(;GM[1]FF[4]SZ[19]AP[SmartGo:3.1.4]CA[shift_jis]
GN[28]
PW[AlphaGo]
PB[AlphaGo]
EV[AlphaGo selfplay]RO[28]
KM[7.5]
RE[B+R]
RU[Chinese]MU[1]MU[0]MU[0];B[pd];W[dd];B[qp];W[dp];B[np];W[qc]
(;B[qd]
C[Black covering on the 'wrong' side is also possible, with the use of a modern joseki (see var). ]
;W[pc];B[nc];W[oc];B[od];W[nb];B[pj]LB[mc:A]
C[Instead of continuing with the joseki sequence at A, Black takes a central point on the right. This works well with the board position and is a logical move. ]
;W[fq]LB[lq:A]
C[With 14, White has taken away the best move for Black on the lower side. While this is a tight move that takes territory in the corner, it also controls the side to an extent. White's next move on the lower side can be at A. ]
;B[cc]LB[gp:A]
C[In this set of self-played games that were released in May 2017, AG likes to dive into the 3-3 but also can play at A. In the Master vs Zero set of games, released 2017/10, Master (this version) always played at A. ]
;W[cd];B[dc];W[ec];B[eb];W[fb];B[fc];W[ed];B[gb];W[db];B[fa];W[cb]
C[The joseki in the upper left is usually considered a slight advantage for Black, but in this case the upper side is relatively small, which decreases the value of Black's ponnuki. I would call this an even board position. ]
;B[gp];W[hr]
(;B[cn]
C[Black 29 does not seem to be consistent with the plan that I would have with Black's previous move, but since the left side is also big, I guess it's ok. I would want to build on the moyo (see var). ]
;W[mc];B[nd];W[rc]LB[mc:A][rc:B]
C[The combination of White A and B is always a big move that gives White a large territory and weakens the Black wall. ]
;B[iq];W[ql]LB[qq:A][qh:B]
C[When White invades at 34, White might just try to live with this stone, but also can use attacks at A or B to make a trade of some kind. ]
(;B[qn]
C[Black reinforces the corner. Black's other option was to kick from the side (see var). ]
;W[hq]
(;B[hp]
C[I would have jumped to the fifth line with Black, in which case White's plan was to reduce the lower side and then make a small life in the corner or lower side (see var). ]
;W[ip];B[jq];W[io];B[hn]
(;W[qq]
C[White does not have an immediate attack against Black on the lower side (see var), so finds a roundabout way, starting with a probe in the corner. ]
;B[pq];W[kp];B[kq]
(;W[in]
C[Covering on the 3thd line was bad (see var), so White pushes at 46, threatening to push through at the marked point. ]
TR[ho]
(;B[eo]
C[Black 47 reinforces Black's stones on the left while preparing an attack against White in the corner. The shape move was an extension in the center, but then White pushes Black around (see var). ]
;W[lq];B[lr];W[oq];B[pp];W[mq]
(;B[eq]
C[Black switches to an attack in the corner. As White has two ways to answer this move, there is some meaning for Black to ask for White's response before crawling on the side (see var). ]
(;W[ep]
C[With 54, White's alternative was the hane underneath (see var). ];B[fp]
;W[fr];B[dq];W[cp];B[cq];W[bq];B[br];W[bp];B[er]
(;W[ir]
C[The Black corner group might end up in a semeai with one of the two White groups. Otherwise, we might have a semeai between two groups on the lower side first. There are various kos that could happen in the corner too. I will attempt to clarify by showing one var at a time, starting with White trying to capture the corner without ko (see var). ]
(;B[mr]
C[Now Black crawls, when I want to say it's too late! If Black just covers on the second line we get the corner ko that doesn't happen (not yet anyway, and see var). ]
(;W[jp]
