(;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]
GN[Dennou Sen]PW[DeepZenGo   ]PB[Cho Chikun]WR[1p]BR[9p]DT[2016-11-19]US[www.cyberoro.com]C[In the second “Man vs. Machine” match of the year, Deep Zen Go is taking on the legendary Cho Chikun 9P (honorary Meijin) in a 3-match series being held November 19th, 20th and 23rd. Michael Redmond 9P and Antti Tormanen 1P are providing live commentaries on the matches in English on the NiCONiCO website. The second game will be played on November 20 (Saturday, November 19 in the US; commentary will begin at 11p EST. 

Here Redmond provides highlights of his commentary.
]RE[B+Resign]MU[1]
;B[qe]C[Zen played a pro level opening and middle game, but lost in the endgame. ]
;W[pp]
;B[ec]
;W[dp]
;B[cn]
;W[fq]
;B[cf]C[After the game, Cho Chikun was saying that he had studied some of Zen's games, and decided to play an opening that was not in that set of games, thus playing an opening that might not be in Zen's experience. ]
;W[pc]
;B[nc]
;W[od]
;B[nd]
;W[pf]
;B[qf]
;W[pg]
(;B[qh]C[Jumping here is a bit unusual (see var). ]
;W[qd]
;B[qg]
;W[pe]
;B[qb]C[Black is trying to pressure the white group by taking it's eye shape away. ]
;W[rc]
;B[pb]
;W[qj]C[On the right side, White has potential to attack Black. ]
;B[ph]
;W[ng]
;B[nh]
;W[mh]
;B[ni]
;W[lg]
;B[qn]LB[pk:A]C[Black is playing aggressively here. I had been expecting a Black move at A. ]
;W[pm]C[Black's side group is not alive yet, so it is correct for White to move out like this. ]
;B[pn]
;W[on]
;B[oo]
;W[qm]C[Giving Black immediate profit in the LR corner, White sets up an attack against Black's side group. ]
;B[po]
;W[qp]
;B[op]
;W[nn]
;B[oq]
;W[lj]
;B[pj]
;W[pk]
;B[mk]C[Instead of making a small life, Black chooses to break through in the center. ]
;W[oj]
;B[mj]
;W[mi]
;B[nj]
;W[lk]
;B[mm]
;W[mn]
;B[ll]
;W[nl]
;B[ml]
;W[pr]
;B[or]
;W[lc]LB[ro:A][kq:B]C[The fighting is complicated, and it is difficult to say who is ahead. In the lower left, Black can capture the corner with A or extend to B, and these two points are miai. Black must play in the upper right now to save his corner group. Black's right side group has only one eye, but is out in the center and is safe for now. ]
;B[ld]
;W[kd]
(;B[le]C[Black fights strongly with this extension. ]
;W[kc]
;B[ke]
;W[je]
;B[jf]
;W[kf]
;B[ne]
;W[og]
;B[pi]
;W[if]
;B[jd]
;W[ie]
;B[ic]
;W[hc]
;B[hb]
(;W[gc]C[It is correct for White to sacrifice the  side stones (see var). ]
;B[id]
;W[hd]
;B[jb]
;W[gb]
;B[kb]
;W[lb]
;B[mb]
;W[ha]
;B[ib]
;W[cc]LB[he:A]C[White attacks the corner to forestall Black A. ]
;B[ee]
;W[ce]LB[eb:A]C[Simply connecting at A was better. ]
;B[be]
;W[de]
;B[df]
;W[ef]
;B[ed]
;W[bd]
;B[bf]
(;W[db]
;B[eb]
;W[bb]
;B[da]LB[ca:A][dc:B]TR[ce][de]C[If White A, Black can play at B to fight a ko or capture the marked two stones. ]
;W[kn]C[White returns to the fight in the center. ]
;B[jl]
;W[im]
;B[il]
;W[hm]
;B[hl]
;W[gl]
;B[gk]
;W[fk]
;B[gj]
;W[ij]LB[jg:A]C[White forestalls Black A, and puts pressure on the Black group. It is still not apparent which side is ahead. ]
;B[fj]
;W[fl]
;B[rn]LB[ro:B][kq:A]C[Such a simple mistake is hard to believe. It is probably better to simply extend at A, but if Black wants to capture the corner, he must play at B. ]
