(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Chinese]SZ[19]KM[7.50]
PW[AlphaGo]PB[AlphaGo]DT[2019-11-22]EV[AlphaGo selfplay]RO[34]PC[The KGS Go Server at http://www.gokgs.com/]RE[B+Resign]MU[1]
;B[pd]
;W[dc]
;B[cp]
;W[pp]
;B[ce]
;W[eq]
(;B[qq]C[When learning with an AI I see a high value attached to pressing on the fifth line, that is in the UL corner in this board position (see var). ]
;W[pq]
;B[qp]
;W[qn]
(;B[qo]
;W[po]
;B[rn]
(;W[fd]C[Again, AG allows an opportunity to press on the fifth line to pass by (see var). The play by both Black and White in this opening does not seem to match with the opening patterns shown in the Master series against human players. I find that AG seems to have a good deal of freedom for variety of play in this set of self played games, while it seems more limited in the other sets of games. While this variety leaves me with some unanswered questions, it also makes these games attractive study material. ]
;B[qm]
;W[pn]
;B[qr]
(;W[qc]C[Once more, AG fails to press on the fifth line (see var). ]
;B[qd]
;W[pc]
(;B[od]C[Black extends on the fourth line, a solid move that has gained popularity recently. The most common move would have been a keima on the third line, and the choice between these two joseki variants should depend on the board position (see var). ]
(;W[oc]C[White had a choice here, the most common move being a keima on the second line (see var). ]
;B[nd]
;W[nc]
;B[pm]
;W[md]LB[md:B][pm:A]C[By crawling twice in the upper right, White got some compensation after Black took the important point at A, by playing te hane at B, which is also a big point. White was making miai of the two points.]
;B[me]
;W[le]
;B[mf]
(;W[lq]C[It is said that one should play a hane on top of two stones, but in this case that would just help Black consolidate the right side (see var). ]
(;B[nm]
;W[ld]
;B[jq]
;W[do]
;B[co]
;W[dn]
;B[cm]
;W[ko]
(;B[jo]C[Black could have just lived on the side, but instead chose to make some extra space by attaching here (see var).]
(;W[jp]C[White's wedge is not really an attacking move, as White is trying to reinforce the White group on the right. The var shows the normal shape, an extension towards the center. ]
(;B[kp]C[Cutting here was a sharp counter to White's wedge. Covering on the left would have allowed White to make good shape while moving out into the center (see var). ]
;W[ip]
;B[lo]
(;W[kq]C[White had no choice but to allow the ponnuki (see var). ]
;B[kn]TR[nm][jq]
;W[qg]LB[of:A][rl:B]C[White could not postpone this invasion any longer. This stone is not as weak as it might seem, because Black must be careful of the eyeless wall in the upper right. White has a vital point at A to play, and also the peep at B with potential to make a life on the side. ]
(;B[re]TR[of]C[While the immediate fight is on the right, Black has various aji to look forward to on the lower side. The var shows Black's strongest threat, which was not played because Black actually needs a good supply of ko threats to make it work. ]
;W[pi]SQ[rl]
;B[rc]LB[lb:B][kc:A]TR[rc][re]C[With the two marked moves Black has made a living shape for the Black group, which will increase the options for a strong attack against White on the right later. Black has also weakened White's position on the upper side, and will soon be able to attack weak points at A or B.]
