(;GM[1]FF[4]SZ[19]AP[SmartGo:3.1.4]CA[shift_jis]
GN[27]
PW[AlphaGo]
PB[AlphaGo]
EV[AlphaGo selfplay]RO[27]
KM[7.5]
RE[W+R]
RU[Chinese]MU[1]MU[0]MU[0];B[pd];W[dd];B[pp];W[cp];B[eq]LB[do:A]
C[AlphaGo likes Black's next local move at A, and seems to avoid this with White in most cases, as we will see in this game. More than 300 years ago, Honinbo Dosaku, who was one of the greatest players in Go history, liked to press at A, but in modern Go it had become less popular. Maybe we reasoned that Dosaku was so strong that he could win even if Black A wasn't a good move, but in any case, after AG the human asessment has changed to give Black A a high value. ]
;W[dn]LB[do:A]
C[White answers directly, preventing Black from pressing at A. ];B[cc];W[dc]
;B[cd];W[cf];B[ce];W[de];B[bf];W[nq];B[qn]
(;W[qc]LB[cb:A][nc:B]
C[In game 36 of this series, White played the hane at A, and in game 19, the kakari at B. See var for some of the game 36 moves.]
;B[pc];W[qd];B[qf];W[qe];B[pe];W[rf];B[cg];W[df];B[cb];W[qg];B[pf];W[qb]
LB[id:A]
C[Mirror Go is a term used when White plays moves that are diagonally opposite to the previous Black moves to create a position with rotational symmetry, so it does not quite describe what is happening on the upper side in this game. That said, the left and right sides do seem to mirror each other in this position. Black has the tempo to play an important move on the upper side, so it is clear that Black has an advantage, but the question is, will it be enough to pay komi? I would suggest A for Black's next move. ]
;B[gc]LB[id:A][db:B][hc:C]
C[As mentioned at move 28, I would have played at A with this move. I would reason that with the side open at B, Black does not need to get so close because White will have trouble making enough space for eyes in any case. That being my original reaction to Black 29, I have tried to learn from this move, and indeed it is not easy to make a strong argument to say that this is bad for Black. I stubbornly resist changing too much, but maybe I could go as far as to play at C. ]
(;W[hd]
C[A shoulder hit by AG. This is a very active move, which is a suprise when White is one move behind in the local fight. If White had played away with this move, say the extension-pincer on the lower side, Black would have attacked strongly in the upper left (see var). ]
;B[gd];W[he]
(;B[ff]
C[Compared to pushing on the fifth line (see var). Black is more sure of getting out into the center with a connected shape with Black 33. ]
;W[hc];B[gb];W[dg];B[ch];W[dh];B[kc]
C[Already this fight on the upper side is exciting, with three Black and three White groups. This is a dangerous fight for White, and relatively safe for Black because of the potential to connect at A or B. ]
LB[eb:A][ib:B];W[hg];B[gg];W[hh];B[di]
(;W[ei]
C[White's hane at 44 is definitely the 'fighting spirit' move, while White could have escaped with a jump (see var). ]
;B[eh]
(;W[fi]
C[One must consider extending in the different direction (see var). ];B[ge]
LB[eh:A]
C[Black 47 has the effect of saving Black's cutting stone at A. ];W[ci];B[dj]
;W[gh]
(;B[eg]
C[Black fills a White liberty. Black would like to be able to play at A with this move, but that changes the status of the semeai (see var). ]
LB[fh:A];W[bi];B[bh];W[ck];B[dk];W[cl];B[fk];W[ld]
C[Another shoulder hit!]
