(;GM[1]FF[4]SZ[19]AP[SmartGo:3.1.7]CA[shift_jis]
GN[40annotated]
PW[AlphaGo]
PB[AlphaGo]
EV[AlphaGo selfplay]RO[40]
KM[7.5]
RE[W+R]
RU[Chinese]MU[0];B[pd];W[dd];B[qp];W[dp];B[fq];W[cn]LB[oq:A]
C[Of course the favorite move for White 6 was A. Playing away from Black's approach and prioritizing the approach to Black's 3-4 point became common after AG, continued with Zen, and now is still given the best score by top engines. ]
;B[kq]
C[The mini-Chinese. As in many cases, Leela likes the 3-3 points in this opening. A is suggested for White here, while B was the most common move before AG.]
LB[qc:A][qj:B];W[op];B[pm];W[lp]LB[qc:A]
C[Leela seemed to have trouble finding White 10, using most of it's playouts on A. When 10 did come up, it's score immewdiately was close to that of A, and 10 was clearly the favorite local move. ]
;B[lq];W[mp]
(;B[kp];W[qq];B[rq];W[pq];B[ro];W[mq]LB[hq:A]
C[White is settled, and this is a success for White. Black's position on the right looks good, but the weak lower side with a White invasion coming at A looks troublesome. ]
;B[qf];W[hq];B[kn];W[ho];B[dr]LB[mm:A]
C[Here it would have been more natural to play at A to reinforce the Black group on the side and start building a moyo in the upper right. ]
;W[fr]LB[cq:A]
C[While White could have played at A to start a running fight, White 24 will allow Black to live in the corner or the side, and White is focusing on connecting above to create a strong position. The overall position seems to favor White in either case, so it could be that White is choosing the less complicated game. ]
;B[er];W[fp];B[gq];W[gp];B[gr];W[nc];B[fc];W[cf];B[oc];W[nd];B[jd]
C[Black is looking much like a human player in this opening. The kick at A combined with the pincer at B has always been a common pattern, and I think it would come easily for any experienced player. ]
LB[oc:A][jd:B];W[ng];B[ip]LB[lc:A][qc:B]
C[Black 37 is a move that Black wants to get in at some point, and if Black cuts next Black will get a nice territory on the side. That said, I would not think of playing the peep at this time, because White will not answer locally. I would want to pincer at A. which would immediately reduce the threat of a White invasion at B. Black would continue to attack the White group, with the aim to complete the UR corner territory and the upper side. ]
(;W[ic]LB[of:B]
C[An unusual but effective invasion. The more common invasion is shown as a variation. ]
(;B[id]
C[While one might be tempted to cover on the third line, the game move is more reasonable (see var). ]
;W[jc];B[kc];W[kb];B[lb];W[lc];B[kd];W[mb]
C[When I compare this position to the variation for White 38, I see that White has the potential to cut Black with a play at A. and when Black adds a stone locally White will not always save the two marked stones, so White has some extra flexibility. ]
LB[hd:A]TR[ic:jc];B[hp];W[ec];B[hc];W[ob]LB[dk:A]
C[With 50 I would play at A. White's group on the upper side is already alive. ]
;B[cl];W[qc];B[qd];W[cj];B[el];W[ej];B[fn]LB[gn:A][ep:B]
C[While White A looks like good shape, White will have to go back after Black replies and add a stone at B to connect. With Black 57 hitting a vital point in White's shape moving out like this is not attractive, so White will live in the corner. ]
