(;FF[4]
CA[UTF-8]
GM[1]
GN[KataGo 7 komi self-play - game 10]
PC[https://online-go.com/review/456362]
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]LB[fc:A]LB[ce:B]TR[cf]LB[df:C]C[In the actual game, white tenuki'd. Now the question is, how does black attack C14? There are three options I can think of: enclosure, kick, or attach from the top (all comments on this game by terrific, OGS 5d).]
;B[ce]
(;W[df]
;B[fd]
(;W[dh]
;B[di]
;W[eh]
;B[cn]
(;W[hc]TR[ci]C[In the actual game, white pincered the corner from the other side. So that means both players thought this cut is nothing to worry about. This is sort of interesting to me.]
;B[ei]
(;W[fi]
(;B[ck]TR[ci]MA[cj]SQ[cn]C[This keima is an interesting shape. It looks like AIs play this keima a lot in order to protect the cut. The connection to C6 is more solid than with the tiger's mouth at C10.]
;W[gh]
;B[fg]
(;W[fh]C[There's nothing wrong with connecting, apparently.]
;B[hd]
;W[id]
;B[he]
(;W[ic]TR[gb]C[This move looks a bit slow. As a human, I want to play the kosumi instead.]
(;B[gb]
(;W[mc]TR[cf]TR[df]SQ[ff]SQ[bh]TR[dh]TR[eh]TR[fh]TR[gh]LB[ih:B]TR[fi]LB[fk:A]MA[qn]
;B[qp]
;W[qq]
;B[rq]
;W[qo]
;B[rp]
;W[po]
;B[ro]
;W[qr]
(;B[pn]LB[on:A]LB[no:B]TR[po]TR[qo]LB[kp:C]TR[pp]
(;W[ql]LB[rm:A]
;B[qi]
(;W[dl]
;B[cl]
;W[ol]
;B[nn]
;W[lp]
;B[mm]
;W[pi]
;B[qh]
;W[mk]
;B[km]
;W[ln]
;B[lm]
;W[jn]
;B[jk]TR[mk]
(;W[pj]SQ[cf]SQ[df]SQ[dh]SQ[eh]SQ[fh]SQ[gh]SQ[fi]TR[pi]MA[jk]TR[mk]TR[ol]TR[ql]MA[km]MA[lm]MA[mm]MA[nn]MA[pn]MA[qn]MA[ro]MA[qp]MA[rp]MA[rq]
;B[oc]
;W[il]
;B[kn]
(;W[ko]
;B[ld]MA[pi]MA[pj]SQ[jk]MA[mk]TR[il]MA[ol]MA[ql]SQ[km]SQ[lm]SQ[mm]SQ[kn]SQ[nn]SQ[pn]SQ[qn]SQ[ro]SQ[qp]SQ[rp]SQ[rq]
;W[lc]
;B[md]
;W[kd]
;B[ke]LB[lj:B]LB[lk:A]
;W[lj]
;B[jl]
;W[im]
;B[kc]
;W[kb]
;B[jd]
;W[ie]
;B[rm]
;W[ng]
(;B[gq]TR[jb]C[Black doesn't really have to live here. Black is just trying to create trouble for white. I think black is aiming for the ko, too.]
;W[gp]
;B[fr]
;W[eq]
;B[hq]
;W[jr]
;B[ki]
;W[pg]TR[ki]
(;B[np]
(;W[oq]
;B[jq]
;W[kr]
;B[er]
;W[dr]
;B[io]
;W[jo]
(;B[go]
;W[hp]
(;B[mh]
;W[qg]TR[mh]
;B[cr]
;W[ds]
;B[rg]
;W[rf]
;B[rh]
;W[mi]
;B[if]
;W[re]
;B[gc]
;W[qd]
;B[ph]
;W[og]
;B[rk]
;W[pe]TR[mi]TR[pi]TR[lj]TR[pj]TR[mk]TR[ol]TR[ql]
;B[nc]
;W[jc]
;B[je]
(;W[dn]TR[fm]TR[gm]TR[hm]TR[fn]TR[gn]TR[hn]TR[eo]TR[fo]TR[go]SQ[cr]C[White got sente to come back to the bottom. We didn't count this area for white originally, but now white is building territory here, so black lost something in this area. In exchange, black got the C2 move, so black can take the corner.]
;B[ek]TR[dh]TR[eh]TR[fh]TR[gh]TR[fi]
;W[ja]
(;B[co]
;W[fn]
;B[la]
;W[mb]
;B[ha]
(;W[kd]
;B[cq]
;W[dq]
;B[nb]
;W[pb]
(;B[pc]C[Very deep reading here.]