C[White 66 is a vital point that reduces Black's liberties. If White had connected on the third line, Black would have been able to improve the corner group next (see var). ]
(;B[nq]
C[Black simply sacs the cutting stones, but will have an advantage in the corner semeai. If Black tries to save three stones, White will have an advantage in the semeai (see var). ]
(;W[kr]
C[This was actually a chance for White to kill the corner, but capturing the cutting stones is more important (see var). ]
;B[do]
(;W[cr]
C[White cannot win the semeai, so makes a ko (see var). ];B[cs];W[ar]
(;B[dr]
C[Black cannot avoid a ko in the corner (see var). ];W[qh]
C[Just as it becomes obvious that White can get a ko, the value of this move decreases dramatically, and White plays away. One reason is that this is a two stage ko in which White must play three moves, A, B, and C, to win. Another reason is that even if Black plays first, it will be a ko anyway, so White can afford to wait. If Black uses a tempo to play at D White can start the ko, in which case Black's play at D will become an inefficient move after the ko is resolved. ]
LB[bs:A][cr:B][ds:C][bo:D]
(;B[rj]
C[The variation shows how connecting at A will not finish off the White group. Since it will be a ko anyway, the LL corner is not worthy of a move at this time. That said, when this ko does start, the prize will be a difference of more than 35 points, so it is a big event that will probably happpen late in the game. ]
LB[bs:A];W[oh];B[mh]
C[The fighting switches to the right side. Black is on top, while White has a potential connection at A, so both sides are relatively safe as they head into the center. ]
LB[re:A];W[ni];B[nk];W[mk];B[ml];W[mj];B[pg];W[ph];B[kh];W[lc];B[le];W[nf]
;B[mf];W[nl];B[ok];W[nr];B[or];W[fn]LB[nf:A][mf:B][re:C]
C[After exchanging A for Black B, White had secured a connection on the side with C, which is now miai with escaping in the center. Having reinforced the group on the right, White is free to switch to the left side. ]
;B[gn];W[cl];B[mm]
C[Black completes the right side, taking a lead in territory. ];W[fl];B[hl]
;W[ge]
C[White hopes to expand the left side, with two potentially weak Black groups in the upper right and lower left. Black will try to interfere with a threatened attack on the right side. There is still a ko in the LL corner waiting for the right time to happen.]
;B[bm]LB[bm:A][bs:B]
C[After playing at A, Black will have the option to capture White by playing at B. ]
;W[bl];B[ej]
(;W[cm]
C[White plays a forcing move at 104 to fix the connection (see var). ];B[bo]
LB[cm:A][bo:B][bs:C]
C[The exchange of White A for Black B does not change the fact that White can get a ko by playing at C. ]
;W[gk];B[kj];W[gi]
C[So far, White is taking the left side and seems oblivious to the danger on the right.]
(;B[rf]
C[Black must attack from the side (see var). ];W[rg]
C[White can still save the group with a play at A. ]LB[re:A];B[hj];W[gj]
(;B[hg]
C[Black passed by an opportunity to capture the right side, probably because it's not good enough (see var). ]
(;W[kk]
C[Black tries one more forcing move, and this time White doesn't like the trade (see var). ]
;B[fg];W[jj];B[ji];W[am];B[bn];W[lj];B[ki]
(;W[hh]
C[White is trying to weaken Black's shape. White 122 is a point that can give Black good shape while fighting in the center (see var). ]
;B[dg]
C[Black just jumps in at A. After this move, Black has a temporary but significant advantage in territory, and White must find a way to attack or use the ko in the LL corner to catch up. ]
LB[dg:A]
(;W[di]
