(;CA[shift_jis]AP[MultiGo:4.4.4]EV[ DeepZenGo vs. Cho Chikun 3-game match, game 3]
DT[2016-11-23]PB[Cho Chikun]BR[9p]PW[DeepZenGo]WR[NR]KM[6.5]RE[B+R]SO[Go4Go.net]
MULTIGOGM[1]
C[White:  Deep Zen Go
Black:  Cho Chikun 9p
Game 3
Commentary:  Michael Redmond 9p
2016-11-23]
;B[pd];W[dp];B[pq];W[dd];B[fq];W[cn];B[pk]C[Leaving the kakari to play a Chinese opening, Black is inviting a fight on the lower side (see var). ]
(;W[mp];B[jp]C[The 5-6 exchange works well for Black in this variation. ];W[po]
;B[oo];W[on]C[If Black extends, White will slide into the corner (see var).]
(;B[op];W[pm];B[nn]C[Now I want to attach in the corner, but maybe that would not be Zen's style (see var). ]
(;W[nm];B[mm];W[nl];B[mo];W[ml];B[lm];W[qf];B[qh];W[of]C[Black's right side will be forced into a small life if it gets closed in (see var).]
(;B[oh];W[nd];B[rd];W[mg];B[nc];W[mc];B[oc]C[Black makes miai of the cut and moving out with the right side group (see var). ]
(;W[ni];B[md];W[ld];B[me];W[le];B[ne];W[oe];B[lc];W[mb];B[od]LB[kc:A][nf:B]C[A and B are miai. ]
;W[kc];B[nf];W[ng];B[og];W[mf];B[nd]C[Black has saved the right side group while taking a sizable territory, so this is very efficient for Black. However it is not decisively good for Black because White has a huge moyo. ]
;W[dg];B[dc];W[cc];B[ec];W[cb];B[gc]LB[ic:A][fe:B]C[Black makes miai of A and B.]
;W[hq]C[Although Black might seem to have a sizable lead in territory, that lead will disappear if White can surround the left side efficiently. ]
;B[dr]C[Having no way to capture White A, Black wants to use a running fight to reduce White's potential on the left side (see var). ]
(;W[jq];B[kq];W[kp];B[lp];W[ko];B[lq];W[ip];B[cq];W[eq];B[er];W[fp];B[ci]C[Black has a sizable lead in territory. However, Black's groups on the upper and left sides are weak, and the game is still undecided. ]
;W[ch];B[di];W[fh];B[cl]LB[hb:A]C[This would be a good time for White to attack at A. ]
;W[qi]C[This attachment is the tesuji to reduce Black's right side. The timing of this move was a suprise, since White should attack strongly on the upper side, and has potential to create a double attack on the upper and left side Black groups. ]
;B[pi];W[qj];B[pj];W[rh];B[qk];W[rk];B[rg];W[qg];B[ph];W[ri];B[rf];W[ql];B[fe]C[On the right side, Cho accepted a local loss in order to take sente and defend the upper side with this move. ]
;W[fr];B[bo]C[White should play the tsukekoshi now (see var). ]
(;W[co]C[I added vars for this move to show White's correct play. This relatively simple mistake took the pressure off Black on the left side, and I think that in the var White has an advantage, while in the game it is even or a small lead for Black.]
;B[bp]LB[bn:A]C[White A is not forcing. White now has no effective attack on Black's left side group. ]
;W[ic];B[ib];W[ej];B[bm];W[kl];B[km];W[ed];B[fd];W[fb];B[hc];W[id];B[eb]C[White should now surround the center (see var). ]
(;W[jb];B[eg];W[eh];B[df];W[cf];B[de];W[ce];B[ee];W[cd];B[fg];W[qp];B[qq];W[rq]
;B[gh];W[dh];B[rr];W[hh];B[gi];W[hg];B[gg];W[oa]LB[nb:A]C[The difference between this and a Black play at A is big. ]
;B[bh];W[bg];B[ei];W[bi];B[fi];W[ah];B[jr];W[jo];B[ir];W[fm];B[qn];W[pn];B[rp]C[This move is a very big yose. ]
;W[ro];B[sq];W[pb];B[rn];W[qc];B[qe];W[ij];B[ll];W[lk];B[sl]C[Black peeps to reduce White's eyes. White shuld take sente to protect in the center, but will lose a few points in the process (see var). ]
(;W[qo];B[so];W[rl];B[kk]LB[mk:A]C[White cannot save one stone in the center because of the cut at A. ]
;W[lj];B[jl]C[After this Black is winning. ];W[kj];B[in];W[hn];B[nj];W[bn];B[an]
;W[db];B[ea];W[ln];B[mn];W[bk];B[mi];W[li];B[jj];W[ji];B[mk]LB[oj:A][ol:B]C[If White A, Black B will capture the right side White group. 

Looking back at this 3 game match, Zen plays well in the opening and in open areas that are difficult even for top pros to judge. It makes local mistakes, a problem that seems to be a characteristic weakness of the neural network system. It is playing at a pro level, and is approaching the strength of AlphaGo that we saw in March 2016. In Game 2 I saw some patterns that Zen has been playing for years, so it has not turned into a copy of AlphaGo, but has kept it's original 'style'. ])
(;W[rm];B[sm];W[so];B[qo];W[jl]LB[rl:A]C[Please note that Black cannot cut at A. However, White has lost several points in the LR corner area, and Black has a small lead now. ]))
(;W[gf];B[jb];W[jl]C[This will be a close game. ]))
(;W[bp];B[cp];W[co]C[2 vars for Black's next move]
(;B[bq];W[bn]LB[ao:A]C[White has thick shape and can continue to attack Black on the left side. White A is sente next, so White takes profit in territory as well. ])
(;B[bn];W[bm];B[bq];W[an];B[ap];W[cm]C[Black's left side is weak. ])))
(;W[cq];B[ep];W[ho];B[eo]C[This running fight looks like it will move into the left side and reduce White's potential territory. ]))
(;W[md];B[mh];W[lh];B[mi]C[White's LR group is not settled yet, so this is good for Black.]))
(;B[nd];W[oh]C[The right side group will not die, but it looks painful for Black to make life. ]))
(;W[qq]C[If Black answers in the corner, this will be a kikashi (var).]
(;B[qr];W[nm];B[mm];W[mn];B[no];W[nl]LB[qp:A]C[Later White A is a big move. In this var, White's attachment at R3 has become a kikashi, and this is better for White than the game. ])
(;B[nm];W[qr];B[pl];W[rm];B[mo];W[nc]C[White has scooped out the corner, while Black has thickness. I would call this an even result, but since Zen gives a high value to the center, I think it would choose Black. ])))
(;B[no];W[pp];B[oq];W[qq];B[qr];W[rr]C[Black cannot capture White's double hane (see var)]
(;B[rq];W[qp];B[rs];W[op];B[np];W[pr];B[sr];W[nq];B[or];W[mn]C[Black collapses])
(;B[qp];W[rq];B[pn];W[qo];B[qn];W[ro];B[nq];W[qf]TR[on]C[The marked White stone still has some aji, so this looks good for White.])))
(;W[jp];B[lp];W[eq];B[fp];W[hp]LB[fn:A]C[Next Black A, maybe. This has been played in pro games and seems to be an even fight. ]))