(;B[lc]
C[ It looks like Black can connect up, but that's not how it turned out (see var). ]
;W[nc]LB[ld:A]
C[The combination of White A with this invasion is not intuitive, but in this case it is an effective way for White to cut Black off. ]
(;B[kd]
C[Black simply curls, instead of the more aggressive hane (see var). Now there will be four groups each, jostling shoulders on the upper side, and it looks crowded. ]
;W[le];B[jf];W[lg];B[ke];W[mc];B[jh]
C[Maybe this is a good time to take a look at how all these groups are faring. A is alive of course, and B is dead. C is winning the semeai with B even if White covers on the second line. Black must be careful of D because they are the stones that cut B off and White will have options to chase them around a bit. E is weak, but White should be able to handle it by leaning on D. Black F is not settled, but will be ok since it can always connect to the left on the second line. White G has a cutting point but also can connect to the right on the second line, so it's ok. Black H is in danger, and White I is alive. So what does that all add up to? Black has more territory with a big area in the upper left, but the weak group at H balances that to make the outcome undecided. ]
LB[cd:A][dd:B][gd:C][dj:D][hh:E][ke:F][mc:G][pd:H][qd:I];W[gk]
(;B[em]
C[Black dodges to the side, as the hane is bad (see var). ];W[lf]LB[md:A][jg:B]
C[White 70 removes the threat of a cut at A while looking at some aji at B. ]
(;B[jg]
C[Black would like to be able to play on the right, but 71 is necessarry to remove a serious threat (see var). ]
;W[je]
(;B[ib]
C[Black does not want to mess with the White stone (see var), so jumping at 73 connects on the side while preventing a cut on the sixth line, two birds with one stone. ]
;W[oh]
C[White captures Black in the upper right. The two dead groups are about the same size, while White has some extra territory on the left. Black will have to catch up on the lower side. ]
;B[en];W[hl];B[dm];W[cm];B[do];W[cn];B[oj]
(;W[qi]
C[See var for What can happen if White plays away from the right side. ]
;B[mh]
C[Black creates some aji for the dead (?) Black group. ];W[lh];B[mj];W[ki]
;B[ii]
(;W[ek]
C[White 88 is so simple a tactic, but even a strong player might miss this (see var). ]
;B[dl]
C[Even if Black plays at A White will be able to play away, so connecting here is better shape. ]
LB[ej:A];W[fl]
C[White captures the one stone to make some eyeshape. ];B[rg];W[rh];B[pg]
(;W[ph]
C[Connecting would give Black the option to pull out the Black group (see var). ]
;B[qh]
(;W[ah]
C[Is this really a ko? See the var.];B[bg];W[qg];B[hn];W[qk]
C[There were two reasons for why it was ok for White to allow the ko. One is that White had plenty of ko threats, and the second is that White A settles the ko, and is a big move that White could have played anyway (probably a bit later in the game), so White is not really losing a whole move when it settles the ko. ]
LB[qk:A]
(;B[oq]LB[hn:A][oq:B]
C[Black gets two big moves at A and B while White was busy finishing the ko. Black's group in thr UR has lost most of it's potential to cause trouble (see var). ]
;W[kk];B[ng];W[nh];B[qh];W[sg];B[mg]
(;W[og]
C[White would like to go for the whole Black group, so lets look at it in a var.]
(;B[np]
C[The UR is not a ko (see var). ];W[km];B[im];W[il];B[jm];W[fp];B[eo];W[dq]
LB[fp:A][dq:B]
C[The combination of A and B creates some aji for White inside Black's moyo. ]
;B[li]
C[Black squeezes out a bit more potential before it sacs the stones anyway. ]
(;W[ni];B[jl];W[jk];B[mi];W[of];B[kl];W[lk];B[ll];W[mk]LB[li:A][kh:B]
C[By forcing with A before saccing the group, Black created a cut at B that will give Black a small profit (1pt) close to the end of the game. ]
;B[fr];W[nm];B[pl]
C[Black threatens to connect at A. ]LB[nj:A];W[ml]LB[nj:A][pk:B]
C[White can now counter Black A with White B. ];B[mn];W[hq]
(;B[gp]
C[Black defends weaknesses in Black's connection (see var).];W[lq]
(;B[nr]
C[Black 135 is a good aji move that stops White from setting up a ko (see var). ]
;W[gq];B[dr];W[jp];B[cq]