;W[cq];B[bn];W[bo];B[dn];W[cm];B[bm];W[co];B[di];W[dj];B[dm];W[bk];B[bl]
;W[cr];B[bi]LB[bj:A][dg:B]
C[Black attacks again. If White A, Black B makes good shape. ]
(;W[eg]
C[The variation shows how White could have simply pushed through. ];B[ce]
C[Black 73 is a tesuji that attempts to play some forcing moves to improve Black's shape on the left side, or otherwise to set up an invasion in the corner, depending on how White responds. ]
(;W[bf]TR[bi][di]
C[When White plays at 74, the value of the two marked stones decreases, and in return Black has some potential in the corner. ]
;B[pi]LB[bj:A][fh:B]
C[Black plays away. White can make about 15 points on the side by playing at A to capture two stones, and later Black will be able to play forcing moves in the center starting with Black B. When the left side and the UL corner both have weaknesses, the value of this area has decreased slightly, so it was an opportunity for Black to play away. ]
;W[lr];B[kr];W[rc];B[de];W[ee]
(;B[eb]
C[The direct approach fails (see var). ];W[db];B[cc]
(;W[cd];B[dc];W[ed];B[cb];W[qk]
(;B[rr]
C[If Black attaches on the fourth line to surround White, White can live on the side (see var). ]
;W[ol];B[om];W[qh];B[qi];W[ri];B[ph];W[rh];B[og];W[pl];B[rm];W[nl];B[nm]
;W[nh]
C[While Black is threateningto kill White on the lower side, the fight on the right is more important. ]
;B[ni];W[mm];B[ml];W[mk];B[ll];W[mi];B[nj];W[mj];B[nf];W[mf]
(;B[of]
C[Black did not have time to cut White (see var). ];W[oj];B[oi];W[nk];B[me]
;W[lf];B[rj];W[rk];B[qj];W[sj];B[ne];W[or]
C[White's group on the lower side lives. White has more territory, and the focus will now be on White's weak group in the center. ]
;B[lh];W[mh];B[ld];W[la];B[gh];W[ki]LB[fi:A][rf:B]
C[I completely agree with White's choice to add a stone to the center. White can make an eye at B, so this should not be too difficult for White. ]
;B[kg];W[ij];B[eh];W[ci];B[ih];W[kl];B[lm];W[il];B[hk];W[hj];B[fi]LB[ch:A]
C[Threatening Black A.];W[fg]LB[ch:A][ei:B]
C[If Black A, White can cut Black off with B. ];B[lk];W[kj];B[gk];W[hm];B[go]
;W[fh];B[do];W[ar]
(;B[gi]LB[gj:A]
C[Both 151 and the connection at A have their problems for Black (see var). ]
;W[fk];B[gj];W[gn]
(;B[ep]
C[Black is in danger of getting cut off (see var). ];W[fo];B[ei];W[ch];B[eo]
;W[fl];B[kf];W[jh];B[hf];W[go];B[fm]LB[hl:A]
C[While Black can cut White off with a move at A, White actually has a number of potential eyes, as we shall see in the game. ]
;W[rf]
C[White 166 makes one eye, with some extra potential. ];B[rd];W[io];B[jo]
;W[qg]LB[pg:A][re:B][pe:C]
C[With forcing moves at A and B, White can aim to sever Black's connection with a play at C. ]
;B[in];W[kh]LB[ii:A][in:B]
C[White also has potential eyes with plays at A or B. ];B[dq];W[cp];B[hb]
C[Finally we are entering the endgame. With the computer analysis, White had a winning score throughout the game, so one might assume it's an easy win for White now? Well, it's actually extremely close and I would not feel safe at all. ]
;W[qr];B[bj];W[ck];B[ak];W[bh];B[bd];W[be];B[jb];W[bc];B[bb];W[ad];B[lg]
;W[ii];B[jk];W[ik];B[kk];W[jj];B[fd];W[re]
