(;GM[1]FF[4]SZ[19]AP[SmartGo:3.0.1]CA[utf-8]
GN[2017.04.27_master-ke-jie51-kgscomments-final]
PW[Master]WR[9p]
PB[Ke Jie]BR[9p]RO[50]
DT[2017-01-03]
PC[Fox]
KM[6.5]
RE[W+Resign]
RU[Japanese]ST[2]
TM[60.0]TT[30]MU[1]
C[Commentary by Michael Redmond 9P.

In this game, Ke Jie tries Master's moves on the AI: up to Black 13, this is actually the same fuseki as in Game 20, with Master as Black and Park Junghwan as White. Ke Jie plays Master's moves with Black, maybe to see how Master is going to handle it.]
;B[pd];W[pp];B[cd];W[dp];B[ic];W[qf];B[nd];W[qc];B[qd];W[rd];B[cn];W[fq]
;B[dg]
C[Up to Black 13, this is actually the same fuseki as in game 20, with Master as Black and Park Junghwan as White. Ke Jie plays Master's moves with Black, maybe to see how Master is going to handle it. The var for White 14 shows some of the Master-Park game. ]
(;W[ec]TR[rb]
C[While many human players think that the kaketsugi (marked) is a big point, Master seems to attach relatively little value to it. Invading the Chinese opening low at 14 is unusual in human play before the Master games. ]
;B[dc];W[de]TR[ed]
C[Pressing at 16 seems to be the default move for Master, whether Black has attached at 15 or not. When Black already has a pincer stone at 5, it is heavy for White to extend at the marked point. ]
;B[dd]
C[Two vars are added for White18. ]
(;W[eg]
C[With this probe White asks if Black will play towards the UL corner or the left side.]
;B[eh]
C[Ke Jie continues to put pressure on White, trying to attack the entire group. ]
;W[ed];B[ee];W[ef];B[fe];W[df];B[fh]
C[Black 25 is a strong move. White cannot cut at the 4th line (see var). ]
(;W[db]
C[White 26 is a tesuji. If Black covers in the corner, White will be able to move into the left side (see var). ]
(;B[cg]
C[Black 27 is another strong move. ];W[bd]
C[White 28 is the tesuji that attacks Black's damezumari (shortage of liberties). ]
;B[ce];W[cf];B[be];W[bf];B[bc];W[gg]
C[White escapes into the center. ];B[fc];W[eb];B[fd]
C[Black threatens to cut in the center. There is a step ko left in the corner, which I will show as a variation for White 42. ]
;W[hf];B[ge];W[gf];B[ci]
C[Black 41 is the vital point in shape, and is necessary to prevent a White play at the same point. ]
(;W[hi]
C[At first I thought that this was good for Black, but with the ko left in the UL corner I must change that to even or maybe slightly better for White. It is urgent for Black to reinforce the left side now (see 3 vars for Black 43). ]
(;B[pc]
C[Playing away from the left side with was a mistake, as it allowed White to invade.  ]
;W[dk]TR[cj]
C[After invading at 44, White has a follow-up move (marked) that will give White a resilient shape. After this move Master takes control of the game. ]
;B[gj];W[dm];B[dn];W[cj]
C[White cuts Black off while making eye shape. ];B[em]
C[Having no way to connect underneath, Black must try to surround from the center. ]
;W[di];B[dh];W[el];B[fm];W[fl];B[gl];W[gm];B[hl];W[cm]
C[With 58, White already has a living shape. ];B[eo];W[gn];B[ep];W[fo];B[en]
;W[eq];B[bm];W[bl];B[dq];W[cq];B[dr];W[cr];B[fp];W[gp]
C[Cutting the one stone is not good enough for Black (see var). ]
(;B[ds]
C[Black makes miai of the corner and the outside cut (see var). ]
(;W[iq];B[cp]
C[There is some aji in the corner, but it is premature for White to attack immediately (see var). ]
(;W[gi]
(;B[bn]
C[Black completes the corner territory. ];W[fj]
C[White captures the left side. With thickness in the center, White now has a decisive lead.