(;W[ma]
;B[ib]
;W[qb]
;B[na]
;W[dk]
;B[ej]
;W[cm]
;B[bm]
;W[dm]
;B[cj]
(;W[bf]
;B[be]
;W[gk]
;B[hi]
;W[hf]
;B[ig]
;W[hh]
;B[ii]
;W[ee]
;B[fe]
;W[bh]
;B[oh]
;W[nh]
;B[oi]
;W[ed]
;B[ec]TR[ni]
(;W[rl]
;B[sl]
;W[cp]
;B[gj]
;W[fj]
(;B[bp]
;W[le]
;B[kc]
;W[dc]
;B[cc]
;W[db]
;B[cb]
;W[eb]
;B[fc]
;W[kd]
;B[fk]
;W[cg]
;B[ci]
;W[ff]
;B[kc]
;W[rj]
;B[qj]
;W[kd]
;B[gf]
;W[ef]
;B[kc]
;W[bq]
;B[bo]
;W[kd]
(;B[qc]
;W[rc]
;B[kc]
;W[qk]
;B[sk]
;W[kd]
;B[sd]
;W[rd]
;B[kc]
;W[sm]
;B[sn]
;W[kd]
;B[lf]
;W[me]
;B[kc]
;W[sj]
;B[sm]
;W[kd]
;B[nd]
;W[hg]
;B[kc]
;W[ih]
;B[kd]
;W[jh]
;B[kg]
;W[ni]
;B[oj]
;W[nl]
;B[nj]
;W[kk]
;B[gl]
;W[hk]
;B[fm]TR[br]
(;W[kh]TR[kc]TR[jd]TR[kd]TR[je]TR[ke]TR[if]TR[lf]TR[ig]TR[kg]MA[hi]MA[ii]MA[ki]MA[gj]MA[jk]MA[jl]MA[km]MA[lm]MA[mm]MA[kn]MA[nn]SQ[on]
(;B[br]TR[dk]TR[dl]TR[cm]TR[dm]TR[dn]TR[fn]SQ[gn]TR[cp]TR[dp]TR[gp]TR[hp]TR[dq]TR[eq]TR[fq]TR[dr]TR[ds]
(;W[gn]C[The AI thinks that if white doesn't fix this, it's a disaster. I trust the AI.]
;B[ik]
;W[hl]
;B[oo]
;W[pk]
;B[gm]
;W[hm]
;B[do]
;W[eo]
;B[ip]
;W[fp]
;B[rb]
;W[ra]
;B[hn]
;W[em]
;B[fl]
;W[ho]
;B[jm]
;W[hj]
;B[rr]
;W[rs]
;B[bi]
;W[ae]
;B[ad]
;W[af]TR[cd]
;B[cd]
;W[ji]
;B[ij]
;W[gi]
;B[jg]
;W[lg]
;B[mf]
;W[ne]
;B[nf]
;W[oe]
;B[kl]
;W[kj]
(;B[pq]
;W[pr]
;B[mg]
;W[lh]
;B[op]
;W[pq]
(;B[qs]C[It seems like this move doesn't achieve anything, but it's not a loss.]
;W[mn]
;B[mp]
;W[mq]
;B[nm]
;W[ac]
;B[bd]
;W[kf]
;B[jf]
;W[de]
;B[bb]
;W[ai]
;B[lq]
;W[kq]
;B[aj]
;W[om]
;B[on]
;W[of]
;B[kf]
;W[ah]
;B[gg]
;W[bs]
;B[ag]
;W[bg]
;B[es]
;W[ir]
;B[gs]
;W[hr]
;B[in]
;W[gj]
;B[lr]
;W[ar]
;B[aq]
;W[lo]
;B[ss]
;W[ps]
;B[kp]
;W[jp]
;B[mr]
;W[nr]
;B[os]
;W[rs]
;B[as]
;W[cs]
;B[qs]
;W[ls]
;B[sg]
;W[ar]
;B[mo]
;W[iq]
;B[as]
;W[ge]
;B[gd]
;W[ar]C[White 96 % (KataGo)

-- chat --
Maharani: Video review by terrific, OGS 5d: https://youtu.be/ZtGfqeBA-ko
Maharani: https://youtu.be/4nJG3sqoe9M
Maharani: Woops second link is for another game, please disregard
]
)(;B[mq]
;W[mp]
(;B[mr]
;W[nr]
(;B[os]
;W[lq]
)(;B[qs]
;W[ps]
;B[sr]
;W[lq]
))(;B[mn]
;W[lo]
;B[ah]
;W[kf]
;B[jf]
;W[of]
;B[kf]
;W[ag]
;B[bg]
;W[gg]
;B[cs]
;W[bh]C[KataGo gives black -17.4 pp for 259. N3]
)))(;B[op]
;W[pq]
(;B[mp]
;W[mq]
;B[mo]
;W[lo]SQ[no]TR[lq]TR[lr]TR[mr]TR[nr]TR[or]TR[pr]TR[ls]TR[ms]TR[ns]TR[os]TR[ps]C[Let's say black plays this way. White has 11 points on the bottom and black has 1 point, so basically white has 10 points.]
