(;CA[shift_jis]FF[4]RU[Chinese]MU[0]AP[SmartGo:3.1.7]SZ[19]GM[1]GN[39annotated]
EV[AlphaGo selfplay]RO[39]PB[AlphaGo]PW[AlphaGo]KM[7.5]RE[W+R]MULTIGOGM[1]
;B[qd];W[dp];B[pq];W[dd];B[nc];W[qo];B[cc];W[op]C[Pressing at 8 seemsto get a good score in just about any board position. ]
;B[oq];W[np];B[mq];W[dc]TR[np][mq][oq]C[The marked exchange gives White an ladder that wasn't working without it. ]
;B[cd];W[cf];B[ce];W[de];B[bf];W[cb];B[bb];W[bg];B[db]
(;W[be];B[df];W[cg]LB[bc:A]C[Next White has the squeeze at A. ];B[ca];W[bd];B[bc]
;W[ef];B[mp]C[Black 29 breaks the ladder. ];W[gj]LB[dg:A][fi:B]C[There was a time when most people liked to capture at A. Go Seigen suggested B to settle the ladder. AG takes it one step further. . ]
;B[ej]C[Ladder break. ]
(;W[cj]LB[dg:A][eh:B]C[Now Black A is a net with White B. Is White had played from the center Black would be able to get a base on the side (see var). ]
;B[ck]
(;W[dn]LB[dg:A]C[Usually White cannot afford to let Black escape at A, which means Black has a lot of forcing moves. This makes it troublesome for White to attack locally (see var), so with 34 White tries to attack on a larger scale. ]
;B[dj];W[ci];B[eh];W[dg];B[em]C[Black has made good shape. ];W[mo];B[lo];W[mn];B[ln]
;W[mm];B[lm];W[ml];B[qj];W[gp]
(;B[er]LB[gi:A][gm:B][cm:C]C[Yes, I expected Black to run out in the center (see var). Looking closely at the position, I find that Black has A or B as two paths of escape in the center, and also can try to make eyes with C. It will be difficult for White to capture the Black group. ]
;W[cq];B[hq];W[hp];B[iq]
(;W[cl]C[Playing from the center does not work (see var), so White takes territory to chase Black out. ]
;B[hm];W[dl];B[qm];W[ll]
(;B[ik]TR[eh][dj]C[Connecting the marked stones is not as important as influencing the right half of the board. The variation shows an example of Black saving the stones and then losing control of the center. ]
;W[hi];B[ii];W[ih];B[ji];W[jl]TR[eh][dj]LB[lp:A]C[White is eyeing the cut at A, and weakening Black's connection in general. Atthis point it is looking difficult for Black to think of saving the marked stones.]
;B[hh];W[gh];B[hg];W[gg];B[hf];W[lp];B[lr];W[pi]C[The upper right area was looking like a moyo for Black, so White reduces with a shoulder hit. ]
;B[pj];W[ni];B[jn]LB[lp:A][hm:B][ej:C]C[Black 75 captures White's stone at A and now the Black stone at B will connect one way or the other. Black is one steop away from connecting the stones at C. The idea of attacking White on the right might seem remote, but the truth is, White's big wall doesn't have eyes yet. Black 75 adds to the attacking potential by surrounding the White group. ]
;W[oj];B[qi];W[ph];B[el]TR[gp]LB[fk:A][en:B]C[Black's connection is still flimsy, but if White attacks at A Black can push at B to fix the connection while threatening to cut off the marked White stones. ]
(;W[pc]C[Invading at 80 is bigger than attacking Black on the right side (see var). ]
(;B[qh]C[We will see Black take territory on the right side, and then get some potential on the upper side while White lives in the corner. This seems to be more effective than answering directly (see var). If we think of three areas as the upper side, the UR corner, and the right side, Black gets two areas in the game, while the variation gives Black only one area. ]
;W[qc];B[pe];W[pf];B[qf];W[pg];B[re];W[oe];B[od];W[pd];B[qe];W[nb];B[mb];W[ob];B[ne]
;W[of];B[ld];W[rc];B[gf];W[dk];B[ek];W[hk];B[fq];W[fp];B[il];W[fg];B[fc];W[kh];B[en]
;W[eo];B[jh];W[lb];B[ma];W[gc]LB[lc:A][kd:B]C[White must invade the upper side. White is aiming to use the forcing move at A and a hane at B to make some space. ]
;B[gd];W[hd]
(;B[hc]C[Black plays forcefully, giving White some profit on the left. The variation shows how White can make a living shape if Black is too greedy. ]
;W[gb];B[id];W[fd];B[he];W[gq];B[gr];W[eq];B[fr];W[fb];B[cr];W[br];B[qp];W[rp];B[rq]
;W[pp];B[qq];W[pl];B[ql];W[pk];B[pm]
(;W[dr]C[White 138 was a big point, but I don't like it because now Black has some serious attacking chances (see var).]