C[Black is getting compensation while it looks like White will live on the side. ]
;W[go];B[co];W[bo];B[bp];W[ap];B[bq];W[an];B[ip]
(;W[io]
C[White plays the strongest move. White cannot afford to answer from below (see var). ]
;B[jq];W[kp];B[iq];W[ho];B[om];W[ql];B[qm];W[on];B[ok];W[nj];B[lr]TR[ip:iq][jq]
C[Black had a number of ways to save the marked stones, but is trying to get some territory in the process. This will cause a ko. ]
;W[kr];B[kq];W[mr];B[lp]
(;W[ls]
C[White could not connect on the third line (see var). ];B[mq]
(;W[lo]
C[This will be a ko anyway (see var), so White plays the atari from above. ]
;B[lr];W[hb];B[ha];W[lq];B[qg];W[ri];B[lr];W[ic];B[ko];W[jo];B[lq]
(;W[gn]
C[When Black offered a trade, White had to save the lower side group (see var). ]
;B[jc];W[mo];B[nn];W[no];B[oo];W[ln]
C[White captures the marked Black stones in the center. ]TR[jl:ll][im:jm][hn]
;B[hp]TR[gq:hq]
C[Black captures the trwo marked White stones. ];W[fo];B[fq];W[mm];B[aq]
LB[pn:A]
C[Black 189 looks wrong, as White will not play here anyway. The game is very close in any case, but I say that Black A is the correct move. ]
;W[if];B[ai];W[bl];B[kf];W[mb];B[rm];W[po];B[qo];W[op];B[bn];W[bm];B[ao]
LB[ak:A]
C[Locally, White can play at A to live here. That is not so fun for White, so it plays the ko instead. ]
;W[gf];B[hf];W[qp];B[pq];W[gf];B[fg];W[ap];B[hf];W[ao]LB[ig:A][hf:B][fe:C]
C[Black would like to be able to fight a ko by cutting at A, but after White wins the ko and connects at B, there is a cut at C. Because of this Black cannot fight this ko. ]
;B[re];W[sf];B[rl];W[rk];B[gf];W[ig];B[lb];W[ji];B[ih];W[oo];B[pj];W[nk]
;B[pk];W[sk];B[aj];W[bj];B[ag];W[ep];B[cj];W[bk];B[dp];W[sl];B[sm];W[ij]
;B[hi];W[rp];B[ro];W[fj];B[ma];W[na];B[la];W[rr];B[qr];W[rq];B[hj];W[rs]
;B[sr];W[mp];B[qj];W[rj];B[pm];W[pi];B[nq];W[hk];B[fm];W[gm];B[kh];W[ak]
;B[ej];W[el];B[gj];W[ie];B[jd];W[be];B[bd];W[ah];B[ai];W[ae];B[ad];W[aj]
;B[af];W[ah];B[md];W[nd];B[ai];W[jb];B[ia];W[ah];B[fh];W[gi];B[ai];W[ga]
;B[fa];W[ah];B[me];W[mf]
(;B[ai]
C[If we were counting by the Japanese rules, this would be a position in which Black's best move would be to protect at K19, using only one stone inside Black's territory. The result would be a half point win for White.  ]
;W[ja];B[ga];W[ah]
C[White will win this ko. The game will end with White winning by 1/4 of a stone with Chinese rules, or 1and a half points with Japanese rules. ]
)
(;B[ja];W[ai]
C[W+0.25 stones (0.5pts)]))
(;W[jb];B[gn];W[nn];B[ia];W[ja];B[ga];W[jc];B[hf];W[if];B[gf];W[ig];B[mo]
C[Black is ahead by more than 10 points before komi. ]))
(;W[lr];B[lo];W[jo];B[jr];W[js];B[is];W[hp];B[ks]LB[lo:A]
C[In this var, Black gets to force with A before starting a ko on the side. Black A gives Black a connected shape in the center, making the ko safer for Black when compared to the game sequence. ]
))
(;W[mq];B[mp];W[ls];B[jo];W[ko];B[jn]TR[ko:kp][jp]
C[The marked stones have been captured. ]))
(;W[iq];B[kp];W[jq];B[om];W[ql];B[qm];W[on];B[ok];W[nj];B[nn]
C[Black has expanded the LR corner, and in this variation Black has gained enough profit from the attack on White in the lower side for Black to have a lead in territory. ]
))
(;B[jq];W[mp];B[no];W[or];B[pr];W[mr];B[os];W[ns];B[nr];W[be];B[bd];W[or]
C[White has a ko to live on the side. ]))
(;B[jq];W[jp];B[kq];W[gn];B[go];W[ho];B[gm];W[gp]LB[fo:A][ep:B]
C[With threats of White A or B, this is very annoying for Black. ]))
(;W[fq];B[qg];W[rj];B[of];W[pi];B[ne]))
(;B[qg];W[rj];B[nf];W[of];B[oe];W[ne]
C[White captures Black. ]))
(;W[mi];B[ni];W[li];B[qg];W[pi];B[ri];W[rj];B[sh];W[re];B[ne];W[og];B[of]
;W[nf];B[mf];W[me];B[nf];W[pl];B[sf];W[od];B[pb];W[oc];B[qa];W[ra];B[pa]
;W[sb];B[mb]LB[mi:A][qh:B][mb:C]
C[White wants to capture the whole group with A, but Black captures at B, and if White tries to avoid another ko, it gets very troublesome. In this variation, Black finally escapes at C, a complete failure for White. ]
))
(;B[qh];W[sg];B[qg];W[rj];B[ng];W[og];B[nf];W[of];B[oe];W[nh];B[mg];W[ne]
C[White can capture Black. ]))
(;W[sg];B[qg];W[rj];B[pi];W[ng];B[re];W[sf];B[qj];W[ri];B[sh];W[si];B[se]
;W[qk];B[pj];W[rl];B[sh];W[pb];B[sk];W[rk];B[pl]
