(;GM[1]FF[4]SZ[19]AP[SmartGo:3.0.1]CA[shift_jis]
GN[2017.10.13_AlphaGo_selfplay_11 (1)]
PW[AlphaGo]
PB[AlphaGo]
EV[AlphaGo selfplay]RO[11]
KM[7.5]
RE[B+R]
RU[Chinese]
C[AlphaGo vs AlphaGo Game 11
Commentary by Michael Redmond 9P
Editing/transcription by Chris Garlock and Myron Souris

This is a lot calmer than Game 10. There's a lot of fighting that doesn't actually come into the game, but I'll be showing a lot of variations about things that could have happened, so there's a lot of, you might say, hidden reading. And then there's a ko at the end, for the life of a group. ]
;B[pd];W[dd];B[pq];W[cp];B[ep]LB[eq:A]
C[When Black plays this high kakari, AlphaGo almost always answers at A, but can play away sometimes.]
;W[qo]LB[eq:A][op:B]
C[AlphaGo attaches a high value to a kakari against the 3-4 point such as this game move, and this agrees with the human opening theory.  AlphaGo as White has 2 highly valued moves at A and B, and my guess is that they are about equal in the value network.]
;B[np];W[eq]
C[The marked moves are what I would call AlphaGo's 'favorite' moves for joseki.  While AlphaGo played complicated joseki sequences in the Master series when it had human opponents, it has a set of simpler joseki sequences that it favors in the self-played games.]
TR[np][eq];B[fq];W[dq];B[fp];W[cn]
(;B[qk];W[jq];B[em]
C[AlphaGo likes to jump out into the center here, which is multipurpose.  This move creates a strong group, reduces White's potential on the left, and has some potential in the center which is hard to measure, but AlphaGo attached value to.]
;W[lq];B[qp];W[rp];B[rq];W[nc]LB[qc:A]
C[In game 22 of this series, the fuseki was almost identical up to this point.  Instead of this upper right approach, in game 22 White took the corner with A.]
;B[pf];W[fc];B[oc];W[qc]
C[This tricky probe in the corner was played in game 2 of this series.]
(;B[ob]TR[nc]
C[Compared to Black's other choices, this game move gives White less potential on the right , but is less active in punishing the marked stone.]
;W[jd];B[gd];W[gc]
(;B[rf]LB[qc:A][nd:B]
C[When Black descends here, White A has become mochikomi, losing points for White.  In return, White has gained a tempo by controlling the upper side without needing to play the joseki move at B, which is not urgent now.  This is an even trade.]
;W[in]
C[There is an AlphaGo-like feeling to this move that strengthens White's group, weakens Black's group on the left, and reduces the potential of Black's right side moyo.]
;B[cf]LB[dl:A]
C[Black's idea here is to reduce White's potential on the left side, making it difficult for White to gain much from attacking Black's group on the lower side with a move such as White A.]
;W[ol]
(;B[bd]LB[cc:A][em:B]
C[It is unusual for AlphaGo to play this slide.  In general, most pros will agree that it is not necessary for White to immediately answer at A, and depending on the board position, sometimes it will be better for White to play from the side or center and allow Black to take the corner with A.

AlphaGo seems to take that one step further, and say that White's potential from the side or center is more valuable than the corner, and thus sliding at 33 is bad, because it gives White too much potential on the outside.

So, why is AlphaGo playing the slide in this position?  I would say that Black's stone at B is reducing White's potential on the left side and in the center and makes it feasible for AlphaGo to slide in this position.]
;W[pj]
(;B[po]
C[With the marked stone, the value of the right side is less than usual, so it is feasible for Black to play away, as with this big game move that reinforces the lower right corner.]
TR[rf];W[qj];B[ip]
C[Black hits a weak point in White's shape.]
(;W[iq]
C[White crawls, starting to make a base on the side.];B[io]
(;W[ko]
C[A loose shape.];B[hn];W[re]
C[A probe.]
(;B[rd]LB[qe:A][nd:B]
C[White has created some aji at A, which works best after White plays at B.]
;W[im];B[hm];W[hl];B[dp];W[cq];B[cm];W[gl]
C[Instead of answering on the left side, White adds a stone to the center.]
(;B[dn]LB[bn:A]
C[Because A was the good shape move, and thus should be given a high value, I would assume that AlphaGo had A as one of it's options, but discarded that move.]
