(;GM[1]FF[4]SZ[19]AP[SmartGo:3.1.5]CA[shift_jis]
PW[AlphaGo]
PB[AlphaGo]
EV[AlphaGo selfplay]RO[33]
KM[7.5]
RE[W+R]
RU[Chinese]MU[1];B[pd];W[dp];B[pq];W[dc];B[de];W[ce];B[cf];W[cd];B[df];W[fc]
;B[cn]
C[Playing this kakari was an unusual move before AG, with Black's normal move being an extension at A or in the vicinity. ]
LB[dj:A];W[dk]
C[In game 30 of this set, AG simply answered the kakari at A, while in this game it pincers. Both have been played in human pro games. ]
LB[fq:A];B[fq];W[en]LB[en:A]
C[In response to a Black kakari, White's high keima at A from the star point has been played for centuries, while in this context of White playing a hasami first and then playing at A in response to Black's double kakari, it became popular in 2004. ]
;B[cq];W[cp];B[dq];W[ep]
(;B[cj]
C[Black cannot play a hane on the second line (see var). ]
(;W[ck]
C[If White pushes through in the corner, Black will take the cutting stone (see var)]
;B[dj];W[ek];B[ej]LB[gr:A][qn:B]
C[I would have played away with Black 23. Big moves were A or B. ];W[qo]
;B[pl];W[qc]
C[This is a position in which I was expecting AG to press at A, a move that had success in the Master vs humans set of games played on the net. ]
LB[op:A];B[qd];W[pc];B[nc];W[oc];B[od];W[nb];B[qp]LB[rc:A][mc:B]
C[Black plays away from the UR corner. The Black play at A does not function well for Black in this board position, and the orthodox-looking Black play at B was a less common choice for AG. ]
(;W[nd]
C[When Black has played away mid-joseki in the upper right corner, it is always a possibility that White will cut at 34. This will start a fight in the center. Otherwise, White could have played in the lower right corner (see var). ]
;B[mc];W[mb];B[lc];W[ne];B[le]
(;W[lf]
C[White would like to attack on the right immediately, but that will not succeed without a stronger base in the center (see var). ]
(;B[rc]
C[Black now switches to the right. If Black had played in the center, that would have given White a chance to attack on the right (see var). ]
;W[rb];B[re]
(;W[sc]
C[The hane in the corner is big, so White answered (see var). ]
(;B[mf]
C[Black 45 is the more aggressive move, while Black could also have extended on the side (see var). ]
(;W[nf]
C[White could not cut with this move (see var)];B[me];W[mg]
(;B[sd]
C[Black cutting in the center was not going to work (see var), so Black starts a ko. Once started, this ko usually trumps almost everything else, as Black capturing at A is a huge move that threatens White in the corner, while if White wins the ko to capture at B,  Black's potential for territory on the right side will be mostly gone. Black needs just one valid ko threat to force White to connect at A, which would be a valuable kikashi for Black. ]
LB[se:B][sb:A];W[rd];B[ng];W[se];B[of]LB[nd:A][sd:B]
C[To sum up this fight, White's cutting stone at A was captured, which is a plus for Black. It should be noted that winning the ko at B was a huge profit for White, so that was White's compensation. The overall position is about even, or maybe a slight advantage for White. In general, it is a good idea for Black to have a forceful ko threat when starting the ko at B. ]
;W[po]LB[op:A][eq:B]
C[I always thought that the AG move was to press at A, so I was a bit suprised by this move. I think the idea with White 54 is to take sente and get to the big point at B. ]
;B[np];W[eq];B[er];W[dr];B[cr];W[fr];B[ds];W[gq];B[nh]
C[Black breaks the ladder. ];W[hn]TR[fq]
C[White captures the marked stone. White could have played a more active move at A, looking to attack at B next.]
LB[om:A][oq:B];B[on]
C[Black seemed to gain in the sequence from White A to this move, and now the game looks promising for Black. ]
LB[po:A];W[pm]
C[While White A would have been a perfectly normal move, White 66 works to give White some extra local space to make eyes.]
