(;GM[1]FF[4]SZ[19]AP[SmartGo:3.0.1]CA[utf-8]
GN[RR06-master17_Master-Lian_Xiao-2_annotatedKGS-final]
PW[Master]WR[9p]
PB[Lian Xiao]BR[7p]
DT[2016-12-30]
PC[The KGS Go Server at http://www.gokgs.com/]
KM[6.5]
RE[W+6.50]
RU[Japanese]ST[2]
TM[60.0]TT[20]
C[Commentary by Michael Redmond 9P, hosted by Chris Garlock

Lian Xiao is ranked among the top ten players in the world. He has a strong fighting style. In this game Master/AlphaGo plays a truly unorthodox move early in the game, and goes ahead to take control. I could not find any obvious mistakes to blame for Lian losing the game, but think that he placed too much emphasis on local fights while falling behind in the overall position. ]
MU[1];B[qe];W[pp];B[pc];W[dc];B[cp];W[eq];B[ce]
C[This opening is already unusual in the position of the two LL corner stones, and the Black shimari in the UR corner. Also, diagonal openings are less common than parallel in general. AlphaGo's next move came as a surprise, so I have added some variations to show what I think are more natural continuations for White. ]
(;W[cd]LB[do:A]
C[I would not play this move myself, but I can attempt an explanation as to why it could work. While I suggested pressing at A with this move, AlphaGo is hoping to press later at A. My next comment is at White 10. ]
;B[de];W[fc]
C[The reason that White 1-3 is usually considered bad is that it strengthens Black and makes the 3 space extension a good move (see var). ]
(;B[do]
C[To avoid White playing at the same point, Black's kosumi at 11 seems to be a natural move. ]
;W[ci]TR[cd]
C[White got to pincer anyway, so what was wrong with the marked kosumitsuke? It looks perfectly natural now, so I guess it was good enough. Nonetheless, I still would prefer to press at 11 with White 8. ]
;B[ck];W[dk];B[cl];W[fe]
C[Capping the opponent is often good in a running fight. White 16 stops Black from jumping straight into the center and gives White a strong and high position on the upper side. ]
;B[ff];W[ge];B[ei];W[dj]
C[Attacking immediately will not succeed (see var). ]
(;B[fp]
C[It is not good for White to answer on the lower side (see var). ]
(;W[dl];B[cm];W[gk];B[gi];W[ik];B[ch];W[cq]
C[White 28 is a common tesuji to make sabaki in the LL corner (var for Black 29). ]
(;B[bq];W[br]
C[White 30 is another tesuji (see var). ]
(;B[cr];W[dq];B[bs];W[gq]LB[bp:A][dr:B]
C[White can force with A or B later, depending on how the position develops. 28~33 was a profitable exchange for White. ]
;B[nq];W[lq];B[no];W[qn];B[iq];W[ar];B[aq];W[eo];B[kp];W[gp]
C[White 44 threatens to cut on the left (see var). ]
(;B[as];W[dn];B[cn];W[jr]
C[Black cannot cover (see var). ]
(;B[lp];W[ir];B[dm];W[oc]
C[As in many of its games, AlphaGo controls the flow, leaving local positions to get the big points first. ]
;B[od];W[nc];B[pb];W[nd];B[oe];W[kd]
(;B[qq];W[pq];B[pr];W[or];B[qr];W[nr];B[ro];W[mq];B[rn];W[bh]
C[Finally White starts an attack. Some players would be tempted to attack her earlier, say directly after Black 27. In preparation White has a territory on the upper side that can potentially built on, and a weak Black group on the lower side to attack, so White 68 has become more effective as the game progresses. ]
;B[dh];W[bg]TR[dm];B[be];W[fh];B[el];W[ek]
C[There is a weakness in White's shape that makes this position dangerous, but AlphaGo seems to have a plan (see var). ]
(;B[fg]TR[dm];W[gh]
C[The cut on the second line does not work yet (see var). ]
(;B[hh];W[ef];B[df];W[gg]
C[Black still can't cut (see var). ]
(;B[fi];W[fl]LB[bi:A]
C[White finally protects, erasing the potential cut at A. Black's group is not alive, and White is already cashing in on the attack, as 82 is a big territorial move. ]
;B[ii];W[ig];B[ki];W[kk];B[nm];W[mk];B[hg];W[hf];B[eg];W[gf];B[bc];W[cc]
;B[bb];W[bd];B[ad]LB[ee:A]
C[Black has one eye in the corner, and a potential eye at A. ];W[ok];B[pn]
;W[mf]
C[AlphaGo has not done a lot with the attack in the upper left, but was satisfied to simplify the overall position. White is winning, end of commentary. ]
;B[cb];W[db];B[kg];W[jf];B[ma];W[mb];B[qi];W[pi];B[ph];W[qj];B[oi];W[pj]
;B[qh];W[ee];B[mi];W[lm];B[na];W[la];B[ob];W[nb];B[oa];W[lb];B[kn];W[km]
;B[ml];W[nl];B[mm];W[ll];B[lj];W[lk];B[fo];W[ln];B[mp];W[oq];B[qm];W[fq]
;B[em];W[om];B[fm];W[gm];B[gn];W[hm];B[kq];W[kr];B[da];W[ea];B[ca];W[eb]
;B[bj];W[bi];B[fs];W[hn];B[oo];W[ih];B[ij];W[hi];B[hj];W[nn];B[hk];W[il]
;B[lf];W[mg];B[jh];W[le])
(;B[bi];W[bj];B[cj];W[di];B[fk];W[ai];B[ej];W[bi];B[fl];W[eh];B[eg];W[ee]
C[White wins the semeai. ]))
(;B[bi];W[bj];B[cj];W[di];B[fk];W[ai];B[ej];W[bi];B[fl];W[eh];B[dg];W[df]
;B[cf];W[ef];B[eg];W[ee];B[cg];W[gg]
C[White wins the semeai.]))