C[White cannot surround Black from the center (see var). ];B[em]LB[el:A][fo:B]
C[If White answers at A, Black has erased the threat of a cut at B. ];W[ef]
;B[fe];W[fd];B[ei];W[el];B[eg]LB[hf:A][gf:B]
C[White A is met with Black B. ];W[en];B[fo];W[ng];B[bc];W[bb];B[ne];W[ig]
C[Suddenly the direction of White's attack switches to the right side. ]
;B[hf];W[mg];B[lg];W[kf];B[lf];W[if];B[he];W[jd];B[gd];W[jk];B[kd];W[jc]
;B[qg];W[ri];B[qk]LB[nh:A]
C[With 153, Black sets up to play at A next, capturing three White stones. ]
;W[pl];B[ol];W[bs];B[sg];W[rh];B[fm]
C[Black calmly captures two stones to make a living shape, and the ko is not yet resolved. ]
;W[oj];B[of]
(;W[gl]
C[While White 162 takes away one of Black's eyes, the defensive meaning for this move might be more important. White's left and right side groups were not yet completely safe (see var). ]
;B[as];W[pk];B[rl];W[bs];B[kc];W[kb];B[as]LB[re:A][lb:B][me:C][ih:D][je:E]
C[White can reduce Black to one eye on the right with a play at A, but Black can cut at B to create a second eye, or cut at D in combination with E for an eye in the center. How this works will be demonstrated by the game sequence. ]
;W[qj];B[qi];W[bs];B[ll];W[pi];B[qj];W[lk];B[as];W[hc];B[gc];W[bs];B[dk]
;W[dl];B[as];W[sj];B[rk];W[bs];B[gq];W[gr];B[as];W[om];B[nm];W[bs];B[ij]
(;W[hk];B[as]
(;W[nj]
C[White 196 was just slightly smaller than any of White's previous ko threats. The var shows how White could have played to continue the ko. ]
;B[aq];W[nl]
C[This finishes the fighting and enters the endgame, in which I doubt that AG will make any game changing mistakes. In the early middle game Black was taking a significant lead in territory. while White finally got some back by playing the ko and capturing at A with its ko threat. It is going to be a half point difference, as always. ]
LB[nl:A];B[lp];W[jr];B[qm];W[re];B[qe];W[rd];B[ih]
C[Black can makean eye by playing at A next. ]LB[jg:A];W[je];B[lb];W[ib]
;B[jg];W[kg];B[md];W[mb];B[ld]LB[ih:A][lb:B]
C[This game sequence demonstrates how Black could use the cuts at A and B to make an eye in the center. ]
;W[bd];B[cg];W[bf];B[ci];W[mp];B[no];W[cj];B[dj];W[bi];B[ch];W[bj];B[ee]
;W[on];B[mo];W[de];B[ff];W[lo];B[bg];W[oo];B[op];W[hb];B[cf];W[af];B[ck]
;W[bk];B[hm];W[ik];B[gh];W[hi];B[ii];W[fh];B[eh];W[rm];B[rn];W[ls];B[ns]
;W[gg];B[df];W[gm];B[dn];W[be];B[kn];W[ln];B[km];W[ha];B[fs];W[gs];B[es]
;W[sk];B[sm];W[si];B[ah];W[ks];B[ms];W[hd];B[ie];W[jf];B[gf];W[ga];B[an]
;W[al];B[ho];W[sl];B[rm];W[se];B[sf];W[po];B[qo];W[ai];B[gh];W[li];B[lh]
;W[gg];B[id];W[nh];B[gh];W[qf];B[pf];W[gg];B[ic];W[ko];B[gh];W[da];B[ge]
;W[gg];B[jn];W[im];B[gh];W[kl];B[lm];W[gg];B[ke];W[jh];B[gh];W[fi];B[gg]
;W[jb];B[jg];W[os];B[ps];W[jh];B[il]
(;W[dm];B[jg]
C[White can win the ko at A, but wasn't wanting ti fill it. If there were a small number of dames to fill and a sufficient surplus of ko threats for White, White could have concievably filled all the dame while winning the ko, which can make a difference with Chinese rules, but is not going to happen in this game. Black wins by 1.5 points, or 3/4 of a stone in Chinese rules. ]
LB[jh:A])
(;W[jg]
C[B+0.75 (0.5)]))
(;W[qf];B[qe];W[bs]LB[re:A][bd:B][ik:C]
C[White has more ko threats with A, threatening to kill the Black group. If Black ends up playing point losing ko threats such as B or C, White will gain some extra points. The result was not clear if White had played this way. ]
))
(;W[cr];B[il];W[rp]))
(;W[cr];B[gl];W[ek]
(;B[dj];W[ds];B[ij];W[ih];B[ll];W[lk];B[jm];W[km];B[im];W[kl];B[lp];W[jr]
;B[kn];W[ln];B[lo];W[pk];B[rl];W[nm];B[om];W[nn];B[mp]LB[gl:A][dj:B][ij:C]