;W[io]LB[nq:B][jr:A]C[White adds a stone to the lower side, reducing, but not completely removing, the threats of Black A or B. ]
;B[nh]LB[ni:A]C[With this strangely cautious move, I cannot explain why Black does not simply play at A. ]
;W[rl]
;B[rm]
;W[ni]
;B[mi]
;W[nj]
(;B[nq]TR[ol]
;W[mp]
;B[oh]
;W[qk]
;B[np]LB[ol:A]C[Black might seem to be randomly switching back and forth on the lower and right sides, but these two attacks are actually related. White will need to play a peep at A to be comfortably alive on the right, and Black is preparing to make optimal use of that fact. ]
;W[mo]
;B[ph]
(;W[ol]C[White finally must play this peep. The var shows what might have happened if White had simply answered on the side. ]
;B[on]LB[on:A][np:B][nq:C]TR[om]C[Black A works with the previously played B and C to capture five White stones. ]
;W[qh]
;B[rj]LB[ol:A]C[Black 67 is still the vital point, but with a stone at A, White's position will not collapse. ]
;W[rk]
(;B[sh]TR[ol]C[The variation shows how the marked White stone works to save the White group. ]
;W[rh]
;B[mj]
;W[mk]
;B[dm]
;W[cd]
;B[bd]
;W[bc]
(;B[gp]LB[jq:A]C[Black 77 hits a vital point to make use of the stone at A.]
(;W[fo]
;B[lk]
(;W[ml]TR[lk]C[With 79 (marked), Black was threatening a strong attack on the right (see var). ]
;B[go]
(;W[em]
;B[fn]
(;W[hq]C[This is a strange sequence with White sacrificing the stone at 82 that it just played, but White just doesn't seem to have any good options. The var shows White connecting on the left. ]
;B[en]
;W[gq]TR[em][en]
(;B[kc]TR[rc][re]C[Black has a favorable position after successfully attacking White on the lower side. With 87 Black can erase White's moyo on the upper side. The var shows Black peeping on the second line, which doesn't quite work. ]
(;W[id]
;B[ic]
;W[hc]
;B[jd]
(;W[je]C[Covering here on the fifth line is the natural shape, while White playing an atari on the second line is not good in this case (see var). ]
;B[hb]
;W[hd]
(;B[lc]C[While Black 95 might seem to be a vulgar move, it is necessary to exchange this for a White connection on the right before extending on the second line (see var).]
;W[mc]
;B[gb]C[Black is alive on the upper side. ]
;W[om]
;B[nn]
;W[mn]
;B[mm]
;W[no]
;B[oo]
;W[lm]
;B[op]
;W[ll]TR[kn][jo][lo][kp]
;B[ln]TR[jq]
;W[mq]
;B[nr]
;W[jm]LB[jr:A]TR[kr][lr][mr]C[Black has temporarily lost five stones in the center, but can squeeze from below by playing at A and then the marked points. However, it is not good for Black to immediately play that exchange, because Black has some aji in the center.]
(;B[oi]LB[mh:C][oj:A][pj:B]C[Black pushed through at 111, asking if White answers at A or B? Black is trying to reinfirce the weakness at C with sente. ]
(;W[pj]C[What if White had covered? See var.]
;B[oj]LB[nk:B][ok:A]C[If White now answers at A, Black can capture at B with sente, strengthening Black's shape in the center. ]
;W[fb]
;B[gc]
;W[gd]
;B[fc]
;W[eb]
(;B[mb]
;W[nb]
;B[ma]LB[jb:A]C[With Black, I might have taken the easy way by living with Black A instead of Black 119-121. That is because the Black group is not (locally) alive when White plays at A. I might say that AlphaGo likes to make it difficult, but actually White will get into trouble if it attempts to kill Black's group. ]
(;W[ci]C[We need a diagram to show what might happen if White tries to kill Black on the upper side (see var). ]
(;B[km]LB[oj:A]C[White has played away after the threatening Black move at A, so now Black can break out in the center. ]
;W[kl]
;B[jl]
(;W[ok]C[The var shows what happens if White captures the six Black stones in the center. ]
;B[im]
;W[jk]
;B[jn]
(;W[jr]C[White needed to play at 130, otherwise the lower side would have been a ko (see var). ]
(;B[ik]
;W[eh]
(;B[jf]C[Black's attachment at 133 provides some extra security for the Black group on the upper side that was not completely alive. If White answers locally, this stone will slightly improve Black's potential to chase White's right side group.]
