[Hane and tiger. ] ;B[fh] ;W[fg] ;B[jc] ;W[ge] ;B[ie] ;W[he] ;B[gc] ;W[hb] ;B[id]C[KataGo gives white -3 pp for 28. B15 ] )(;W[gg]C[You can also play something like this to run into the center. ] ;B[fh] ;W[fg] ;B[bh] ;W[fi] ;B[bf] ;W[fj] ;B[ek] ;W[qo] ;B[pn] ;W[pj] ;B[mn]C[KataGo gives white -3.5 pp for 28. G13 ] ))(;W[bh]TR[bj]SQ[bk]C[If you play at B10 as white, you've lost the chance to play B9. ] ;B[fh] ;W[fi] ;B[fg] ;W[bl] ;B[dg] ;W[cg] ;B[eg] ;W[cl] ;B[ck] ;W[ak] ;B[dl] ;W[dm] ;B[cm] ;W[ch] ;B[cp] ;W[gi] ;B[bm] ;W[al] ;B[aj] ;W[ai] ;B[am] ;W[aj] ;B[do] ;W[em] ;B[fk] ;W[fl] ;B[el] ;W[ej] ;B[fm] ;W[gl] ;B[en] ;W[dj] ;B[dn] ;W[db] ;B[gc] ;W[ec] ;B[ed] ;W[gb] ;B[cb] ;W[cc] ;B[dc] ;W[bb] ;B[hd] ;W[id]C[KataGo gives white -2 pp for 26. B12 ] )(;W[fh] ;B[bh]TR[bi]TR[ci]TR[bj]SQ[bk]C[Black can capture the three stones thanks to B9. ] ;W[be] ;B[bd] ;W[fb]C[KataGo gives white -16.5 pp for 26. F12 ] ))(;B[cl]C[If black doesn't block, there is no weakness inside white's territory, apparently. ] ;W[fh]C[White basically almost lives locally. That's too good. ] ))(;W[bh]TR[ch]LB[bj:A]LB[bk:B]C[I wanted to play this, which is a playable move as well for amateurs like me, but KataGo thought it was a little unsatisfying. The reason that I wanted to play it is that in the future, as white I might want to play at B instead of A. If you capture C12 directly like this, in the future, you either crawl or jump next. (all comments on this game by terrific, OGS 5d). ] (;B[fi] (;W[bj] (;B[bk]C[Black wouldn't crawl in this case. It allows white to peep here. ] ;W[cl] ;B[ck]C[This leaves some aji in black's influence. ] (;W[cm]TR[di]TR[ei]TR[fi]TR[cj]TR[bk]TR[ck]TR[dk]SQ[cn]C[For example, white could play here to threaten to separate the two groups. ] )(;W[bl]C[White can also clamp. ] )(;W[co]TR[cn]C[White could kick, too. Then C6 is very weak. ] ))(;B[cl]TR[cn]C[Black would just tiger instead to secure the connection. The C6 stone is pretty strong now. ] ))(;W[bk] ;B[cl]C[In this case, too, black would just kosumi to secure the connection. ] ))(;B[fh] ;W[ge] ;B[fe] ;W[ff] ;B[gf] ;W[gg] ;B[hf] ;W[fg] ;B[eg] ;W[dg] ;B[kc] ;W[jd] ;B[kd] ;W[jf] ;B[hd] ;W[hg] ;B[jc] ;W[co] ;B[dn]C[KataGo gives white -4 pp for 24. B12 ] )))