;B[on];W[oo]
(;B[lh]C[As is often the case with AG, the game is simultaneously very close and very dangerous. I think Black should try  a stronger attack with 141 (see var). ]
;W[lj];B[mg];W[ng]
(;B[nh]C[145 is a point where a relatively peaceful endgame could have started (see var), but Black is trying to attack to get some extra profit. ]
;W[oh];B[mi];W[mj];B[nf]LB[nk:A]C[White must be wary of the peep at A, as White's second eye is in question. ]
;W[mh];B[dm];W[cm];B[nh];W[li];B[og];W[mh];B[cn];W[do];B[mi];W[ng];B[mh];W[mf];B[og]
;W[qk];B[rk];W[ng]
(;B[bk]C[The ko continues, but as we shall see at move 182 when White finally takes the other option, it is not a valid ko! Therefore I suggest that instead of the ko threat at 167, Black should have played an ugly but effective move (see var).]
;W[bn];B[og];W[rl];B[sk];W[ng];B[co];W[bo];B[og];W[rj];B[ri];W[ng];B[bm];W[cp];B[og]
;W[mc]C[Black cannot capture the White cut at 182. Why did AG waste time playing the ko when this was the clearest path to victory? ]
(;B[me]C[Black has no choice but to back off (see var)];W[lc]
(;B[pn]C[Black gets some compensation with 185, which threatens to kill the entire White group. Black needs to play 185 first (see var). ]
;W[nk];B[po];W[jo]C[Just believe me when I say it's a hopeless half point loss for Black now. ]
;B[io];W[jp];B[ip];W[kn];B[km];W[jm];B[ko];W[in];B[kp];W[kn];B[ff];W[hn];B[gm];W[eg]
;B[kl];W[lf];B[ng];W[kg];B[qg];W[oi];B[kd];W[kk];B[kq];W[ki];B[kc];W[kb];B[jb];W[jg]
;B[ig];W[fe];B[jf];W[kf];B[ke];W[je];B[jk];W[gn];B[jn];W[md];B[le];W[kn];B[ol];W[ok]
;B[jn];W[im];B[hl];W[gk];B[eb];W[ec];B[if];W[jc];B[ja];W[fm];B[fl];W[nd];B[jd];W[fn]
;B[gl];W[hb];B[ib];W[oc];B[es];W[ds];B[cs];W[bs];B[dh];W[ch];B[kn];W[di];B[ei];W[ge]
;B[hd];W[sd];B[ka];W[la];B[nq];W[no];B[rd];W[nl]
(;B[sc];W[sb];B[ad];W[af];B[om];W[ae];B[ac];W[ea]
(;B[se];W[fa]C[W+0.25 (1.5)])
(;B[da];W[fa];B[ha];W[se];B[sf];W[sc];B[ho];W[go]C[W+0.5]))
(;B[se];W[sc];B[ad];W[af];B[om];W[ea];B[da];W[fa];B[ha];W[ho]C[W+0.25 (0.5)]))
(;B[nn];W[no];B[nk];W[nl];B[jk];W[kk];B[mk];W[rm];B[rn];W[qn];B[sm];W[om];B[pn]
;W[nm];B[sl];W[ok]C[This variation shows that White can use a squeeze to make a second eye. ]))
(;B[lc];W[lg];B[ng];W[me];B[nd];W[md]C[Game over!]))