;W[bn];B[ef]LB[dj:A]
C[With White's stone (marked), the left side is open underneath, and Black is not eager to surround it with a move such as A.  Black's game move here reduces White's potential in the center.]
TR[bn]
(;W[dl]
C[I think White's peep here was an overplay.]
(;B[el]LB[il:A]
C[By pushing out here, Black does take a loss in territory on the left, but I say that this move successfully refutes White's attempt to attack with the marked peep.  The cut at A has become a liability for White.]
TR[dl];W[cl];B[dk];W[ck];B[il];W[km];B[ik];W[dg];B[df];W[hj];B[cj]LB[bm:A]
C[Black's hane here is a sharp move.  Next, Black can push through at A, so White cannot play away.]
;W[dj];B[ek];W[ci];B[bj];W[bi];B[hd];W[hc];B[hk]LB[cj:A][hl:B]
C[Black made a sacrifice on the left starting with A.  This sets up Black's attack here, and White's cutting stones at B have been captured.]
(;W[ho];B[go]TR[gl:hl]
C[After capturing the marked cutting stones the game starts to look good for Black.  It is still very close, so at this point I am expecting a half point victory for Black.]
;W[cc];B[qn];W[ei];B[gj];W[nd]LB[qe:A]
C[With this stone White's play at A has become a real threat.];B[nb];W[lc]
(;B[qh]LB[re:A]
C[Black's big move here removes most of the aji with the stone at A.];W[pg]
;B[qg]
(;W[bc]LB[fh:A]
C[White's move here and Black A are miai.];B[fh];W[of]TR[qc][re]
C[White's outside forcing move here gets some extra value from the marked stones.]
(;B[id]
C[Instead of being forced to answer in gote in the upper right, Black plays away.]
;W[pe];B[qe];W[qf];B[qd];W[ic];B[je];W[if];B[kd];W[jc];B[ie];W[kg];B[hf]
C[Next, the left side and the center are miai for White.]
(;W[dm];B[kl]
C[Black leans on White's group on the lower side, while starting to control the center.  The territory is close.]
;W[ll];B[kk];W[lk];B[lm];W[mm];B[ln];W[kn];B[lj];W[mj];B[mi];W[li];B[bl]
C[Something is going on with the timing of these forcing moves such as this left side move that seems to suggest some human emotions in this AI.]
;W[bm];B[kj];W[nj];B[mn];W[ki];B[nm]LB[mk:A][gk:B]
C[Black's big move here reduces the aji of White's cut at B.];W[hg];B[bk]
;W[cm];B[fi];W[gf];B[ld];W[mb];B[ne]LB[jg:A][mh:B]
C[Black's group on the upper side looks vulnerable, but White has weak shape, with Black moves at A or B.  White cannot successfully attack.]
;W[mg];B[oe];W[mk]
C[White has a living shape on the lower side, with moves on the left and right being miai.]
(;B[hq];W[nr];B[mq];W[mr];B[lp];W[kp];B[lr];W[kq];B[or];W[nq];B[mp];W[hi]
;B[gk];W[oq];B[pr];W[ls];B[op];W[ns];B[lf];W[pf]LB[od:A][rg:B]
C[White's connection here has follow-up moves at A or B that make it more than a simple endgame move.]
;B[ph];W[oh];B[oi];W[mh];B[nh];W[nf];B[og];W[ni];B[me]
C[With this move, Black's group on the upper side is connected to the right.  The game is still close.  White needs to make life for the group in the center.]
;W[ql];B[jf];W[ig];B[oj];W[ok];B[ri];W[rk];B[rm];W[mc];B[od];W[nl]LB[fe:A][pk:B][jh:C][nk:D]
C[White wants to avoid playing the dame point at A, so it wants to make eyes for the group in the center.

White has an eye at B, and a potential eye around C, which can count as a second eye when combined with the eye at D that depends on a ko.  For now, the White group is alive.]
;B[rl];W[bg];B[rj];W[pk];B[dh];W[di];B[bf];W[cg];B[ed];W[fd];B[eh]
C[It might be difficult to see what Black is trying to do here, as White can push through and cut.]
(;W[ch]TR[bj:bl][cj]
C[White's move here is actually large, forestalling a squeeze by Black and reducing the number of stones that White will have to play to capture the marked stones.]
;B[fe];W[om]
C[White could have lived by playing at A, but starts this ko instead.  This might look dangerous, but maybe White has enough ko threats to make it work.]