(;W[jj]C[The var shows how Black could have attacked on the right if White had answered 133 directly. ]
;B[nk]
;W[nl]
;B[ij]
;W[ji]
;B[hh]
;W[kg]
;B[ej]LB[jb:B][jf:A]C[Now the game seems to have entered the endgame. With a stone at A, the Black group on the upper side is safe, in that White cannot try to kill it with White B. Black has a slight advantage. ]
;W[ei]
;B[dj]
;W[hl]
;B[il]
;W[fj]
;B[fg]
;W[eg]
;B[fk]
;W[rb]
;B[di]
;W[ch]
;B[sb]
;W[gj]
;B[ii]
;W[ck]
;B[sg]
;W[jg]
;B[ie]
;W[ke]
;B[ig]
;W[si]
;B[jb]LB[jb:A][ec:B]C[Black finally settles the upper side group. Black A prepares to attack at B next, as will be shown immediately in the game sequence. ]
;W[ff]LB[ec:A]C[White 164 was a big move, with the drawback that it didn't prevent Black's attack at A. It seems that White is behind in any case, and 164 gives White some potential to attack in the center, which could have given 164 a high score.]
;B[ec]
;W[ed]
;B[cb]LB[db:A][cc:B]C[A and B are miai. Black has reduced White's territory very much with this move. ]
;W[el]C[White starts to attack by cutting Black in the center. ]
;B[fl]
;W[dl]
;B[cl]
;W[dk]
;B[fm]
;W[bk]
(;B[cc]
;W[dd]
;B[bb]C[Black establishes profit in the UL corner. ]
;W[eo]
;B[cn]
(;W[in]TR[jm]
;B[gk]TR[hl]
;W[cr]
;B[br]
;W[lp]TR[hl][jm][ko]
;B[fi]
;W[gi]
;B[fq]
;W[fr]
;B[fh]
(;W[ek]
;B[gf]LB[bb:A][ef:B]C[While Black A (177) was a big move that established profit for Black in the corner, we can now see that it added value to a Black cut at B, giving Black's group in the center some extra security. Black seemed to be playing away with A, so it is fascinating to see that this move was actually an indirect response to White's attack in the center. ]
(;W[dh]
;B[if]LB[kf:A]C[Black threatens to push through at A. ]
;W[mg]
;B[ef]LB[hg:B][hl:A]C[Black has one eye at A, so the problem is Black's eye at B. Is it real or fake? ]
;W[be]
;B[ac]
;W[df]
;B[dr]LB[dr:A]C[When Black plays the huge move at A (199), there is no doubt that Black has a lead in territory. ]
;W[dq]
;B[cq]
;W[hf]LB[ef:A]C[White 202 is the tesuji that still works even though Black protected with the cut at A!]
;B[he]
;W[gg]
(;B[fe]C[Black 205 actually invites a ko when Black could have lived unconditionally (see var). One reason for Black's playing a ko is that White is short of ko threats, and another reason is that Black can profit from the ko. ]
(;W[ge]C[White refuses the peaceful variation, and forces the ko (see var). ]
(;B[gh]
;W[ff]
;B[lg]
(;W[lh]
;B[gf]
;W[of]
;B[ff]LB[de:A]TR[dr]C[Having won the ko, Black can capture with A next, and this extra value is what made the ko good for Black. ]
(;W[ia]C[The variation shows that White cannot kill Black's group in thr upper right. ]
;B[ib]LB[de:B][nh:A]C[White resigned. White will need to use a tempo to capture Black's group at A, after which Black can capture at B. Black has a lead. ])
(;W[qb]
;B[pf]
(;W[qf]
;B[og]TR[sd][lf][of][nj]C[Black is alive.]