)(;B[mg]
;W[lh]
;B[gg]
;W[de]
;B[ac]
;W[kf]
;B[jf]
;W[of]
;B[kf]
;W[ai]
;B[aj]
;W[ah]
;B[cs]
;W[mp]
;B[mn]
;W[lo]
;B[sf]
;W[sg]
;B[sh]
;W[se]
;B[eg]
;W[mo]
;B[qm]
;W[oa]
;B[lb]C[KataGo gives black -0.5 pp for 253. P4]
)))(;W[on]C[Let's say white just wedges. What could black do?]
(;B[om]
;W[nm]
;B[oo]
;W[mn]
)(;B[li]C[Maybe black can play this first?]
;W[lh]
;B[jj]
;W[mj]
)(;B[hl]
;W[ik]
;B[in]
;W[jm]
;B[ip]TR[dk]TR[dl]TR[cm]TR[dm]TR[dn]TR[fn]TR[cp]TR[dp]TR[gp]TR[hp]TR[dq]TR[eq]TR[fq]TR[dr]TR[ds]C[So white is in trouble in this area. I can't see clearly who will win here, but I trust the AI.]
)(;B[ip]
;W[gn]
;B[hn]
;W[fo]
;B[fp]
;W[ep]
;B[ho]
;W[gm]
;B[hm]
;W[hl]
;B[fl]
;W[ir]
;B[fp]
;W[gp]
;B[do]
;W[gr]
;B[hr]
;W[en]
;B[gs]
;W[es]
;B[eo]
;W[fp]C[KataGo gives white -12.7 pp]
)))(;B[li]C[This is sente.]
(;W[mj]
)(;W[lh]
;B[jj]
;W[mj]
)(;W[ji]
;B[gn]
;W[on]
;B[lh]
;W[mj]
;B[om]
;W[oo]
;B[pl]
;W[nm]
;B[ip]
;W[br]C[KataGo gives black -15 pp for 215. M11]
)))(;W[br]
;B[gn]
;W[ip]
;B[li]
;W[mj]
;B[ji]
;W[ae]
;B[ad]
;W[af]
;B[cd]
;W[ak]
;B[al]
;W[aj]
;B[en]
;W[do]C[KataGo gives white -23.5 pp for 214. B2]
))(;B[br]C[KataGo gives black -24.4 pp for 181. B2]
;W[kc]C[White can just connect to eliminate the ko. This is painful enough for black, isn't it? White has four liberties.]
;B[nd]
;W[hg]
;B[jf]
;W[hb]
;B[ia]
(;W[fa]
)(;W[ge]
;B[gd]
;W[fa]
;B[fb]
)))(;B[fk]C[What if black just cuts, what will happen?]
(;W[cg]C[This white group is actually alive.]
;B[ci]C[Let's say black connects.]
(;W[ff]
;B[gf]
;W[ef]
;B[gg]
;W[eg]
)(;W[ge]C[Maybe white can do better.]
;B[gd]
;W[ff]
;B[gf]
;W[ef]
;B[gg]
;W[eg]
;B[bi]
;W[hg]
;B[ge]
;W[dc]C[This is kind of severe. That's wild. Really deep reading.]
))(;W[bi]
;B[ci]
;W[bj]
;B[bk]
;W[bo]
;B[bn]
;W[bp]
;B[gl]
;W[hk]
;B[fl]
;W[cg]
;B[ag]
;W[ff]
;B[gf]
;W[eg]
;B[ef]
;W[ih]
;B[jh]
;W[ff]
;B[af]
;W[de]
;B[cd]
;W[bg]C[KataGo gives black -22.5 pp for 157. F9]
)))(;W[le]
(;B[kc]
;W[cp]
;B[ni]
;W[lh]
;B[mg]
;W[mf]C[White has the ladder in this case.]
;B[li]
;W[lg]
;B[nj]
;W[mj]
;B[nk]C[But black can capture something, I think.]
)(;B[lf]
;W[rl]
;B[qk]
;W[pk]
;B[pm]
;W[pl]
;B[sl]
;W[me]
;B[nd]
;W[ni]
;B[cg]
;W[gj]
;B[cp]
;W[el]C[KataGo gives white -3.2 pp for 152. M15]
)))(;W[cp]
(;B[bp]
;W[bq]TR[pc]C[White can push and cut here. I didn't take this into account when I counted the game earlier. That's why Q17 really mattered.]
)(;B[gj]
;W[hf]
;B[hg]
;W[gf]
;B[ig]
;W[gg]
;B[cg]
;W[hj]
;B[hk]
;W[jh]C[KataGo gives white -19.3 pp for 136. C4]
)))(;W[qc]
;B[qb]
(;W[rb]C[By playing this, white cannot connect on the first line anymore.]
(;B[lf]C[Maybe black can fix the cut.]
;W[ma]
;B[ib]C[If white plays like this, black can kill from the other side.]
;W[na]
;B[oa]C[White cannot connect.]
