(;GM[1]FF[4]SZ[19]AP[SmartGo:3.1.3]CA[UTF-8]
GN[Game_009_Zen]
PW[AlphaGo Zero]
PB[AlphaGo Master]
KM[7.5]
RE[W+R]ZT[60];B[pd];W[dp];B[dc];W[pp];B[df];W[qc];B[pc];W[qd];B[qf];W[qe]
;B[pe];W[rf]
(;B[jd]
C[When Black has the big shimari in the UL corner and a wall on the right, I want to expand the area in which Black can fight by playing a kakari (see var).]
;W[cn]
C[White's low shimari reduces the value of the left side by making a solid position. This tends to limit Black's moyo to the upper side, thus reducing the value of Black's big shimari and the wall on the right. ]
(;B[dm]
C[Black's shoulder hit is a characteristic move of the Master version, and has becomea popular move with human pros also. Finishing the joseki in the upper right was another option (see var. ]
(;W[ch]
C[The joseki in the upper lrft is not finished, but White does not have a strong attack at this time (see var). ]
;B[qq];W[pq];B[qp];W[po];B[rn];W[iq]
(;B[cm]
C[While Master likes to cover here, I want to play from above to expand Black's moyo (see var). ]
;W[dn];B[em];W[dd]
C[White's attachment is a move that AGZero likes, and this showed up in a similar position in game 5 of this set, and in my analysis I tried to explain how it works. ]
(;B[ed]
C[With this hane, it is not good for Black to play a hane underneath. ];W[cd]
;B[cc];W[bc]
(;B[de]
C[Bumping against White, Master differed from the sequence played in game 5 (see var). ]
;W[bd];B[fc];W[cg];B[eh];W[cj];B[di];W[bk];B[hp]
C[This shoulder hit and the following sequence with which Black dominates the center is characteristic of the Master version. ]
;W[ip];B[dq]
C[Black's attachment is a probe that will leave aji in the corner or will create some forcing moves from above, depending on how White reacts. ]
(;W[ep]
C[Instead of covering to take the corner (see var), White plays solidly to prevent Black forcing from above. ]
;B[io];W[ho];B[hn];W[go];B[gn];W[gp];B[jo]TR[ep][dq]
C[Black has given White the whole side, but because of the well-timed marked exchange, there is some aji in the corner. ]
;W[im];B[in];W[kh]
C[While White has a lot of territory, it is still necessary for White to invade the center. White A is perfectly placed in a position that makes it difficult for Black to choose to attack or to defend. ]
LB[kh:A]
(;B[kj]TR[cm:em][gn:in]
C[By playing from the center, Black is attacking White. This move also reinforces the marked group, which could become eyeless if it gets cut off.  The variation shows Black's other option, that is to surround the upper side. ]
;W[jf]
(;B[qb]
C[With this hane, Black's choice of joseki in the UR corner creates a lot of bad aji in Black's shape, which is bad news when your opponent is AGZero. I suggest a more straightforward sequence to surround the upper side. ]
;W[rb];B[rg]
C[Playing the hane at A first, and then this double hane is a common joseki with which Black can start to build on the right side. I don't like it in this case, because the right side seems relatively small when compared to the upper side. ]
LB[qb:A];W[pf];B[qg];W[pb];B[ob];W[qa];B[of]LB[nb:A][pg:B]
C[This joseki variation in the UR corner is maybe the most popular among human pros after AlphaGo. Black gets to play on both sides, and captures a White ston in a ladder to create thickness. The tradeoff is that White can clamp at A to reduce the upper side, or can play a ladder breaking move for the ladder at B. In this board position, Black's added potential on the right side does not seem adequate to make up for that loss. ]
;W[ii];B[ig]
C[Black A is the vital point to destroy White's shape. ]LB[ig:A];W[mi]LB[mi:A][pg:B]
C[White A breaks the ladder at B. ]
(;B[ni]
C[One of the more reliable Go proverbs says that you should not play an attachment move against your opponents weak stones, so this move is very counter-intuitive when Black is supposed to be attacking White, but the more natural looking move that I would play without hesitation doesn't seem to turn out so well either (see var). ]
;W[nh];B[li]
(;W[oi]
C[White switches to the right, which is just about forced. Covering in the center would be bad (see var). ]
(;B[nj];W[pg];B[og];W[ph];B[oh];W[pi];B[mh];W[rh]
C[After White A, this trade was forced. Black has surrounded the center on a large scale. If Black can make this a territory, it will be enough for Black to win. The problem is, Black has bad aji all over.]