C[The combination of A and B gives Black strong shapes on both sides and gains territory. More important is that it prepares a deadly double attack at C. In this variation, White's group on the right will die. ]
)
(;B[br])))
(;W[hf];B[bc];W[bb];B[fe];W[fd];B[gf];W[he];B[ig]LB[hf:A][fe:B]
C[White A is a strong try to enclose Black, but it fails after Black B. ]
))
(;W[hc];B[eh];W[di];B[ei];W[hk];B[ik];W[jk];B[ij];W[il];B[hh];W[fo];B[co]
;W[bs];B[as];W[gh];B[gg];W[bs];B[im];W[jl];B[as];W[hi];B[ii];W[bs];B[jm]
;W[km];B[as];W[jn];B[hm];W[bs];B[ll];W[lk];B[as]LB[eh:A][hh:B][em:C]
C[In this fight, Black is pressuring the White group on the left, and getting good shape at B while thety cut in the center. Black ha an advantage in the number of ko threats, and can disrupt White's shape with a peep at C. ]
))
(;W[gg];B[hh];W[gh];B[qf];W[kk];B[lk];W[lj];B[ll];W[ki];B[jj];W[ji];B[ii]
;W[jh];B[li];W[kg];B[lh];W[jf];B[ng];W[ik];B[ij];W[hf];B[ic];W[hk];B[jk]
LB[hg:A][bs:B][il:C]
C[This is another trade of right for left. When compared with the variation for Black 113, Black A has slightly reduced White's territory on the left, and after the ko at B, Black still has the option to save the group by playing at C. ]
))
(;B[qf];W[kk];B[lk];W[lj];B[ll];W[ki];B[jj];W[ji];B[li];W[ij];B[jk];W[jh]
;B[ng];W[am];B[bn];W[bs]
C[While Black can kill the White group, White's territory on the left is fairly big, and now the ko is looking good for White too, with some ko threats on the right. If White wins the ko, White will then threaten to cut off the entire Black group by pushing through at A. ]
LB[ik:A]))
(;B[kl];W[qi];B[qj];W[re]
C[White can connect on the side. ]))
(;W[gk];B[el];W[em];B[dl];W[dm];B[cm];W[cj]LB[el:A]
C[Black can cut White with the sequence from A. While this is not a problem at all for White in this board position, it could concievably become a problem later. ]
))
(;B[bs];W[bn];B[bm];W[co];B[dm];W[ao];B[am];W[an];B[aq];W[cl];B[cm];W[es]
C[If Black tries to capture without a ko, White can get a seki. Playing at A and then getting this seki is a complete failure for Black.]
LB[bs:A]))
(;B[bs];W[es];B[dr];W[fs];B[ds];W[aq]
C[When Black connects at A in an attempt to avoid ko, White wins the semeai.]
LB[bs:A]))
(;W[ds];B[cr];W[ar];B[bo];W[bs];B[co];W[aq];B[ao];W[es];B[ap]
C[Black wins the semeai. ]))
(;W[ds];B[cr];W[ar];B[jr];W[js];B[kr];W[es];B[hm]LB[ds:A][jr:B][hm:C][do:D]
C[Finally the placement at A works! White wins the semeai without a ko, but the result is good for Black. Black gets to save the cutting stones with B and extend at C, attacking White in the center. Black's stones in the corner have three liberties, so after filling a dame at D, Black can squeeze from the side.  ]
))
(;B[jr];W[js];B[kr];W[ds];B[cr];W[nq];B[gq];W[gr];B[is];W[es];B[ks];W[ar]
;B[hs];W[fs];B[cs];W[bs];B[as];W[aq]
C[The atari at A made a one move difference in this semeai. This is another ko, but White takes first, and Black is dead on the side, so this is good for White. ]
LB[js:A]))
(;W[nq];B[gq];W[gr];B[fs];W[cr];B[cs];W[ar];B[bs];W[es];B[ds];W[gs];B[jr]
;W[es];B[dr];W[aq];B[is]
C[In this var, Black A improves the corner while filling a White liberty. White manages to get a ko anyway, but this ko favors Black because Black will capture first, and White's groups on the outside are both weak. ]
LB[fs:A]))
(;B[jr];W[cr];B[cs];W[ar];B[dr];W[dn];B[is];W[ho];B[gn];W[il]LB[jr:A][cr:B][bs:C][ds:D]