)(;B[ne]TR[ja]TR[kb]TR[mb]TR[hc]TR[ic]TR[jc]TR[lc]TR[mc]TR[id]TR[kd]TR[ie]C[Actually, black can fix THIS way. White's group has died unconditionally. To make matters worse, black has sort of fixed the aji outside.]
;W[ma]C[This descend is no longer sente.]
;B[ib]C[Black can destroy the eye on the left side.]
;W[na]C[This first-line connect doesn't work anymore.]
;B[oa]
;W[pa]
;B[ob]
))(;W[nd]
;B[kc]
;W[rl]
;B[sl]
;W[od]
;B[pa]
;W[kd]
;B[me]
;W[nf]
;B[kc]
;W[sm]
;B[sn]
;W[kd]
;B[hf]
;W[rb]
;B[ob]
;W[ra]
;B[qa]
;W[ma]
;B[na]
;W[dk]
;B[dj]
;W[dm]
;B[fj]
;W[gj]
;B[gk]
;W[hj]
;B[hk]
;W[ih]
;B[ik]
;W[bh]C[KataGo gives white -2.5 pp for 126. R17]
)))(;B[ma]SQ[pb]TR[nd]TR[le]TR[jf]C[What if black just draws the stone back? There's some aji around this ko. There are so many cut points, which is unpleasant for black. With this aji, white can bully black to get some more points, so that way black is not able to win the ko, I think. Q18 is already making some territory for white in the corner. White also got sente. This is enough to compensate for white's loss in the ko, so it's not a happy position for black.]
(;W[nd]C[I don't know. It seems the ko is hard for white to fight, too.]
)(;W[le]
(;B[jf]
;W[nd]
)(;B[kc]
;W[dk]
;B[do]
;W[dm]
;B[eo]
;W[fo]
;B[en]
;W[fm]
;B[cm]
;W[ci]
;B[cj]C[KataGo gives black -14.7 pp for 125. N19]
))(;W[qb]
;B[pc]CR[qb]TR[pc]C[In the game, black made this exchange, which makes a difference.]
)(;W[pc]C[This atari is double sente for white.]
(;B[aa]
;W[nd]
;B[kc]
;W[lb]C[It's not even a ko, black is just dead.]
;B[jb]
;W[ib]
;B[ia]
;W[oa]
;B[hb]C[Actually there's still some ko, but that ko is free for white.]
)(;B[ne]C[So black has to respond.]
)(;B[nd]C[That's very pleasant for white. It's a lot of points.]
))))(;W[ib]C[White can play this to make the ko. But why doesn't white proceed this way? Does white not have a suitable ko threat? Or maybe it's too passive. This position is very hard for me. I think even for professionals it would not be an easy position. Each side is trying to win the ko with enough profit. Maybe white doesn't have enough points even if it wins the ko this way.]
(;B[cq]
;W[dq]C[Black also has a lot of ko threats on the bottom.]
;B[kq]
(;W[ia]
;B[lq]
;W[lr]
;B[mq]
;W[mr]
;B[mp]
)(;W[iq]C[It looks like this wedge can cut black off.]
(;B[ip]
;W[ir]
;B[fp]
;W[gr]
;B[ho]
;W[hr]C[I don't know, actually. This is complicated. It looks like black can save some stones here, but is that enough to compensate for black losing the ko?]
)(;B[fp]C[This is a good ko threat, I think.]
;W[rr]
;B[ip]C[If white ignores it, black can capture the two stones.]
)))(;B[pb]
;W[nb]
;B[gj]
;W[fj]
;B[fk]
;W[gk]
;B[hj]
;W[ci]C[KataGo gives white -4.3 pp for 120. J18]
)))(;B[mb]C[Is this alive?]
(;W[lb]
(;B[nb]C[Locally, white is dead, I think.]
(;W[kd]
;B[la]
;W[jf]C[But it's still some sort of ko because of black's weaknesses. There are so many cuts outside.]
)(;W[la]
;B[ha]C[Actually, it's a ko even locally. This a common tesuji here.]
(;W[ib]
;B[ia]
;W[kd]C[It's a ko for life.]
)(;W[ia]
;B[ib]C[If white bamboos, this wedge kills.]
)))(;B[ob]
;W[ma]
;B[nb]
;W[hf]
;B[co]
;W[la]
;B[ha]
;W[kd]
;B[cq]
;W[dq]
;B[ib]C[KataGo gives black -10.3 pp for 115. N18]
))(;W[kd]
;B[lb]
;W[kc]C[This would be dead locally.]
)))(;W[ja]C[This cannot live.]
(;B[ha]
;W[ia]
;B[ib]
)(;B[mb]
;W[lb]
;B[nb]
)(;B[ib]
;W[hb]C[KataGo gives white -6.1 pp for 112. K19]
))(;W[nb]C[How about the hane?]
;B[ob]C[White is not completely dead.]
(;W[mb]
(;B[la]
;W[kd]C[This is a ko, isn't it?]
;B[na]
;W[ma]
;B[hb]
;W[ib]C[Yes, it's a ko.]