LB[rl:A];B[om];W[ql]
(;B[qm]
C[The var shows Black playing a double hane. The game move is better. ];W[pp]
;B[qq];W[pn]
(;B[pk];W[rl];B[fk]LB[fk:A]
C[Black A was a good shape move that was waiting to be played for about fifty moves. Black A puts the three White stones in damezumari, setting up potential attacks on the left. Timing is important, and played at this point of the game, it has the added value of giving Black a big center. ]
;W[lq]
C[White looks at the hane at A. ]LB[oq:A];B[fl]LB[dm:A]
C[Black is building on the center while threatening A. ];W[oq];B[or];W[nq]
;B[nr];W[mq]
C[It is hard to say how valuable the sequence from A was, when White gained little territory. It was a thick move, and White is looking to peep at B next. ]
LB[oq:A][nl:B];B[ln]
C[Black can play at A next for a big center moyo. ]LB[im:A];W[bh]
C[White 84 is an endgame tesuji. In this case, it provides an escape route fot the marked White stones with a ko. In the actual game, White did not actually play the ko until it was too late to save the group, and was just an endgame play. ]
TR[ck:ek];B[ch];W[bj];B[bi];W[ai];B[ci];W[hl]
C[White erases the center, which is more important than the left side. ]
;B[dd];W[cc];B[fn];W[fo];B[em];W[bo]LB[bq:A][bf:B][bg:C][ag:D]
C[With White 96 it becomes apparent that the left side was not as big as it might have seemed. White can expect to get several points back by squeezing the corner with A. White B, Black C, White D will start a ko to reduce Black's side. ]
;B[im];W[hm];B[op];W[ro];B[kp];W[jr];B[ip];W[iq];B[ik];W[il];B[jl];W[gj]
;B[jk];W[hk];B[dn]LB[dn:A][go:B]TR[ck:ek]
C[Black A sets up B to cut White off in the center, and makes it relatively difficult for White to save the marked stones. ]
;W[ij];B[hi];W[hj];B[go]LB[go:A][bn:B]
C[Black A was a strong attack against White in the center, but in the game it did not seem to succeed. A more peaceful move would have been Black B, capturing the left side.  ]
;W[jm]
(;B[gn]TR[im]
C[Black cannot escape with the marked stone (see var). ];W[km];B[lk];W[hg]
LB[jo:A][ll:B][bn:C]TR[im]
C[There were a number of  likely moves for White, making this a complicated position. White A to finish capturing the marked stone, and White B to give Black bad shape in the center were moves that I could have been played. White C, which was played soon in the game, made the difference between a dead White group on the left and a potential ko to save them. ]
;B[ih];W[hh];B[lm];W[bn]LB[bn:A][bl:B][bf:C][fj:D]
C[White A partially saves the White group. Black can still attack at B, after which White can connect on the second line and then play at C to get a ko. In some cases the White cut at D will materialize into a real threat. ]
;B[gi]
C[Seeing how this move turned out, I think it would have been better for Black to go after the left side with Black A. My question is: did AG miscalculate the geta?]
LB[bl:A];W[ii]
C[White threatens a ladder with A. ]LB[jh:A];B[ig];W[if];B[kh];W[ki];B[jh]
;W[io];B[hp];W[jp];B[jo];W[jq];B[jn];W[fi];B[gh];W[fj];B[bl]LB[fg:A]
C[Black could have played at A, probably leading to a semeai between the two marked groups which appears to favor Black. ]
TR[hl:hm][il][em][fn:gn];W[ff]LB[ff:A][fg:B]
C[So, did AG as Black miss the White move at A? Ladders, even short ones, are known to be a weakness in the neural network system, and sometimes the one move difference of looking at it from White or Black's perspective seems to change the outcome. For instance, Leela gave Black B a score of about 50.5, a slight advantage for Black, but after the stone was placed, it immediately found White's refutation and gave White a score of almost 60. ]
(;B[gr]
C[Black switches to attack the lower side. In this sharp fight in the center, White never had time to play the (locally) forcing moves from A. The variation shows how White's geta in the center works, and how it is actually a ladder. ]
LB[bq:A];W[fp];B[fs];W[hr];B[bk]LB[bk:A][fg:B]
C[Now that Black has played A, Black can escape with B next. ];W[hf];B[fq]
;W[gp];B[ho];W[fr];B[rj];W[rm];B[fq];W[hq];B[rf];W[in];B[li];W[bf];B[bg]
;W[oo];B[mr];W[ol]
(;B[ok]
C[The var shows why Black didn't play atari from the other side. ];W[rg]
;B[sf];W[pf];B[oe];W[qe]
C[In the actual game this starts a ko on the first line, so we don't get to see White's tesuji in actual play. If one ignores the ko, White can squeeze to connect to the side group.]