C[After Black A, the semeai without a ko favors Black, similar to the var for White 64. Cutting at B is White's tesuji to create a ko in the corner. From here on, White will threaten to squeeze from the center. After the fight in the center settles down, White will choose a time to start a ko at C. Note that Black can fill liberties to capture White on the side without fighting this ko, but in that case White will get profit in the corner with captures up to D being sente. If White's group on the left gets into trouble, White can use this ko to save it by making eyes in the corner. To sum that all up, White's group on the lower side will be captured, but White has potential to force from the center or corner that more than compensates for it, and White has a small advantage. ]
))
(;W[ds];B[cr];W[ar];B[gq];W[gr];B[es];W[ir];B[jr];W[ks];B[mr]LB[ds:A][ar:B][es:C][fs:D]
C[White A is a tesuji that often works in this shape. B and C are both vital points. Black's side group can crawl to extend liberties, and White is lost. At some point in the semeai White must cover at D, so Black has 4 liberties while White has only 3. ]
))
(;W[er];B[gq];W[gr];B[fp];W[fr];B[dq];W[dr];B[cq];W[mr];B[qi]
C[This is similar to the var for Black A (53), but better for Black because Black has not increased the damage by crawling at B. Black has an advantage now. ]
LB[eq:A][mr:B]))
(;B[mr];W[nq];B[eq];W[er];B[gq];W[gr];B[fp];W[fr];B[dq];W[dr];B[cq];W[nr]
LB[mr:A][er:B][nr:C]
C[If Black starts by srawling at A, White will just sac the corner with B, and finally capture the Black group with C. Black A has become a bad move played from within White's territory (mochikomi), and the machine analysis with Zen gives White a small advantage.]
))
(;B[hm];W[lq];B[lr];W[oq];B[pp];W[mq];B[mr];W[nq];B[jp];W[jo];B[ko];W[lp]
;B[kn];W[im];B[il];W[jm];B[nr];W[or];B[kr];W[mn]LB[kr:A][mn:B][ir:C]
C[The whole fight here is difficult for Black. Black A is a vital point that extends Black's liberties to 6, a temporary 1 liberty advantage against White's group on the right. If Black had played elswhere with A, White could have cut at A to squeeze and reduce Black to 3 liberties. After White B, the most direct continuation will lead to White getting 6 liberties with tempo to kill Black by playing at C.]
))
(;W[lq];B[lp];W[in];B[jp];W[ko];B[jo];W[jn];B[kn];W[lo];B[ln];W[mo];B[mp]
LB[lq:A][in:B]
C[If White starts at A, the lower side heats up, and Black will no longer answer White B on the left. This is bad for White. ]
))
(;W[kp];B[kq];W[lq];B[lp];W[ko];B[lr];W[mq];B[mr];W[mp];B[nq];W[mo];B[en]
LB[lq:A][mr:B]
C[White A is not much of a success, when White cannot continue pushing through after Black B. ]
))
(;B[io];W[ip];B[jo];W[jp];B[ko];W[qq];B[pq];W[rp];B[rq];W[qo];B[qr];W[rn]
;B[po];W[rj]
C[This var demonstrates White's plan. With the probe at A, White can either live in the corner or use forcing moves to live on the side as shown. ]
LB[qq:A]))
(;B[qk];W[qq];B[pp];W[ok];B[pl];W[hq];B[io];W[ip];B[jo];W[jp];B[ko];W[ni]
LB[qk:A][qq:B]
C[If Black kicks at A, White can probe at B, threatening a cross-cut. With some profit on the lower side and a potential life in the corner, White can afford to sacrifice a stone on the right side. ]
))
(;B[iq];W[hq];B[io];W[hp];B[ho];W[ip];B[jo];W[kq];B[lp]LB[iq:A][io:B]
C[Playing at A and then B is the usual shape her. This var shows Black's plan to build up the moyo. ]
))
(;B[pc];W[qd];B[qf];W[qe];B[pe];W[rf];B[qb];W[rb];B[re];W[pb];B[rc];W[qa]
;B[rd];W[qb];B[rg];W[pf];B[qg];W[nc];B[nf]
C[This joseki has become popular after pros started studying with computer programs. Black's final move at A is to be played when the ladder at B does not work. ]
LB[nf:A][of:B]))