)(;B[hb]C[This seems to be a ko, too.]
;W[la]
;B[jb]
;W[na]
;B[ib]C[Black can kill half of the group.]
))(;W[dn]
;B[co]
;W[mb]
;B[ja]
;W[cp]
;B[cq]
;W[dq]
;B[bp]C[KataGo gives white -26.1 pp for 112. O18]
)))(;B[ip]C[What happens if black blocks? I think we're gonna see in the game.]
;W[fo]
;B[cr]
;W[ds]
;B[mh]
;W[qg]
;B[rg]
;W[rf]
;B[rh]
;W[re]
;B[ph]
;W[oh]
;B[pf]
;W[og]
;B[rd]
;W[qe]
;B[pe]
;W[qd]
;B[qc]
;W[rc]
;B[sd]C[KataGo gives black -3.5 pp for 93. J4]
))(;B[ir]C[Apparently, black doesn't have enough space to live here. KataGo gives black -18.6 pp for 91. J2]
(;W[hp]
;B[jp]
)(;W[go]C[White can even tenuki.]
;B[hp]
;W[jp]
)))(;W[mq]C[If you play this now, black can hane to reduce white's territory.]
(;B[oq]
;W[pq]
;B[op]
;W[or]C[If white pulls black like this, maybe black won't continue around K3.]
;B[jq]C[I don't know.]
)(;B[mh]
;W[qg]
;B[rg]
;W[ph]
;B[re]
;W[mi]
;B[cq]
;W[er]
;B[cp]
;W[dn]C[KataGo gives white -8 pp for 84. N3]
)))(;B[jq]
(;W[mq]C[Let's say white had this stone.]
;B[np]C[White can tenuki from this. Maybe that's the reason?]
)(;W[kr]
;B[io]
;W[gm]
;B[jo]
;W[er]
;B[go]
;W[fo]
;B[mh]
;W[qg]
;B[rg]
;W[rf]
;B[rh]
;W[mg]
;B[hp]
;W[re]
;B[ph]
;W[oh]
;B[pf]
;W[og]
;B[rd]C[KataGo gives black -1 pp for 83. K3]
))(;B[hb]C[Black can reduce white's eye-space this way.]
))(;B[oh]C[Aren't you worried about the elephant eye?]
;W[ph]C[It seems that black cannot play it immediately.]
(;B[og]
;W[pg]
;B[of]
;W[qg]
;B[rg]
)(;B[pg]
;W[og]
;B[mh]
;W[nh]
;B[mi]
;W[ni]
;B[mj]
;W[nj]C[KataGo gives black -25.4 pp for 75. P12]
))(;B[jb]
;W[jc]
(;B[lb]C[Black can make this ko, apparently.]
(;W[kd]
;B[cp]
;W[je]C[If you make this ko right away, there is no ko threat for black.]
;B[cq]C[If black loses this ko, it's a disaster.]
)(;W[ka]C[White has this local ko threat, too. Black cannot fight this ko.]
))(;B[jo]
;W[io]
;B[jp]
;W[ip]
;B[lb]
;W[kd]
;B[kp]
;W[lo]
;B[kc]C[KataGo gives black -20.4 pp for 75. K18]
))(;B[bp]
(;W[cq]TR[in]TR[ho]TR[io]TR[gp]TR[hp]TR[ip]TR[jp]TR[gq]TR[hq]TR[iq]TR[jq]TR[gr]TR[hr]TR[ir]TR[jr]TR[gs]TR[hs]TR[is]TR[js]C[Let's assume this exchange. We can count 65 points of territory for black. It's a pretty close game if the bottom side remains a white territory.]
)(;W[dn]
;B[co]
;W[do]
;B[jo]
;W[jp]C[KataGo gives black -15.4 pp for 75. B4]
)))(;W[jo]TR[ln]C[If white extends at K5, black reduces more territory. Black can capture M6 at any time, which secures an eye, so for now we can say black has half an eye.]
(;B[ko]
;W[kp]
)(;B[im]
;W[jm]
;B[jl]
;W[pg]
;B[ph]
;W[oh]
;B[og]
;W[nh]
;B[gq]
;W[gp]
;B[eq]
;W[fp]
;B[fr]
;W[gr]
;B[dr]
;W[fs]
;B[er]
;W[hq]C[KataGo gives white -1.2 pp for 60. K5]
)))(;W[jm]
(;B[lk]TR[jm]C[If white pushes, black can attach.]
)(;B[kn]
;W[jo]
;B[pj]
;W[lj]
;B[ki]
;W[jl]C[KataGo gives white -7.2 pp for 56. K7]
)))(;W[qj]C[Interestingly, by the time KataGo decides on 39. bQ6, the sequence it foresees is quite different from the "running through the dame" seen in the actual game.]
;B[pj]
;W[dl]
;B[cl]
;W[pi]
;B[oj]
;W[pk]
(;B[rm]
(;W[nl]TR[rm]TR[pn]TR[qn]TR[ro]TR[qp]TR[rp]TR[rq]C[Black has pretty good eye-space.]