LB[pm:A];B[ml];W[ng];B[oh];W[mm];B[ah]
C[When the ko involves the life or death of White's group, this ko threat might seem small.]
(;W[ag];B[ml];W[ij];B[lg];W[jj];B[pm];W[mm];B[ec];W[eb];B[ml];W[gh];B[ee]
;W[db]LB[dc:A][ac:B]
C[When compared to a play at A, White's game move here reduces Black's ko threats, and is only a slight loss in territory, as it reduces the value of Black's next endgame move at B.]
;B[mm]
C[Black's connection seems to be a declaration of victory.  Black will win now, by the smallest margin.]
;W[jh];B[kc];W[kb];B[ac];W[ab];B[ad];W[sl];B[bb];W[on];B[sm];W[do];B[en]
;W[qm];B[ro];W[sk];B[er];W[dr];B[ir];W[pn];B[sj];W[qk];B[gr]
(;W[is]
C[A beautiful tesuji.]
(;B[aa];W[sn]
C[ AlphaGo has an annoying habit of throwing away ko threats.  My suggestion that AlphaGo plays these self defeating forcing moves, such as here, to gain thinking time is just a guess, based on the hypothesis that AlphaGo might be using a time control that gives it a certain amount of time for each move.

If I am wrong about this and there is some kink in the program causing it, then I would say that this is a serious problem that needs to be fixed.

White's bad game move loses a ko threat, and will combine with another mistake (move 272) to lose a point when White is ultimately one threat shy of winning the final ko.]
;B[rn];W[jr];B[cb];W[dc];B[ma];W[es];B[na];W[lb];B[ca];W[fr];B[la];W[ka]
;B[da];W[ea];B[hr];W[kf];B[eo];W[co];B[cd];W[fb];B[os];W[kr];B[af];W[de]
;B[eg];W[al];B[ej];W[ak];B[lh];W[ce];B[mf];W[mi];B[be];W[ke];B[ge];W[oo]
;B[fs];W[gs];B[hs];W[js];B[fs]
C[Black can win this ko, but will lose the final ko, to win by 0.75 stones , or half a point with Japanese rules.]
(;W[qi]
C[White's move here was a final mistake that lost a ko threat and allowed Black to win the final ko.  This did not change the result, and with Chinese rules, the margin did not change either.]
;B[rh];W[gs];B[fg];W[gg];B[fs];W[sf];B[se]LB[er:A][he:B][gs:C]
C[White will eventually run out of ko threats and fill at A, after which Black will be able to fill both kos at B and C.  B+0.75 stones (B+1.5 pts)]
)
(;W[rg];B[se];W[gs];B[ia];W[ha];B[fs];W[lo];B[mo];W[gs];B[hb];W[ga];B[fs]
;W[rh];B[sg];W[gs];B[md];W[ib];B[fs];W[qi];B[sh];W[gs];B[kh];W[jg];B[fs]
;W[so];B[sp];W[gs];B[fg];W[gg];B[fs];W[er];B[he];W[gs];B[ai];W[aj];B[fs]
;W[jm];B[jo];W[gs];B[ji];W[ii];B[fs];W[jk];B[jl];W[gs];B[jb];W[ja];B[fs]
;W[rh];B[rg];W[gs];B[hp];W[fs]
C[Black wins by 0.75 stones or 0.5 points with Japanese rules.]))
(;B[js]
C[If Black takes the stone, White will live with sente.]VW[ak:ss];W[ks];B[hs]
;W[es]))
(;W[jr]VW[an:ss];B[is]LB[ks:A]
C[If White covers on the 2nd line, Black's sagari is sente, threatening A next.]
))
(;W[nn]
C[I took a look at the idea of White finishing the ko now.];B[ag];W[aj];B[ec]
;W[eb];B[kc];W[kb];B[ac];W[ab];B[ad];W[cb];B[ji];W[jh];B[ii];W[ij];B[jj]
;W[ih];B[er];W[dr];B[ir]
C[Black wins, by the smallest margin.]))
(;W[eg]
C[When White pushes through here, allowing White to connect in the center would be a failure for Black.]
(;B[fg];W[ff];B[fe];W[ge];B[gg];W[ee];B[he];W[fe];B[pm]TR[fg]
C[Black should cover (marked) to cut off White's group in the center.  White can capture Black's group on the left, but then Black attacks here, and White's group in the center is in trouble.]