C[Not good for White. ]))
(;W[qh];B[ng];W[og];B[nf];W[of];B[ne];W[oe];B[nd];W[od];B[oc];W[ph];B[md]
;W[lb];B[kb];W[mb];B[li]
C[Black doesn't quite save the group on the right, but can use White's weakness at A to cut off White's stones in the center, a huge profit for Black. ]
LB[ph:A]))
(;W[fj];B[hn];W[ek];B[dl]
C[The difference between this and the game is that White has not captured the stone at A yet. ]
LB[fk:A]))
(;W[ho];B[rg];W[qh];B[rh];W[re];B[qi];W[pi];B[qj];W[nh];B[hq]LB[rg:A][pg:B]
C[Black cuts at A to threaten pushing through at B. The result is that Black gets profit on the side while reducing White's territory. ]
))
(;B[ie];W[if]LB[if:A][id:B]
C[White exchanges one stone each before connecting at A. This is better than immediately playing at A, as White can capture at B with sente later. ]
))
(;B[oh];W[li];B[qh];W[pg];B[og];W[rg];B[oj];W[hb];B[jj];W[ef];B[fg];W[jg]
;B[ig];W[hf];B[kg];W[fe];B[fd];W[eb];B[db];W[gf];B[ee];W[ec];B[ea];W[fa]
;B[da];W[fh];B[fe];W[ga];B[fb];W[ha]LB[hb:A][jg:B][hf:C]
C[Black's moves on the right are a good way for Black to handle the weak group, but there is a problem on the left. White covers at A, and then can use the wedge at B to get a stone at C. These two stones at A and C combine to fill just enough of Black's liberties to get a seki in the upper left. ]
))
(;B[gl];W[fl];B[fm];W[el];B[dl];W[em];B[dm];W[en];B[cm];W[ah];B[bg];W[be]
;B[bd];W[bm];B[bn];W[bl];B[cn];W[co];B[an];W[cj];B[db];W[ek];B[ec];W[bo]
;B[ed];W[ag];B[ae];W[am];B[ee]LB[gl:A][an:B][ak:C]
C[If Black plays at A, White can cut, and the White group on the left is more resilient than one might expect. If Black tries for a semeai with White's left side, White will win. Black's best choice is to play at B and then fill liberties on the upper side. White can squeeze and finally live by playing at C, with a strong center and this is a good result for White. ]
))
(;B[md];W[nd];B[ne];W[me];B[mc];W[ob]
C[The cut at A is very effective in that it creates two weak Black groups and gives White attacking potential. ]
LB[me:A]))
(;B[kd];W[le];B[mb];W[ke]LB[mb:A][ke:B]
C[Black can connect with the slide at A, but this is painful for Black when White plays the thick move at B and Black still has a weak shape. ]
))
(;B[fh];W[bi];B[bh];W[ck];B[dk];W[cl];B[fk];W[gj];B[em];W[hb];B[md];W[eb]
;B[db];W[ec]LB[fh:A][eg:B][gi:C][hb:D]
C[At first, Black A might seem superior to playing at B in that it creates a cutting point at C. However, when White covers at D this creates a threat within what looked like Black's territory. Black A now becomes a bad move that has filled one of Black's liberties while not filling White's. The upper side will end in a seki, obviously good for White. ]
))
(;W[ej];B[dj];W[eg];B[fh];W[fg];B[gh];W[gf];B[gi];W[ek];B[dk];W[gk];B[hj]
;W[fe]LB[dk:A][ci:B][hj:C]
C[Black A is a key move in this var that prevents a White cut at C. The reader is invited to check that White playing the net at C does not quite work. White is not under pressure in this fight, and not liking to sac seven stones, I would have played this way for White]
))
(;W[fh];B[ei];W[fg];B[cl];W[hq]LB[fh:A][cl:B][hq:C]
C[White could have escaped with A, although it is not a strong move. B and C are both large points. The game is about even at this point. ]
))
(;B[ge];W[gf];B[hf];W[gg];B[if];W[hc];B[hb];W[ib];B[gb];W[jd];B[eb];W[md]
LB[ge:A][gf:B]
C[If Black pushes at A, White will cover at B, and the fight heats up. In the shown variation, White haas a good position on the upper side, and this favors White. ]
))
(;W[iq];B[gf];W[eh];B[ch];W[gh];B[ig]
C[White A is an important opening point. Black can attack strongly in the upper left, making a large structure on the upper side. This looks about even to me, and I suggest it as an alternative way to play. ]
LB[iq:A]))
(;W[cb];B[bb];W[bg];B[db];W[eb];B[cg];W[df];B[bh];W[dg];B[ag];W[qc]LB[db:A]
C[Game 36 of this self played set. Cutting once at A and then capturing a White stone on the left side is considered to be a slight disadvantage for Black locally, but can be played when the left side is considered important. ]
))