(;B[oi]C[This atari is something we can learn.]
;W[ph]
;B[rj]TR[ph]TR[oi]SQ[rk]C[After this exchange, the ko would become heavier for white.]
(;W[qk]
;B[qh]
;W[pg]
;B[qg]
;W[nh]
;B[mi]
;W[on]
;B[pq]
;W[no]
)(;W[rk]
;B[qk]
;W[pc]
;B[qj]
;W[qc]TR[ph]TR[oi]C[This exchange is a great loss for white.]
))(;B[rj]TR[qj]TR[pk]TR[ql]C[Atari'ing now is not a good idea. The three stones are not very useful for white.]
;W[rk]C[White can make this ko, which is really light for white but heavy for black.]
(;B[oi]C[If you atari now, white can start the ko.]
(;W[ri]
)(;W[ph]C[White would not run out this stone.]
))(;B[qk]
;W[bp]
;B[qj]C[Let's say black wins this ko.]
;W[ph]
;B[oi]CR[ph]TR[oi]C[This exchange is definitely good for black. It does nothing good for white.]
)))(;W[qh]TR[rm]C[S7 sort of prevents this atari.]
;B[ri]
;W[rh]
;B[rj]
;W[qk]
;B[rk]
;W[rl]
;B[sl]C[Even though connecting on the first line always looks ugly, white is broken, which is uglier.]
))(;B[rj]C[As a human player, I really want to atari now. It seems pleasant but actually isn't.]
(;W[qk]C[White's shape is kind of stupid, but it's strong in this position.]
;B[qh]
)(;W[rm]
;B[rn]
;W[rk]C[Can white do something like this? I feel like this makes more sense maybe. This is a better position for white.]
)))(;W[ol]C[As an amateur player, my intuition is jumping out.]
)(;W[rm]
;B[rn]TR[rm]SQ[pn]SQ[qn]SQ[ro]SQ[qp]SQ[rp]SQ[rq]C[Once white has peeped, black is connected and has many liberties.]
;W[ol]
)(;W[on]TR[rm]SQ[pn]SQ[qn]TR[rn]C[This hane isn't good shape, but white wants to keep the choice of playing it.]
))(;W[kp]
(;B[nn]TR[kp]C[If white expands on the bottom side, I think this jump is good enough. Black can extend on the other side.]
)(;B[pj]
;W[ol]
;B[pl]
;W[on]
;B[ok]C[KataGo gives white -9 pp for 40. L4]
)))(;B[ql]C[KataGo's second choice. Black 50.5 % (-0.3 pp) at 50,370 playouts (out of 347,492).]
;W[om]
;B[oc]
;W[ej]
;B[ld]
;W[lc]
;B[kc]
;W[kd]
;B[ke]
;W[jd]
;B[md]
;W[kb]
;B[dj]
;W[ek]
;B[jp]
;W[qg]
;B[pg]
;W[ph]
;B[qh]
))(;W[cc]
;B[be]
(;W[eb]TR[gb]SQ[fc]C[G18 leaves more space for white to do something in the corner than previous variations in which black had a stone at F17.]
)(;W[gc]
;B[fc]C[KataGo gives white -4 pp for 30. C17]
)))(;B[sa]LB[fb:C]LB[cc:A]LB[ec:B]C[Let's say black doesn't protect the corner. White can 3-3, white can peep and white can keima.]
(;W[cc]
;B[be]
)(;W[ec]
)(;W[fb]
)))(;W[gc]C[Let's take some time to look at this move.]
(;B[fc]TR[gc]TR[hc]LB[kc:A]TR[id]LB[kd:B]C[The most natural move for black is blocking, which is really big. If black pincers from A or B next, white's group isn't in a good position.]
(;W[kc]TR[fc]CR[gc]CR[hc]TR[hd]CR[id]LB[jd:A]TR[he]C[Let's say white plays something like this. This small battle on the top doesn't really benefit white very much. White played four moves here and black played three. The corner group is still pretty safe for black. White has ten points of territory and there isn't a lot of room to expand. There is also a clamp at A.]
;B[sa]
;W[cc]
;B[be]
;W[eb]
;B[fb]
;W[ec]C[In the future, maybe white has something like this, but it's not realistic at this point because black can run into the center.]
)(;W[lc]
;B[qp]
;W[qq]
;B[rq]
;W[pr]
;B[ro]
;W[po]
;B[pl]
;W[ej]
;B[dj]
;W[ek]
;B[nc]
;W[qj]
;B[kd]
;W[kc]
;B[jd]C[KataGo gives white -4 pp for 28. G17]
))(;B[kd]C[Let's say you pincer from the other side instead of blocking.]
;W[eb]C[After this keima, white has eye-space on the top side and black's territory is reduced. Black is sort of rootless.]
;B[cc]C[If black wants to live in the corner, black has to play something like this. That is too bad.]
