(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]TM[7200]OT[3x60 byo-yomi]
PW[Cho Chikun]PB[DeepZenGo]WR[9p]BR[1p]DT[2016-11-20]US[www.cyberoro.com]C[White:  Cho Chikun 9p
Black:  Deep Zen Go
Game 2
Commentary:  Michael Redmond 9p
2016-11-21]RE[B+Resign]MULTIGOGM[1]
;B[pd]
;W[dd]
;B[qp]
;W[eq]
;B[cq]
(;W[dn]C[This is an unusual move see var for the more common play.]
;B[co]
;W[cn]
;B[ep]
(;W[fq]
;B[eo]
;W[iq]
;B[gp]
;W[gq]
;B[dj]
;W[ch]
(;B[fm]C[Black from above is correct (see var). ]
;W[dl]
;B[dh]
;W[dg]
;B[eh]
;W[ci]
;B[cj]
;W[bo]LB[ek:A][fl:B]C[White should have moved out at A or B with this move. ]
;B[fk]LB[bo:A]C[Surrounding White is a good move. With White's mistake at 24, White is cramped on the side and the game looks good for Black. ]
;W[cp]
;B[bp]C[Tesuji. ]
;W[do]
;B[dp]
;W[ek]LB[dq:A]C[White is trying to make an effective ko threat for the ko at A. ]
;B[ej]
;W[fn]
;B[en]LB[gn:A]C[It was better for Black to play at A, making White's ko threat more difficult to choose, and giving Black a better connection. ]
;W[dq]
;B[co]
;W[em]C[This becomes the perfect ko threat, and White is out of trouble now. ]
;B[fl]
;W[cp]
;B[el]LB[cd:A]C[A ko threat at A might have been better. ]
;W[co]
;B[dm]
;W[bq]C[White escaped, and took more than 20 pts in the LL. Black has strong thickness, and this looks about even. ]
;B[fc]
;W[db]
;B[df]C[Black aims to create more thickness (see var for 46). ]
(;W[eg]C[This move took me by suprise. Getting into a fight right next to Black's strong wall is a bad idea.]
;B[cf]
;W[cg]
;B[ee]
;W[ed]
;B[fe]
;W[fd]
;B[ge]
;W[gd]
;B[he]LB[gg:A]C[I thought to close White in with A, but since Black has a huge wall, White cannot accomplish much in the center anyway, so this extension is actually a good move in that it is stronger towards the upper side. ]
;W[bf]
;B[be]
;W[af]
;B[ae]C[59 is better not played. ]
;W[bh]
;B[ce]
;W[bj]
;B[ic]
;W[ef]
;B[de]
;W[hb]
;B[bk]
;W[ai]
;B[ib]
;W[bc]
;B[pf]C[In the UL fight, White's territory has dwindled to a total of about 35 pts, and Black's potential in the center and upper and right sides is superior to White's territory. ]
;W[op]
;B[pn]
;W[qq]
;B[rq]
;W[pq]
;B[no]
;W[qj]
;B[qh]
;W[pc]C[White is behind, but since he has more territory and is jumping into Black's moyo, this is Cho's favorite type of game. ]
;B[oc]
;W[ob]
(;B[qc]
;W[pb]
;B[od]C[This variation is not orthodox, but since White does not have enough eye space, Black can make a strong attack here. ]
;W[qb]
;B[rc]
;W[mc]
(;B[lb]C[Black should bump on the 3rd line first (see var). ]
;W[mb]
;B[nc]C[Played out of order, this is not sente now. Black has missed a chance to attack decisively. ]
;W[me]
;B[nb]
;W[na]
;B[ke]
;W[kd]
;B[mg]
;W[kb]
;B[jd]
;W[lc]
;B[ql]C[White is alive now. White has about 40 pts of territory, plus some potential on the lower side. Is Black can make the right side into a solid territory, Black will win. ]
;W[rr]
;B[ld]
;W[kc]
;B[le]
;W[rb]
;B[ag]C[Any pro will cringe at this kind of mistake, as Black throws away valuable ko threats. Some people blame this kind of move on the monte carlo algorythm, but in this case when Zen is winning and the next move is not easy to choose, I think it must be caused by the time control. Zen has a self imposed time control that is meant to prevent it from getting into time trouble, so I think this move might just be a time gaining move, such as humans will play when in overtime. ]
;W[bg]
;B[ak]
;W[aj]
;B[ml]
;W[md]
;B[mf]
;W[gg]LB[if:A][kg:B]C[White is aiming at weak points in Black's wall, such at White A or B. ]
;B[hh]LB[ig:A]C[This was the strongest move, but I think it was a bit greedy. After this move Black lost it's advantage. Playing solidly at Black A was better aji, and good enough to win. ]
;W[hg]
;B[ig]
;W[ih]
;B[ii]
;W[jh]
;B[jg]
;W[hi]
;B[gh]
;W[ji]C[Suddenly it is not clear who is ahead. The fight in the center has gained momentum, making it hard for Black to stop attacking. If White can live inside, Black will not have enough territory. ]
;B[ij]
;W[jj]
;B[jl]
;W[kg]LB[mj:B][mk:A]C[White wants to see how Black protects the upper side, so White's hane was meant as a probe. However, Cho overlooked Black's strong response. I was expecting White to attach at A with this move. After the game Cho said that he should have played at B. In any case, is seems that White should move towards the right side, where there is more room to make eyes. ]
;B[lh]LB[lf:A]C[This kosumi was a strong move. White has a possible cutting move, at A for instance, but the White group in the center must have more than 10 liberties for this to work. Meanwhile, Black's kosumi at 129 has narrowed White's oossibilities on the right. ]
;W[kl]
;B[km]
;W[jk]
;B[il]
;W[lj]
;B[kk]
;W[nj]
;B[kj]LB[ll:B][nl:A]C[This move leaves a lot of aji with a White attachment at A. It was better for Black to play at B.]