End of commentary. ]
;B[rc];W[qi];B[nq];W[oq];B[np];W[pn];B[kq];W[jo];B[ln];W[lo];B[mo];W[lp]
;B[ho];W[go];B[kn];W[im];B[nm];W[af];B[ad];W[ol];B[pj];W[pi];B[nl];W[nk]
;B[oj];W[om];B[ll];W[qj];B[il];W[jm];B[jl];W[lq];B[ok];W[mj];B[oi];W[oh]
;B[ni];W[nn];B[mn];W[km];B[oo];W[kl];B[po];W[qo];B[qp];W[qq];B[rp];W[qn]
;B[rq];W[lk];B[ml];W[rr];B[qr];W[pr];B[pq];W[fb];B[gb];W[qq];B[ql];W[qs]
;B[on];W[pm];B[mk];W[lj];B[pl];W[ro];B[nj];W[lh];B[pg];W[qg];B[ph];W[re]
;B[jf];W[lf];B[ig];W[jh];B[ke];W[ie];B[jd];W[bj];B[ej];W[fi];B[jn];W[in]
;B[op];W[pq];B[ei];W[dj];B[al];W[bk];B[rj];W[ri];B[qm];W[sq];B[rn];W[sp]
;B[rk];W[qh];B[og];W[rg])
(;B[fj];W[fi];B[ei];W[ej]LB[bn:A]
C[Capturing at A is sente for White, so White can cut Black off. ])
(;B[ej];W[fi];B[ei];W[fj]LB[bp:A]
C[Black gets cut off. While Black will be able to live on the side in this var, he also has to worry about White A in the corner. ]
))
(;W[bp];B[do];W[bo];B[bn];W[ar];B[bk]
C[White is in trouble on the side. ]))
(;W[bp];B[gq];W[gr];B[hq];W[fr];B[hp];W[go];B[hm]
C[Black captures 5 White stones in the center. ]))
(;B[cp];W[ds];B[do];W[er];B[bo];W[gi]LB[am:A]
C[White A is forcing, so White's side group is still alive. This is good for White. ]
))
(;B[gk]LB[dm:A][fj:B]
C[My first idea is this direct attack on White in the center. The weakness of this move is that White A is an effective way for White to invade the left side, with the threat of White B later. ]
)
(;B[hk];W[gj];B[gk];W[fj];B[dl]
C[This var puts pressure on White in the center, and seems to be a feasible way for Black to play. ]
)
(;B[en];W[co];B[bn]LB[gp:A]
C[The most steady way for Black to play, attacking the center from a distance and setting up the katatsuki at A. ]
))
(;W[cb];B[bb];W[ad];B[ae];W[ba];B[fb];W[ab];B[ac];W[bd]LB[cc:A]
C[This is a step ko, in that White needs one more move at A to make it a direct ko. While Master's handling of ko positions has become better (from the human perspective) it still seems to make mistakes when playing indirect kos, and also seems to attach low values (compared to human pros) to them. A human would locally read this out and then decide when to play it, but of course Master has a different cognitive process that I do not fully understand. ]
))
(;B[cb];W[bd];B[ce];W[cf];B[be];W[bf];B[bc];W[ci]TR[dg][eh:fh][cn]
C[Good for White. Note that the marked Black stones have become inefficient. ]
))
(;W[dh];B[cg];W[ch];B[bf]
C[All three White groups are in trouble. ]))
(;W[id];B[jd];W[je]
C[In game 22 of the 60 game series, Master played this attachment in a similar Chinese opening. ]
)
(;W[ed]
C[Covering is an overplay. ];B[ee];W[ef];B[fe];W[df];B[cg]
C[This fight is good for Black. ]))
(;W[rb]
C[Park took local profit in the UR corner with 1. ];B[en];W[co];B[bn];W[ip]
;B[go];W[gp];B[ho]
C[Master expands the moyo. ];W[ej]LB[hd:A]
C[In my commentary of the game, I suggested that Park should have invaded at A with this move. ]
;B[gh];W[gj];B[ii];W[cj];B[di];W[dj];B[hk];W[bh];B[bg];W[eh];B[eg];W[cg]
;B[ch];W[cf];B[bi]
C[In this game Master showed that it can handle a complicated fight, and it took a decisive lead here. ]
))