))(;W[gb]C[Now let's take a look at this kosumi. What happens if black wants to secure the corner? What should black do?]
(;B[fc]TR[gb]SQ[gc]C[If you play here, white's stone is better placed at G18 than G17, because next white can jump into the corner.]
)(;B[fb]C[What if black blocks this way?]
(;W[fc]
;B[ec]
;W[gc]TR[eb]SQ[gb]SQ[fc]SQ[hc]TR[gd]SQ[id]C[I think the problem is that after white wedges and connects, there are two cuts for black. Black's weakness is exposed. These two cuts are not quite severe. However, the problem is that white's group is safer because of them. It's almost alive locally.]
;B[eb]C[Let's say black connects here.]
;W[gd]
;B[ge]
;W[fe]SQ[eb]TR[hd]TR[ge]TR[he]C[White can push and cut off the three stones. Maybe not immediately, I'm just showing the idea. (Black wouldn't play E18 immediately, either.) It's not so severe for black, but it's unpleasant.]
)(;W[sa]
;B[ic]C[If white tenukis, black can cut. Maybe not immediately, but white's group does have a weakness.]
;W[jc]
;B[ib]
;W[jd]
;B[hb]TR[gb]TR[hc]C[White has to give up these two stones.]
))(;B[eb]TR[gb]MA[gc]SQ[hc]SQ[id]C[What else can black play, maybe like this? I think this can secure the corner but it's just so passive. It doesn't give the three stones any pressure. It doesn't reduce any of white's liberties. I guess that is why the kosumi at G18 is better than the extend for white, but it's also the reason why the AI doesn't want to protect the corner after the kosumi.]
;W[cc]C[So white 3-3s.]
(;B[be]C[Let's say black descends (the simple move).]
;W[ec]C[White attaches.]
(;B[fc]
;W[dc]
;B[fb]
;W[ed]TR[fc]SQ[dd]SQ[be]SQ[ce]C[If black blocks from the other side, white can cut off the three stones. That's a disaster for black.]
)(;B[dc]C[So black has to cut.]
;W[fc]
;B[ed]TR[eb]C[E18 was passive because the territory has been greatly reduced.]
))(;B[bf]C[Black might hane.]
))(;B[kd]C[So the AI pincers from the other side, which is understandable with the analysis we have seen so far.]
(;W[dm]C[White tenukis. This is hard to understand for me, but it's pretty common AI style. Let's see what happens.]
;B[dn]
;W[ie]C[White is going into the center.]
;B[if]C[This is tighter than my jump in the next variation, but it makes total sense.]
;W[jf]
;B[je]TR[jf]C[Is this a trap?]
(;W[hf]
;B[ig]
;W[gd]
;B[ge]
;W[fe]
;B[gf]SQ[hf]TR[jf]C[K14 is not a trap.]
)(;W[jc]C[Makes total sense.]
;B[kc]
;W[hf]
;B[ig]
;W[eb]C[Makes sense. Steals blacks territory and makes eye-space.]
;B[hg]
;W[gf]
(;B[gg]C[So black has to give up the two stones.]
(;W[ee]C[(End of AI variation.) KataGo gives white -0.3 pp for 28. G18]
(;B[fe]
;W[ff]
;B[eg]
;W[ef]
;B[dg]
;W[ed]SQ[dd]SQ[fd]TR[hd]SQ[ce]SQ[fe]TR[he]C[If black tries to save the two stones like this, the corner is dead.]
)(;B[ff]
(;W[ge]
(;B[gd]
;W[fe]TR[dd]TR[fd]TR[gd]TR[hd]TR[ce]TR[he]C[The corner is still dead.]
)(;B[fe]
;W[gd]
;B[ed]SQ[gd]TR[ee]C[The marked exchange is good for black. This would be even worse for white than the direct cut at G16 in the next variation.]
))(;W[ed]TR[dd]TR[ce]TR[ee]C[I think I've got it. White can just cut off the two stones and capture the whole corner. That explains why KataGo played E15.]
)))(;W[gd]C[Capturing is a little passive for white.]
;B[ff]
;W[ge]
(;B[fe]MA[eb]MA[gb]MA[hc]MA[jc]MA[gd]TR[hd]MA[id]MA[ge]TR[he]MA[ie]SQ[cf]SQ[df]MA[gf]MA[hf]SQ[dh]SQ[eh]SQ[fh]SQ[gh]SQ[fi]C[If white captures, I think this is pretty okay for black already because white's left side group will be black's next target. White's top side group lives pretty happily, but is already blocked in, has no potential and the territory isn't big.]
)(;B[cc]C[I'm not sure if the AI could come up with some better move, something like this maybe?]
)))(;B[fe]TR[hd]TR[he]C[Black cannot save the two stones.]
;W[gg]C[The corner isn't alive and the outside is kind of broken.]
;B[cc]
;W[kf]TR[cc]C[If you make life in the corner, this is gonna be a hard fight for black.]
)))(;W[ie]C[If white extended directly, what would happen?]