(;B[sd]
C[As mentioned in the previous comment, Black will fight the ko at A, and White's tesuji to reduce the left side is not shown in the game, so it is shown in the variation. ]
LB[sd:A];W[bm];B[cm];W[se];B[qf];W[qj];B[qk];W[rk];B[qi];W[ri]
(;B[pj];W[sj];B[rh];W[qj];B[qh]TR[ri][qj][sj]
C[White did not have enough ko threats to get the best result, but did manage to reduce Black's territory with the marked capture. ]
(;W[fr];B[aq];W[kj];B[lr];W[nl];B[nk];W[ap]
C[Cleverly preventing Black from playing A with sente to get better eyespace. ]
LB[bp:A];B[bq];W[gs];B[ml]
(;W[ag]LB[ap:A][bq:B]
C[With the exchange of White A for Black B, White has reduced Black's eyeshape in the corner, and can harrass it with a ko (see var), ]
;B[ah];W[gm];B[fm];W[bh];B[cg]
(;W[no];B[id];W[lj];B[nm];W[je];B[gc];W[fd];B[fb];W[eb];B[jd];W[sr];B[rr]
;W[es]
C[With several kos of various sizes, this half point endgame was too challenging for me to say who should have won, and I will just say that I could find no outright mistakes, a good deal depended on the number of ko threats throughout the endgame, and that there were different ways to play the moves in the center that seemed to be about equal to the game sequence. ]
;B[bs];W[lb];B[gd];W[ge];B[kb];W[gb];B[hb];W[fa];B[be];W[dr];B[ar];W[bd]
;B[af];W[ib];B[hc];W[rp];B[sd];W[ha];B[rc];W[rs];B[qs];W[rq];B[ss];W[rd]
;B[kf];W[rs];B[qr]
(;W[se];B[eg];W[fg];B[sd];W[cl];B[al];W[se];B[eh];W[fh];B[sd];W[am];B[aj]
;W[se];B[ad];W[ac];B[sd];W[kn];B[kr];W[se];B[ic];W[qg];B[pe];W[sh];B[pg]
(;W[lo];B[kq];W[ko];B[mj];W[lh];B[mi];W[ke];B[kg];W[kd];B[kc];W[jf];B[rj]
;W[do];B[si];W[co];B[eo]
(;W[ji];B[lg];W[en];B[dm];W[ri];B[ob];W[pb];B[si];W[ld];B[md];W[ri];B[mn]
;W[qj];B[mp];W[lp];B[mo];W[rj];B[la];W[kl];B[kk];W[cs];B[ma];W[oa];B[ds]
;W[gl];B[el];W[cs];B[sd];W[rc];B[ds];W[si];B[sg];W[cs];B[ka];W[ia];B[ds]
;W[jg];B[mh];W[cs];B[na];W[ob];B[ds];W[gk];B[dl];W[cs];B[sq];W[sp];B[ds]
;W[ae];B[bf];W[cs];B[ll];W[ds];B[bp];W[ao];B[ei];W[ks];B[ls];W[js];B[ed]
;W[ad];B[eo];W[sq];B[se];W[ss]
C[W+0.25 (W+0.5)])
(;W[ri]))
(;W[mi]))
(;W[mi]))
(;W[jc]))
(;W[es];B[bs];W[dr];B[ar]
C[White's endgame sequence in the corner. ]))
(;W[bq]))
(;B[sj];W[qg];B[pe];W[pg];B[og];W[pj];B[rh];W[pi];B[si];W[sg];B[sd];W[ph]
))
(;B[qf];W[qg];B[pe];W[pg];B[og];W[qj];B[qk];W[rk];B[qi];W[ri];B[pj];W[sj]
;B[rh];W[sg];B[qe];W[si]TR[pg:sg]
C[Getting the marked line of stones, White can connect to the side group. ]
))
(;B[nl];W[rg];B[sf];W[qj];B[qk];W[rk];B[ri];W[ok];B[pj];W[nk];B[nn];W[qi]
;B[rh];W[qh];B[pi];W[qg];B[sg];W[pf];B[oe];W[qe]
C[This is going to be a ko at A, but is dangerous for Black.]LB[sd:A]))