;W[pl]
;B[qk]
;W[pk]
;B[pm]
;W[li]
;B[mi]
;W[lf]
;B[je]
;W[nh]
;B[mh]
;W[mj]
;B[ki]LB[ll:A][nl:B]C[Since Black is going after the whole group, it was not necessary to cut of the stones in the center. Black should have played at A, which is necessary to prevent White from making an eye with the attachment at A. ]
;W[ph]
;B[og]
;W[rl]
;B[qm]
(;W[nl]C[I was expecting White to bump on the 3rd line (see var). ]
;B[rj]
;W[qi]
;B[ri]
(;W[nm]
;B[mn]
;W[oo]
;B[on]
;W[oh]
;B[pj]
;W[pi]
;B[ok]C[With this eye taking tesuji, Zen finally manages to kill the group. ]
;W[pg]
;B[qg]
;W[of]
;B[nf]
;W[ng]
;B[ne]
;W[qf]
;B[pe]
;W[rf]
;B[rh]
;W[kh]
;B[ll]
;W[ik]
;B[kf]LB[ih:A]C[Cho started badly, but with the cut at 118 (A), he managed to make it interesting. With Zen making mistakes in the attack, Cho had some chances to live on the right, and have a close game at least. Before it used the AphaGo type self-learning, killing groups was Zen's strongest point, but its attack was not well-executed in this game. It's improvement to pro level has been in the opening, and positional judgement. ])
(;W[mm]
;B[lm]
;W[mk]
;B[ll]
;W[om]
;B[mn]
;W[oh]C[White is alive. ]))
(;W[qi]
;B[qg]
;W[rk]
;B[ri]
;W[rj]
;B[rh]
;W[rm]
;B[oi]
;W[oj]
;B[rn]
;W[nl]
;B[nm]
;W[mm]
;B[mn]
;W[om]
;B[nn]
;W[mk]
;B[ll]
;W[sm]C[White is alive. ]))
(;B[nc]
;W[nb]
;B[lb]
;W[mb]
;B[lc]
;W[md]
;B[mf]
;W[ld]
;B[kf]C[Starting with Black 1 is the correct order of moves. With his legendary ability to squeeze out of dangerous positions, maybe Cho Chikun can live with this group, but it will not be easy. ]))
(;B[od]
;W[pb]
;B[nb]
;W[qd]
;B[qe]
;W[rd]C[The overall position is not bad for BLack, but in this var Black is letting White live too easily. ]))
(;W[cf]
;B[eg]
;W[cg]
;B[de]
;W[cd]C[I would choose this var if I was playing with White. ]))
(;B[bo]
;W[cr]
;B[br]
;W[dq]
;B[cp]LB[bs:A]C[Playing at Black 1 migfht seem to be a vital point, but it is not effective. Later White can force with 2 and 4, and finally White will have potential for a ko at A. Since Black is not fully alive, playing at 1 is small. ]))
(;W[dp]
;B[dq]
;W[fp]
;B[eo]
;W[do]
;B[fq]
;W[er]
;B[fr]C[The ladder favors Black. ]))
(;W[do]
;B[co]
;W[cn]
;B[dn]
;W[cp]
;B[bo]
;W[dp]
;B[bp]
;W[cm]
;B[dq]
;W[ep]
;B[en]
;W[dk]
;B[ip]C[A fighting start.]))