;B[hg]TR[gb]TR[hc]TR[id]TR[ie]TR[cf]TR[df]TR[dh]TR[eh]TR[fh]TR[gh]TR[fi]C[Let's play some simple moves, let's just jump. This move puts pressure on two baseless groups at the same time.]
;W[dm]
;B[dn]SQ[cf]SQ[df]SQ[dh]SQ[eh]SQ[fh]SQ[gh]SQ[fi]TR[dm]C[So what does this exchange achieve? It's sort of like support for the side group, I think, but it's hard to predict for a human player.]
;W[fk]TR[dm]C[Later, when white runs into this direction, this move can connect with D7, but I'm not sure.]
))))(;W[gg]C[This is another choice. I'm actually not sure if this is bad.]
(;B[fj]
;W[ff]
)(;B[ff]
;W[fh]
;B[he]C[Maybe black just extends and comes out.]
)(;B[qp]
;W[qq]
;B[rq]
;W[qo]
;B[rp]
;W[pn]
;B[ro]
;W[po]
;B[qm]
;W[eb]
;B[ec]
;W[fb]
;B[db]
;W[cb]
;B[bf]
;W[da]
;B[cg]
;W[pm]
;B[gq]
;W[gr]
;B[hq]
;W[hr]
;B[fp]C[KataGo gives white -0.8 pp for 24. G13]
)))(;B[fh]C[I feel like the natural move is to cut, but I don't know what's gonna happen.]
;W[ff]
;B[fg]
;W[eg]
;B[gf]
;W[fe]
;B[ee]
;W[ef]
;B[gd]
;W[hh]
;B[hd]
;W[fj]
;B[ck]
;W[gg]
;B[hg]
;W[gh]
;B[kc]
;W[ql]
;B[qp]
;W[qq]
;B[rq]
;W[rr]
;B[ro]
;W[sq]
;B[po]
;W[rp]
;B[op]C[KataGo gives black -1.2 pp for 21. F12]
)(;B[cj]TR[ck]C[As a human, my intuition is the tiger's mouth, but it looks like in a lot of cases, AIs like the keima better.]
(;W[bh]C[I think the reason is that in the future, white can still play this second-line clamp, so the tiger's mouth isn't much better than the keima in terms of territory.]
)(;W[gh]
;B[hd]
;W[id]
;B[he]
;W[ic]
;B[qp]
;W[qq]
;B[rq]
;W[qo]
;B[rp]
;W[pn]
;B[ro]
;W[po]
;B[qm]
;W[fb]
;B[ec]
;W[eb]C[KataGo gives black -2.7 pp for 21. C10]
)))(;W[ci]C[Game 73 continues here.]
))(;W[ci]TR[cn]C[My question is, how does black handle this?]
;B[cj]
;W[bi]
;B[dj]
;W[bh]SQ[ch]TR[cn]C[I think when black tenuki'd with C6, black saw that the C12 stone was not important, but it's counterintuitive. Once white captures C12, the white group is pretty safe and black didn't get any territory because black is undercut here. White can jump into the three-space extension at any time.]
;B[bf]
;W[cl]
;B[bg]
;W[cg]
;B[bj]
;W[cm]
;B[dn]
;W[ek]
;B[bo]
;W[bp]
;B[bm]
;W[bl]
;B[fi]
;W[ei]
;B[ej]
;W[fj]
;B[fk]
;W[gj]
;B[dk]
;W[el]
;B[dl]
;W[dm]
;B[em]
;W[fl]
;B[ak]
;W[gl]
;B[fn]
;W[am]
;B[bn]C[KataGo gives white -1.1 pp for 18. C11]
)(;W[co]C[In game 1, white continued here instead.]
)(;W[dj]C[In game 9, white clamped here instead.]
)(;W[qo]C[In eight games, white continued here instead.]
))(;W[cj]C[In game 37, white continued here instead.]
))(;W[fc]C[In game 4, white continued here instead.]
)(;W[ql]C[In game 40, white continued here instead.]
))(;W[cc]TR[ch]C[If I were white, I'd jump into the 3-3 directly here, but it seems like this version of KataGo doesn't like the 3-3 after getting pincered by the one-space lower pincer (all comments on this game by terrific, OGS 5d).]
;B[cd]
;W[dc]
;B[ed]
(;W[bd]
;B[be]
;W[bc]
;B[bf]
;W[fc]C[This joseki is pretty simple and there are not many choices for both sides. After this, white grabs the territory and black takes the influence. Black also gets sente. It's not like white is ahead, but as human player, I feel that this joseki is easy to control for white.]
)(;W[fb]
;B[qp]
;W[qq]
;B[rq]
;W[qo]
;B[rp]
;W[pn]
;B[ro]
;W[po]
;B[qm]
;W[ol]
;B[cn]
;W[fq]
;B[dk]
;W[gc]
;B[gd]
;W[hd]C[KataGo gives white -0.6 pp for 10. C17]
)))