(;B[lg];W[rj];B[ri];W[mc];B[qg]LB[mc:A][og:B][nk:C][lc:D]C[This variation looks very dangerous for White. The point is, just living in the center is not good enough for White, and White must attempt to gain something with the cut at A. Black can use ko threats on the left side to fight the ko at B. If White backs off at C and Black gets to win the ko, then Black can go back to the upper side with D.]))
(;B[hb];W[mf];B[lf];W[me];B[md]
(;W[le];B[ke];W[nf];B[kg];W[rn];B[rm];W[ip]C[Also very close.])
(;W[jo];B[jp])))
(;B[mj];W[ki];B[nk];W[nl];B[ok];W[ol];B[kj];W[jj];B[li];W[kk];B[lj];W[ij];B[jg]
;W[nj];B[mh];W[mk];B[jk];W[hj];B[in];W[me];B[mf];W[nf];B[nd];W[mg];B[lf];W[lg];B[kg]
;W[ng];B[lh];W[rn]C[This is a close game too, but it looks like White has been pushed around. ]))
(;W[qk];B[rk];W[rl];B[rj];W[om];B[pn];W[po];B[on];W[nn];B[rn];W[dr]TR[ni][oj][ll]
C[This is definitely the way I would want to play. The marked White group is safe now. ]))
(;B[gb];W[hc];B[fd];W[lc];B[mc];W[kd];B[ke];W[le];B[md];W[je];B[kf];W[jc];B[mg]
;W[hb]C[This is a failure for Black.]))
(;B[pd];W[oc];B[od];W[nb];B[mb];W[mc];B[nd];W[lb];B[ob];W[ma];B[pb];W[qh];B[ok]
;W[pl];B[ql];W[pk]C[After reducing Black's potential on the top, White gets to cash in with an attack on the right. This is good for White. ]))
(;W[qh];B[ok];W[pl];B[nj];W[oi];B[ql];W[pk];B[pn];W[ol];B[po]LB[qh:A][pl:B][qp:C]
C[Once White covers at A, the fight here heats up, which is probably why White did not. White's strong peep at B is necessary to justify A, otherwise White would be gaining little from the attack. White can extend at C to live in the corner, but will end in gote, so Black will get to protect the UR corner. ]))
(;B[el];W[dk];B[ek];W[il];B[im];W[jm];B[jn];W[km];B[jo];W[hl];B[gm];W[pi];B[pj]
;W[oi];B[rh];W[qg]C[Good for White.]))
(;W[gl];B[cm];W[cn];B[gi];W[hi];B[gh]LB[bl:A]C[Black still has potential eye space with a play at A, so this attack is not easy for White. ]))
(;B[hm];W[qh];B[qm];W[oi];B[on]LB[hm:A][qh:B]C[If Black A, White will probably just switch to the right with B. Black is in no serious trouble, and the game is close to even. ]))
(;W[dk];B[dg];W[eh];B[dj];W[ci];B[dl]TR[df]LB[dj:A]C[Black A threatened to save the two marked stones. Capturing with a ladder, Black has a good position. ]))
(;W[gh];B[cn];W[co];B[dn];W[fp];B[cj]LB[fi:A]C[This is easy for Black, and Black still has an annoying ladder breaking move at A. ]))
(;W[dg];B[ef];W[df];B[eb];W[cn]C[White usually chooses this variation when the ladder in the game is bad for White. In this case it's feasible for White because the upper side is relatively small. ]))