;W[pe]
;B[pg]
;W[qe]
;B[oe]
;W[nf]
;B[ng]
;W[lf]
;B[ne]
;W[nj]
;B[rf]
;W[rg]
;B[sf]
;W[sd]
;B[rd]
;W[sc]
;B[qi])
(;W[ng]
;B[qf])))
(;W[gf]
;B[kf]))
(;B[hg]
;W[gh]
;B[de]
;W[cf]))
(;W[gh]
;B[ge]
(;W[ee]
;B[hg]LB[bf:B][ff:A]C[In this variation White must use a tempo to capture at A, and Black gets the big move at B, so this is not good for White. ])
(;W[hg]
;B[de])))
(;B[hg]
;W[gh]
;B[ge]LB[bf:A]C[While Black could have lived without ko by playing as shown here, this is a painful life with Black giving White profit. White has sente to play the large move at A. ]))
(;W[hf]
;B[ef]
;W[fe]
;B[df]
;W[dh]
;B[hg]
;W[he]
;B[if]
;W[be]
;B[ac]
;W[cf]
;B[kf]
;W[lf]
;B[lg]))
(;W[bq]
;B[cq]
;W[ar]
;B[bs]
;W[cs]
;B[dr]
;W[as]
;B[fp]))
(;W[cr]
;B[br]))
(;B[gk]
;W[cn]
;B[bn]
;W[bm]
;B[ep])
(;B[ep]
;W[cn])
(;B[cn]
;W[eo]
;B[dr]
;W[dq]
;B[cq]))
(;W[ie]
;B[sg]
;W[jj]
;B[lj]
;W[kk]
;B[ij]
;W[ji]
;B[hh]LB[ie:A][jf:C][sg:B]C[If White answers directly at A, then Black can attack White's group on the right with B. Black's stone at C makes it awkward for White to connect up in the center]))
(;B[jj]
;W[sg]))
(;B[sg]
;W[si]
;B[sl]))
(;W[ik]
;B[jr]
;W[kr]
(;B[ks]
;W[ls]
;B[js]
(;W[mr]
;B[ns]
;W[iq]
;B[ms]
;W[ir]
;B[lr]C[Black gets a ko. ])
(;W[ir]
;B[ms]
;W[lr]))
(;B[mr]
;W[ir])))
(;W[in]
;B[nl]
;W[kk]
;B[sg]C[White's group on the right is dead. ]
;W[si]
;B[sl]))
(;B[ec]
;W[ed]
;B[cb]
;W[ib]))
(;W[jb]
;B[jc]
;W[kb]
;B[lb]
(;W[ka]
;B[ib]
;W[ga]
;B[ha]
;W[ja]
;B[dd]
;W[cc]
;B[ed]
;W[ec]
;B[ie]
;W[jf]
;B[fe]
;W[he]
;B[lf]
;W[kf]
;B[if]C[White can kill Black with a five stone nakade, which is a dead shape, but it's important that Black has a lot of liberties. White's position on the outside falls apart, and one of White's groups will lose the race to capture. ])
(;W[ga]
;B[ka]
;W[ja]
;B[ib]))
(;W[if]
;B[jb]
;W[ci]
;B[ec]
;W[ed]
;B[cb]))
(;B[jb]
;W[kd]
;B[mb]
;W[jc]
;B[ib]
;W[nb]
;B[lb]
;W[ka]
;B[ja]))
(;W[oj]
;B[nk]
;W[ok]
;B[nl]
;W[qj]
;B[km]
;W[kl]
;B[jl]
;W[kk]
;B[jk]
;W[kj]
;B[jj]
;W[ki]
;B[im]LB[nk:A][km:B]TR[jr]C[Black can use the cut at A to cut White and enable an escape with B. ]))
(;B[jr]
;W[lp]
(;B[kr]
;W[jn])
(;B[mr]
;W[jn]
;B[lr]
;W[ko]
;B[kr]
;W[km])))
(;B[gb]
;W[jb]
;B[jc]
;W[kb]
;B[lb]
;W[lc]
;B[ib]
;W[mb]LB[gb:A][jb:B]C[If Black had simply extended at A, then White could have peeped at B. This is bad for Black. ])
(;B[jb]
;W[kd]
;B[jc]
;W[gb])
(;B[mb]
(;W[mc]
;B[gb]
;W[jb])
(;W[lb]
;B[lc]
;W[mc]
;B[kb]
;W[ib])))
(;W[ib]
;B[ie]
;W[jc]
;B[hd]
;W[ic]
;B[kd]LB[ib:A]C[While the atari at A is sometimes a good shape, it doesn't work well for White in this case. White's group on the right is not healthy. ]))