;W[lg];B[ml];W[jh];B[hh];W[mm];B[ai];W[bh];B[ml];W[kf];B[ke]TR[lg][ai]
C[White makes an eye (marked), and the center group's life depends on a ko.  Starting with the marked hane, Black has a good number of ko threats on the left.]
;W[mm];B[co];W[bo];B[ml];W[ng];B[oh];W[mm];B[ej];W[al];B[ml];W[rg];B[se]
;W[mm];B[am];W[an];B[ml];W[rh];B[sg];W[mm];B[ag];W[ak];B[ml];W[qi];B[sh]
;W[mm];B[ah];W[aj];B[ml]LB[kr:A]
C[Black wins.  White has run out of ko threats, and Black didn't even use the threats at A.]
)
(;B[ge];W[fg];B[fe];W[ec]LB[eg:A][bj:B]TR[ge]
C[Black's marked move can save the group on the left, but that would allow White to connect to the center.  White would not need to make eyes in the center, and would not need to add moves to capture the 4 stones at C, so White is gaining a lot.  This is bad for Black.]
)))
(;B[mr]VW[ak:ss];W[hr];B[hp];W[fr]TR[hr][mr]
C[If Black attacks (marked), White has the marked forcing move to connect to the corner.]
))
(;W[kk];B[ej];W[di];B[bm];W[bk];B[dm];W[cg];B[pf]TR[kk][bm]
C[If White plays at A in the center (marked), Black will play to reduce White's left side (marked), which is a big move that will reduce White's corner, as well as gaining points on the side.]
))
(;B[oe]VW[aa:sk];W[od]TR[oe]
C[If Black responds (marked), White will play here, looking at the cut on the 3rd line.]
(;B[ne];W[qd];B[qe];W[pc];B[pe];W[rc]TR[ne]
C[If Black pushes out (marked), White can make trouble in the corner.];B[mb]
;W[mc];B[lb];W[kb];B[ka];W[jb];B[se];W[pb];B[rb];W[sb];B[sc];W[sd]TR[mb]
C[Black extends liberties (marked), and finally throws in to get a ko in the corner.  This is dangerous for Black.]
)
(;B[pc];W[ne];B[pe];W[gf];B[ff];W[if]TR[pc]
C[If Black simply connects (marked), White will play the atari and continue with the sequence to here, making some potential for White in the center.]
)
(;B[pe];W[mb];B[pc];W[gf]TR[mb][pe]
C[If Black connects (marked), White can force, gaining points on the upper side.]
)))
(;W[gi]
C[If White attacks, ...]VW[aa:km];B[bc];W[bb];B[cd];W[dc];B[ab];W[ba];B[gg]
;W[fe];B[eg]TR[bc]
C[... Black can play the big marked move, and will have no trouble settling the upper left group.]
))
(;B[bc]
C[If Black plays away, ...]VW[aa:sk];W[qe];B[qd];W[qf];B[qg];W[rg];B[pe]
;W[sf];B[qh];W[rh]TR[qe]
C[...White can reduce Black's territory starting with the marked play.]))
(;W[gk]VW[aa:ks];B[gj];W[fj];B[gi];W[fk];B[ej];W[di];B[fi]TR[ej][gk]
C[If White tries to escape (marked), Black can use the marked forcing move to capture White.]
))
(;B[dm]
C[Connecting is not good.]VW[aa:ks];W[dg];B[df];W[cc];B[di];W[dj]TR[ep:fp]
C[White will continue with this fight on the left side.  Black's marked group is not fully alive yet, so this is troublesome for Black.]
))
(;W[dg]
C[White should have peeped from above.]VW[aa:ks];B[df];W[ek];B[dk];W[ej]
;B[ck];W[di]LB[gn:A][cc:B]
C[Next, White can attack with a move at A or B.]))
(;B[bn]
C[Black wants to play this hane on the second line, but my analysis shows that Black could not.

Must White cover or can White extend?]
VW[aa:ks]
(;W[bo];B[dn];W[co];B[dj]TR[bo]
C[White's covering (marked) makes it easy for Black.  Black has good shape on the left side.]
)
(;W[dn];B[bo];W[co];B[dm];W[en]TR[dn][bo]
C[When White extends (marked), Black is happy to force (marked), but then gets into trouble when White pushes through here on the 5th line.]
(;B[fm];W[fn];B[gm];W[go]TR[fm]
C[If Black pulls back (marked), White can push through and capture the side here.  This is good for White.]