(;B[bi];W[bj];B[cj];W[di]
C[Does Black squeeze immediately or extend to make 2 stones (see var)]
(;B[fk];W[ai];B[ej];W[bi];B[fl];W[eh];B[dg];W[df];B[ef];W[cf];B[eg];W[ee]
;B[gh];W[gf];B[fi];W[ih]
C[White wins the semeai])
(;B[ai]
C[White cannot take (see var). ]
(;W[fl];B[bk];W[eh];B[dg];W[ef];B[df];W[ee]LB[bd:A][mf:B]
C[White can squeeze with A later, threatening a seki. The upper side White territory will expand if White plays at B, so this is good for White.]
)
(;W[aj];B[fk];W[ah];B[bi];W[ai];B[ej];W[bi]TR[ah:bj][ci:di]
C[The marked stones define the 'sekito shibori' or in English, the stone pillar squeeze shape.  ]
;B[fl];W[eh];B[dg];W[df];B[cf];W[ef];B[ee];W[eg];B[cg];W[bd];B[bk]
C[Black wins the semeai. ]))))
(;B[bi];W[pr]
C[Protecting the left side with 1 is a big move, but then White would have a lead in territory after 2. ]
))
(;B[ir];W[jq];B[jp];W[lp];B[lo];W[ip]
C[White wins.]))
(;B[pr];W[bp];B[as];W[co];B[dp];W[dn]TR[fp]
C[Thanks to the marked stone, White can capture the Black stones. This is a disaster for Black. ]
))
(;B[dq];W[cr]
(;B[dr];W[bp];B[bo];W[ep]
C[Not only can White live in the corner, White has aji on the outside with 6. This is good for White. ]
)
(;B[ep]
C[This would have been a thick way for Black to play. I think this is correct for Black, and the game sequence is questionable. ]
)))
(;B[fq];W[ep];B[eo];W[fr];B[gr];W[dr];B[fs];W[er];B[fo];W[hq];B[gq];W[nq]
C[White is alive in the corner. ]))
(;W[gq];B[fk];W[dl];B[cm];W[fl];B[gl];W[fm];B[gk];W[gm];B[gp];W[hq];B[hp]
C[This becomes a splitting attack, and is good for Black. ]))
(;B[fk];W[dl];B[cm];W[fl];B[gl];W[fm];B[gk];W[fo]
C[Black cannot close White in on the left side, and in this case Black's hasty attack has backfired, allowing White to connect to the lower side. ]
))
(;B[ci]TR[cd][de]
C[If one looks only at the UL corner, the marked exchange is bad for White in that it strengthens Black and makes Black's extension safe. However...]
;W[do];B[co];W[dn];B[cm];W[cn];B[bn];W[bm];B[bl];W[dm];B[cl];W[bo];B[am]
;W[cq];B[bp];W[jq]
C[ White presses at 2, and Black's lower side becomes low and overconcentrated. This is good for White. ]
))
(;W[dh];B[hp];W[cd];B[dq];W[de];B[ep];W[jc];B[dj];W[jq]
C[Although this variation is a feasible sequence, I added it mostly just to show the normal order of play, that is, playing a pincer before the diagonal attachment in the corner. White 1 and Black 2 are pincers. After the pincers, 3 and 4 are played to attack the lone stones. After the sequence to 9, this looks like a balanced opening. ]
)
(;W[ed];B[do];W[ci]
C[White's kosumi at 1 is seen a lot in diagonal openings. Building a strong base in the UL corner, White makes miai of the upper and left sides. ]
)
(;W[do]
C[Since Black has a low position on the left with two stones on the 3rd line, it is natural for White to press with 1, and if one looks at the left side position only, this move has been popular for a long time. ]
;B[co];W[dn];B[cm];W[dm];B[cl];W[dl];B[dk];W[cn];B[bn];W[ck];B[cj];W[bk]
;B[bl];W[bj];B[ci];W[ek];B[dj];W[de];B[df];W[cf];B[dd];W[ee];B[cd];W[cg]
;B[ch];W[ed];B[dg];W[be];B[bd];W[bh];B[bi];W[eg];B[ef];W[ff];B[dh];W[bc]
;B[bf];W[cc];B[bg];W[jp]
C[White's plan here was to force Black into a low and overconcentrated shape on the left side. The whole sequence on the left is taken from a game I played more than 30 years ago, and the position is good for White after 41. ]
))