(;W[ic]
;B[id]
;W[hc]
;B[jd]))
(;B[lb]
;W[kc]
;B[kb]
;W[ic]
;B[jb]
;W[jc]
;B[ib]
;W[hb]
;B[hc]
;W[hd]
;B[gc]
;W[gb]
;B[mc]
;W[nb]
(;B[qb]
;W[pb]
;B[ra]
;W[mb]LB[lb:A]C[Black A is a good shape that is often the best move, but in this case White can swallow it up. ]
;B[lc]
;W[ia])
(;B[fc]
;W[fb]
;B[ec]
;W[ed]
;B[eb]
;W[db]))
(;B[hc]
;W[jc]TR[cd]))
(;W[en]
;B[iq]TR[en][fn]
;W[hq]
;B[hr]
;W[gq]
;B[hp]
;W[ir]
;B[jr]
;W[in]
;B[oi]
;W[oj]
;B[nk]
;W[ok]
;B[nl]
;W[qj]
;B[gr]
;W[fq]
;B[mn]LB[nk:B][mn:C][iq:A]TR[gm][en][fn]C[Black A is a strong attack that pressures White on the left. The sequence from B shows a way that Black can squeeze White's group on the right. Finally, Black C captures the lower side. ]))
(;W[gn]
;B[hn]
;W[ho]
;B[in]))
(;W[go]
;B[sg]
;W[si]
;B[pj]TR[ol]
;W[oi]
;B[pk]
;W[pl]
;B[qj]
;W[ql]
;B[ri]LB[sf:A][ok:B]C[Black has taken away White's eyes. If White now continues at A, Black can cut White with B and win the semeai. ]
(;W[ok]
;B[rf])
(;W[sf]
;B[sj]
;W[rg]
;B[ok]
;W[nk]
;B[nl]TR[lk])))
(;W[gq]
;B[hq]
;W[hp]
;B[go]
;W[gr]
;B[in]))
(;B[gq]
(;W[go])
(;W[gp]TR[gq][jq][kq][lq])))
(;B[oi]
;W[oj]
;B[pj]
;W[qi]LB[ol:A]C[With a stone at A, White can capture the Black stones to have a living shape. ]))
(;W[qh]
;B[rj]
;W[rk]
;B[oi]
;W[oj]
;B[pj]
;W[qi]
;B[pk]
;W[qj]
;B[rg]LB[qh:A][rj:B]TR[ol]C[If White had covered at A, then B would become a vital point. The White group is dead. ]))
(;B[oh]
;W[qk]))
(;B[jr]
(;W[hq]
;B[mp]
;W[nr]
;B[nq]
(;W[mr]
;B[or]LB[lp:B][hq:C][jr:A]C[Black's strongest play is the sagari at A, which will actually be answered by White B with a ko that Black cannot win (yet), so this depends on Black getting a supply of ko threats. This variation shows White avoiding the ko and answering at C, and Black gets to capture the White stones on the right. ])
(;W[or]
;B[mr]
;W[mq]
;B[lr]
;W[np]
;B[kr]
;W[oq]
;B[lp]
;W[nq]
;B[hr]
;W[iq]
;B[ir]
;W[gr]
(;B[gs]
;W[fr]
;B[ms]
;W[hs]
;B[no]
;W[ks]
;B[on]
;W[fs]
;B[pr]
;W[is]
;B[os]
;W[ns]
;B[oo]
;W[ps]
;B[op])
(;B[fr])
(;B[gq])))
(;W[lp]))
(;B[qi]
;W[of]
;B[nf]
;W[pi]))
(;W[kn]
;B[lp]
;W[kq]
;B[mq]
;W[mr]
;B[nr]
;W[nq]
;B[mp]
;W[lr]
;B[or]
;W[iq]
;B[lm]LB[kn:A]C[If While extends at A, Black can capture White's stones on the right with this sequence. ]))
(;B[ip]
;W[kp]
;B[io]
;W[km]LB[qg:B][iq:A]C[In this variation, White has good shape on the right with White's stones well connected. With the cut at A, White's group on the right is fairly safe, and this will make things easier for White when White later invades at B. ]))
(;W[kn]
;B[gq]
;W[jn]