C[This is where Leela suddenly jumped about 20 percent to give Black a winning score, and stubbornly refused to change its mind. Leela wanted to play away, but when I had White play A, Black B, White C to cut off the Black stones, Leela agreed that White could win. ]
LB[pg:A][oh:B][pe:C];B[sd];W[iq];B[jp];W[pg];B[oh]
C[After Black plays at 195, White cannot capture the Black stones by cutting them off (see var). ]
(;W[mr];B[fe]
C[There are a numbeer of 5-6 point moves, making this fairly complicated for a 50-60 move endgame. I tried various sequences, with White winning by 0.5 every time, so I will conclude that Black has no chance. ]
;W[ff];B[sc];W[qb];B[qe];W[se]
(;B[no];W[ge];B[gd];W[gf];B[gm];W[hn];B[mg];W[ks];B[js];W[ls];B[jr];W[he]
;B[sb];W[oo];B[pc];W[pb];B[im];W[hl];B[jl];W[ai];B[md];W[mc];B[ja];W[ka]
;B[ab];W[rs];B[if];W[qn];B[qm];W[pf];B[pe];W[fb];B[ea];W[qo]
(;B[rn];W[pp];B[rp];W[mo];B[mn];W[pj];B[jg];W[ie];B[sl];W[rl];B[li];W[lj]
;B[je];W[hh];B[hg];W[hi];B[lo];W[hd];B[gc];W[sk];B[sm];W[cs];B[dh];W[dg]
(;B[ds];W[gg]
C[W+0.25 stones (W+1.5pts)])
(;B[ig];W[ac];B[ao];W[ap];B[al];W[aj];B[an];W[es];B[fs];W[ds];B[rb];W[ra]
;B[np];W[nq];B[nn]
C[W+0.25 stones (0.5pts)]))
(;B[pk];W[ql];B[rn];W[pp];B[rp];W[mo];B[mn];W[ie];B[je];W[ig]
C[W+0.5]))
(;B[gf];W[ks];B[js];W[ls];B[jr];W[mn];B[po];W[mg]))
(;W[pe];B[od];W[oe];B[pb];W[pc];B[oa];W[nb];B[rb];W[qb];B[qa];W[pa];B[bs]
;W[cs];B[pb];W[fb];B[sc];W[ea];B[md]
C[Black had plenty of ko threats for the direct ko, and White ends up losing the upper side group. ]
))
(;B[fo];W[fl];B[gm];W[gl];B[hl];W[fm];B[im];W[kh];B[lg];W[jg];B[kf];W[hf]
;B[if];W[hg]
C[When Black tries to cut White off, various Black group get into trouble. ]
))
(;B[gj];W[hi];B[gi];W[jg];B[kf];W[hh]
C[White will make an eye in the center or connect to the left. ]))
(;B[nk];W[oi];B[oj];W[oh];B[pk];W[rl];B[pg];W[qj];B[pj];W[of];B[mh];W[mg]
;B[lh];W[lk]
C[Black is going to lose the group on the right. ]))
(;B[pk];W[ql];B[pl];W[qh];B[qi];W[ri];B[ph];W[rh];B[pg];W[rm]
C[White is alive. ]))
(;W[dc];B[df];W[dg];B[cd];W[cb];B[ef];W[ff];B[fe];W[ed];B[cg];W[ch];B[fg]
;W[gf];B[ci];W[bg];B[fh]LB[hg:A][bj:B]
C[With some help from my computer, I found thid variation, which I think is sound. Black has a threatened squeeze with a play at A, and a connection underneath with a play at B. On the whole, this is a dangerous fight for White. ]
))
(;B[df];W[dg];B[be];W[cd];B[bd];W[bc]
C[Black is just dead. ]))
(;W[de];B[bf];W[be];B[bg];W[cd];B[bj]LB[ah:A]
C[Black has taken the maximum possible endgame profit, with an eye at A. ]
))
(;W[ci];B[ch];W[dh];B[dg];W[bh];B[eh];W[bg]
C[Not bad for White, and simpler than the game. ]))
(;B[jc];W[gd]
C[Black has no way to connect underneath. ]))
(;W[hc];B[hd];W[ic];B[id];W[jc];B[kc];W[kb];B[lb];W[lc];B[kd];W[mb]
C[This pattern can be found in many games. When compared tothe game, the subtle difference is that White A has been exchanged for B, while those two stones are missing in the game. ]
LB[hc:A][hd:B]))
(;B[nr];W[jo];B[ip];W[ml]LB[ml:A][qc:B]
C[If Black takes away White's base, this is the local continuation. With the final move at A, Leela was suggesting B, but I would say A is much easier to play, and White has an advantage in either case. ]
))