;W[lq]C[White has a potential ko in the LR corner. ]
;B[dk]
;W[pq]C[Black cannot kill the corner without ko. ]
;B[rq]
;W[rp]
;B[rs]
(;W[qr]C[White misses the ko, letting Black off the hook. In local positions such as this that require reading ability, it seems clear that humans are still superior. ]
;B[sp]
;W[so]
;B[sq]
;W[ro]
;B[rr]
;W[ej]
;B[jj]
;W[ii]
;B[jm]
;W[jn]
;B[ek]
;W[dm]
;B[gm]
;W[gn]
;B[ei]
;W[ca]TR[ce][de]C[White saves the UL corner. This is a large move in territory, and at this point in the game White is ready to sacrifice the marked stones. ]
;B[fm]
;W[el]
;B[cp]
;W[do]
;B[co]
;W[cq]
;B[cm]
;W[cl]
;B[ck]
(;W[ka]C[This move lost 2 pts (see var). Such local mistakes seemed to be a problem even with AlphaGo, but in the challenge match against Lee Sedol it was usually far enough ahead that they were not important. ]
;B[ja]
;W[la]
;B[mc]
;W[ga]
;B[ma]
;W[eg]TR[ce][de]C[Extending here to force Black to capture the marked two stones was a good play for White. ]
;B[cd]
;W[ea]
;B[dd]
;W[dh]
;B[gg]
;W[ff]
;B[di]
;W[ch]
;B[eh]
;W[dg]
;B[bh]
;W[bi]
;B[ah]C[Black is alive on the left side. ]
;W[ci]
;B[kk]
;W[fh]
;B[gh]
;W[fi]
;B[dj]
;W[gi]
;B[hi]
;W[fg]
;B[bl]
(;W[fn]LB[mr:A]C[Maybe this move was White's last chance to force with White A. White A threatens a ko in the LR corner (see var) so it is sente.  At this stage of the game, A is sente for Black also, making it double sente and a free 7 points for the player that gets it first. If White had played at A now, White would have been winning. ]
;B[ih]
;W[hj]
;B[ji]
;W[jh]
;B[hh]
;W[gf]
;B[kh]
;W[jg]
;B[mr]C[This double sente 7 pt move was decisive. After this, Black is ahead. ]
;W[lr]
;B[bq]
;W[hg]
;B[mf]
;W[mg]
;B[rm]
;W[qs]
;B[sn]
;W[ss]
;B[qo]
;W[cr]
;B[mq]
;W[lo]
;B[hk]
;W[ig]
;B[qk]
;W[ql]
;B[rk]
;W[br]
;B[dl]
;W[em]
;B[li]
;W[re]
;B[rf]
;W[lh]
;B[ki]
;W[bp]
;B[bo]
;W[oc]
;B[ob]
;W[sf]
;B[sg]
;W[af]C[I have come to recognize this type of self destructive forcing move as a signal that the program is about to resign. This is a characteristic of programs that use Monte Carlo type algorithms that apparently has no cure. ]
;B[ae]
;W[rl]
;B[sl]
;W[sk]
;B[sj]
;W[ia]
;B[jc]C[The game ends. Zen played a pro level opening and middle game, but lost in the endgame. The second game will be played on November 20 (November 19 in the US; commentary will begin at 11p EST. ])
(;W[mr]
;B[em]
;W[qs]
;B[sn]
;W[os]
;B[ns]
;W[nr]
;B[ps]
;W[ae]))
(;W[la]
;B[mc]
;W[ia]
;B[ka]
;W[ga]
;B[ma]C[ 2 points better than the actual game for White. ]))
(;W[os]
;B[mr]
;W[rr]
;B[sr]
;W[qr]
;B[sp]
;W[so]C[The corner is a ko. ]))
(;W[bb]
;B[db]
;W[ac]
;B[he]C[White can live in the corner, but Black captures the upper side, this is good for Black.  ]))
(;W[ib]
;B[hd]
;W[id]
;B[gc]
;W[jc]
;B[mf]
;W[mg]
;B[mc]C[Good for Black]))
(;B[kc]
;W[le]
;B[md]
;W[jc]
;B[kb]
;W[jd]
;B[lb]
;W[kn]LB[dd:A]C[Cutting at Black  is the safe move. White's plan is to create a thick shape on the right side and maybe then continue on the lower side with 8. The invasion at A in the UL corner is also a move White wants to play soon. ]))
(;B[qg]
;W[ph]
;B[qi]C[The usual joseki.]))