;B[ho]LB[lp:B][nq:A]C[In this variation, Black has good shape and is close to being alive on the side. Black has potential to move out into the center and attack the two White groups. White's group on the right has weak points at A and B. ]))
(;B[gq]
;W[ip]
;B[iq]
;W[go]LB[gq:A]C[If Black had simply played at A, White would then have surrounded Black as shown. While Black will easily live on the side, White will be able to reinforce the outside White groups, and this var is not good enough for Black.]))
(;B[ld]
;W[mc]
;B[ke]
;W[do]))
(;W[om]
;B[ol]
;W[nl]
;B[nm]
;W[on]
;B[ok]
;W[nk]
;B[nj]
;W[oj]
;B[pl]
;W[mm]
;B[ld]
;W[mc]
;B[mj]
;W[ke]
;B[lg]LB[om:A]C[While White A seemed to be a vital point, the result shown here is that Black gets a big territory on the right. In the actual game we shall find that when not playing at A, White has ideas to invade deeply into the right side. ]))
(;W[nb]
;B[pm]LB[nb:A][pm:B]C[White A is the most common local move, after which Black will take the important point at B. Since B is a good point, maybe White is unsatisfied with this. In the game, we see White playing more forcefully in the upper right.]))
(;B[nc]
;W[oc]
;B[od]
;W[nb]
(;B[pm]
;W[nd]
;B[mc]
;W[mb]
;B[lc]
;W[ne]LB[nc:A][nd:B]TR[fd]C[After AlphaGo, Black A became the most popular joseki variant when White plays an early 3-3 invasion. Compared to the game move, the UR corner is relatively volatile, because if Black plays away, White can start a fight with the cut at B.  In this board position, White's strong position in the UL corner makes this good for White. This is my explanation for why Black did not choose this course of play.])
(;B[mc]
;W[mb]
;B[lc]
;W[ol])))
(;W[do]
;B[co]
;W[dn]
;B[cm]
;W[kp]LB[do:A][kp:B]C[I might expect an AI to show me this sequence, but even in the context of the values we had before AIs became strong, White A is a good move that forces Black to have a low position on the left, and White B is a natural move that reinforces the eyeless wall on the right while building a moyo on the lower side. I like this better than the game move.]))
(;W[do]
;B[co]
;W[dn]
;B[cm]
;W[ed]LB[do:A]C[I think most AIs, and the young pros studying with them, will want White to press at A. Both this and the game move seem viable to me. ])
(;W[qr]
;B[rr]
;W[ro]))
(;B[rn]
;W[rm]
;B[qo]
;W[pn]
;B[po]
;W[oo]
;B[op]))
(;B[ed]
;W[ec]
;B[fd]
;W[gc]
;B[dn]LB[ed:A][dn:B][qq:C]C[Having studied with Leela, I want to press at A, and if White answers as shown, to play B and prevent White from pressing similarly. While the game move at C is also an 'AI' move, it seems premature. ]))