)
(;B[fn];W[fm];B[gm];W[fl];B[go];W[dk];B[bk];W[fr];B[gr];W[fs]TR[fm:fn]
C[If Black covers, White will cut (marked) and then live in the corner, making miai of the left and lower sides.]
(;B[ci];W[hq];B[hp];W[gq];B[gp];W[df]TR[ci]
C[If Black protects the left (marked), White can take profit on the lower side with sente.  Black still has a low position on the left, and this is good for White.]
)
(;B[hq];W[cj];B[bj];W[ch]TR[hq]
C[If Black protects (marked), Black will be forced into a painfully low position on the left.  This is good for White.]
)))))
(;B[qe]
C[If Black tries to capture without giving up any territory, the corner will have some bad aji.]
VW[ia:sk];W[rd];B[ra];W[qg];B[qf]LB[rg:A][nd:B][nf:C]
C[White's group in the corner is dead, but White can make use of it with forcing moves from outside.  White A is forcing, and if White later plays B and C, Black will eventually be forced to put stones inside the territory to capture White.]
))
(;W[jn]
C[I would have pulled back here.  Will Black try to cut or back off?]VW[aj:ss]
(;B[kp];W[jp];B[jo];W[ko];B[lp];W[lo];B[mp];W[go]TR[kp]
C[If Black jumps out (marked), White can sacrifice the side group.  White's tesuji here will squeeze Black to make good shape on the outside.]
;B[hp];W[gp];B[hq];W[gq];B[hr];W[gr];B[jr];W[dl];B[gm];W[fr]
C[ White's potential to attack in the center is more valuable than Black's territory on the side, and this favors White.]
)
(;B[ko];W[jo];B[jp];W[kp];B[lp];W[kq];B[go];W[mp]TR[ko]
C[If Black jumps out (marked), White can push through to cut, and White already has a living shape on the side.  White will have an advantage as this develops into a fight in the center.]
)
(;B[go];W[ko]TR[go]
C[If Black protects (marked), White will also reinforce.  Compared to the game, White has a more solid connection.]
)))
(;W[jp];B[iq];W[io];B[ir]LB[ko:A]TR[ip:jp]
C[If White pushes, Black will cover (marked) and extend down here.  This settles Black's group, while taking away White's base.  Next Black can attack at A.]
VW[ai:ss]))
(;B[pk]VW[ia:ss];W[ok];B[oj];W[pl];B[ql];W[qm];B[pi];W[nj];B[oi];W[nr]TR[pk]
C[If Black pushes through (marked), White will sacrifice one stone to make shape on the outside.  White's final move here puts pressure on Black's group in the corner.  This is not bad for White.]
))
(;B[cd]VW[aa:js];W[cc];B[bc];W[ce];B[bd];W[de]TR[bc][cd]
C[AlphaGo often plays this attachment and hane.]
(;B[be];W[cb];B[df];W[ch]TR[be]
C[After Black connects underneath (marked) and pushes up, White will immediately attack here to start a fight.]
;B[dl];W[bg];B[bf];W[dj]
C[Black has two unsettled groups on the left side of the board, and I like this for White.]
)
(;B[dc];W[cb];B[db];W[bb];B[ab];W[be];B[ca];W[dl]TR[dc]
C[If Black cuts (marked) to take the corner, White will end with sente and start surrounding the left side here, while also threatening to attack Black on the lower side.  This is good for White.]
)))
(;B[cf]VW[aa:sl];W[rf];B[rd];W[qi]
C[If Black plays away, White can erase the right side with this sequence.]
))
(;B[nd]VW[ha:ss];W[re]
C[When Black hanes on top, White can slide here to live in the corner.];B[rf]
;W[qe];B[qf];W[ob];B[nb];W[pb];B[mc];W[pl];B[pk];W[pp];B[qq];W[nl]
C[White will take sente to continue on the right side, and White has a lead in territory.]
)
(;B[nb]VW[ha:sk];W[rf];B[rg];W[qg];B[re];W[rh]LB[mb:A]
C[This local sequence was played in game 2, though the board position was very different.  Later, White can play at A to force from the side or make trouble in the corner.]
))
(;B[jp]
C[AlphaGo rarely plays this joseki move.]VW[ag:ss];W[qk]TR[np]
C[In this case, it is easy for a human player to agree with AlphaGo as Black playing away in the game.

White extends on the right here, and Black seems to have too many stones on the lower side.  When Black already has the marked stone, it seems feasible to play away and invite White into the lower side to start a fight.]
))