(;B[fg];W[gg];B[fh];W[eg];B[eh];W[dh];B[ei];W[cg]
C[A short ladder captures the Black stones. ]))
(;B[in];W[io];B[jn];W[ho];B[jq];W[hr]
C[With the forcing move at A, White is safely connected. ]LB[jo:A]))
(;B[qk];W[rl];B[rk];W[no];B[ol];W[rm];B[ro];W[rn];B[rp];W[oo];B[mo];W[oq]
;B[nq];W[nn];B[lp]LB[qk:A]
C[An atari at A and covering looks vulgar when compared to the game move, but I like this var anyway. Black attacks while taking territory. ]
))
(;B[qk];W[pk];B[ol];W[rk];B[qj];W[rj];B[qi];W[ri];B[qm];W[rl]
C[White will easily live on the side. ]))
(;B[ng];W[pf];B[og];W[rd];B[qe];W[of];B[qh];W[qg];B[rg];W[ph]
C[Black cannot capture the White group. ]))
(;W[me];B[nf];W[oe];B[pf];W[ld];B[ke];W[kd];B[kc];W[md];B[jd];W[je];B[kf]
;W[jc];B[id];W[kb];B[lg]LB[me:A][kc:B]
C[When White cuts at A, Black gets to squeeze with this sequence. Black B was a key move that added value to the squeeze. Note that there are ladders involved that favor Black. Black sacs four stones to have a big lead in this var. ]
))
(;B[qh];W[mf];B[je];W[jf];B[if];W[jg];B[he];W[op]
C[Black could have played peacefully at A, allowing White to connect in the center, after which White will start a new fight at B. When compared with the game sequence, it is hard to say which was better. ]
LB[qh:A][op:B]))
(;W[mf];B[sb];W[ra];B[lb];W[pb];B[ph];W[je];B[ic]LB[sb:A][lb:B]
C[The hane at A leads to another forcing move at B, and Black reinforces on both sides while squeezing the White corner group. ]
))
(;B[kf];W[mf];B[kg];W[pf];B[rc];W[rb];B[re];W[qf]
C[In this var Black does not have the cut at A, and White has an advantage. ]
LB[oe:A]))
(;W[pf];B[rc];W[rb];B[re];W[qf];B[sb];W[ra];B[rf];W[qh];B[oe];W[of];B[nf]
;W[mf];B[ng];W[me];B[rh];W[qi];B[qg];W[pg];B[rg];W[lf];B[lb];W[ke];B[ma]
;W[oa];B[ic];W[pb];B[oh]
C[When White attacks at A, Black will be able to counter with B and the following cut. Black has a decisive advantage in this fight. ]
LB[pf:A][oe:B]))
(;W[op];B[pp];W[po];B[oo];W[rp];B[rq];W[oq];B[ro];W[no];B[on];W[nn];B[om]
;W[pr];B[sp];W[kq]LB[op:A][pp:B]
C[If White presses at A, Black will play at B to cut White, after Which White will have to sacrifice one side or the other. This var shows White trading to take a position on the lower side. This is an even result. ]
))
(;W[eq];B[er];W[fr];B[gr];W[dr];B[fs];W[cr];B[bq];W[br];B[ck]
C[Black can be satisfied with this local result. ]))
(;B[bp];W[eq];B[er];W[dr];B[cr];W[fr];B[ds];W[bo];B[gq];W[hq];B[gr];W[ci]
LB[bp:A][eq:B]
C[If Black plays the hane at A, this is a chance for White to push through at B and force Black to use a lot of moves to defend the side. White has a small advantage. ]
))