LB[pg:A];B[cf]LB[cf:A]
C[AG seems to love suprising me with the timing of these moves. That said, Black A is actually a move that Black wants to play at some point, as Black will continue with a probing cut after White connects underneath. ]
;W[bf];B[nc]LB[nd:A][ng:B][kd:C]
C[Black 81 is an important move that is fixing some of the aji with White moves at A, B, or C. ]
;W[jj]
C[White seems to be attempting to make eyes in the center. ]
(;B[ki]
C[Attempting to make eyes was actually a fairly realistic plan for White (see var), and Black 83 is necessary to prevent that. ]
;W[mb]LB[oa:A][jc:B][ng:C]
C[The direct threat with White 84 is the ko at A, but this also links up with the attachment at B and ultimately the escape at C, all of which is extremely annoying for Black. ]
(;B[mc]
C[Covering from above seems to be a reasonable move, and Black will have enough territory if it can surround the whole center. Just for fun, I attempted to show what might happen if Black blocks from the right (see var). ]
;W[jc]
C[There is still a great deal of aji associated with the White stones in the center, so White is trying to create some forcing move from above to enable it to save the center group. ]
;B[kd]TR[jf][kh][ii][jj]
C[Master plays solidly, as Black must capture the marked White stoes to stay in the game. ]
;W[kc];B[id];W[lc]
C[AGZero is extremely persistent in trying to get the most out of the bad aji here. ]
(;B[hb]
C[Black 91 prevents White from playing the same point, which would give White a living shape on the side. For the variation, I tried blocking on the right in an attempt to kill White. ]
;W[ng];B[ne];W[fk]
C[With this troublesome move, White still has some potential to reduce Black's territory in the center. ]
;B[cp]
C[Black makes use of the aji in this corner. ];W[cq];B[bq];W[cr];B[bo];W[br]
TR[em][gn:in]LB[cp:A][bn:B]
C[With the exchange starting with Black A, Black has created a potential connection at B, which reinforces the marked group. ]
;B[ek];W[ej];B[bg]LB[cf:A]
C[Black's cut is a probe, and continues from the move at A that was played earlier. ]
(;W[bh]
C[White potentially loses some points by taking from this side, but if White connects on the other side (see var), Black gets a forcing move from above. ]
(;B[fj]
C[Instead of pushing through (see var), Black cuts to reduce White's eyespace in the center. ]
;W[ic];B[hc];W[fi];B[gj];W[gi];B[ei];W[dj];B[hj];W[hi];B[gk]
C[Black has succeeded in cutting White's group in the center off, and White has no eyespace. ]
;W[eg]LB[ee:A][ld:B][mg:C][he:D]TR[eh:ei][di]
C[White attaches, attacking the marked Black stones while aiming at the cut at A, and also preparing White B, which will set up White C or the peep at D. ]
(;B[fh]
C[Black backs out, avoiding the more dangerous fight shown in the variation. ]
;W[ld];B[mg];W[fg];B[gh];W[oa]
C[After gaining some potential profit with the marked exchange, White finally challenges Black to a ko in the upper right. ]
TR[eg:fg][fh:gh]
(;B[dg]
C[Since white had some ko threats in the center (see var), Black avoided the ko and played the biggest move while allowing White to connect on the upper side. ]
;W[dh];B[gg];W[nb];B[be];W[ag];B[jp]
C[Black 129 is a big move that erases White's potential on the lower side. ]
;W[fl];B[gl];W[en];B[fn];W[le]
C[White 134 is a big move that threatens to connect up with White's stones in the center. ]
;B[eo];W[do];B[bn]
C[Black 137 is a big move that is worth about 20 points. ];W[mn]TR[po:pq]
C[White 138 reduces the center while reinforcing the marked White group. ]
;B[pr];W[or];B[qr];W[nq];B[jq];W[ir];B[pm];W[lm];B[on];W[no];B[mr];W[mq]
;B[lr];W[nm];B[sf];W[sh];B[pl];W[kn];B[kl];W[lq];B[nr];W[ll];B[re];W[sg]
;B[kk];W[mf];B[nf];W[ko]
C[White is alive. ];B[ml];W[km];B[lo];W[lp]
(;B[jr]
C[With Black 171 it was better for Black to capture 5 Whitestones in the center, but Black was behind anyway (see var). ]
;W[jh]
(;B[mo]
C[Black 173 makes a seki. The variation shows what might happen if BLack tries to cut White in the center. ]
;W[oo]
(;B[oq]
C[With 175 Black continues to make a seki. the variation shows another attempt for Black to try to cut White in the center. ]
;W[op];B[mp];W[kp];B[gr];W[gq];B[bb];W[ce];B[ff];W[ab];B[is];W[fr]
(;B[ih];W[jl];B[jk];W[if];B[ar];W[dr];B[nl];W[ji];B[nn];W[mm];B[qj];W[ke]
;B[rd];W[qh];B[rf];W[rc];B[lf];W[kf];B[il];W[jm];B[hs];W[hq];B[ba];W[ib]
;B[he];W[ha];B[ga];W[ia];B[ac];W[ae];B[fo];W[fp];B[dk];W[gb];B[gc];W[fa]
;B[ck];W[bj];B[bl];W[qn];B[rm];W[eb];B[ec];W[db];B[cb];W[hr];B[jg];W[kg]
;B[fb];W[rk];B[rj];W[sj];B[qk];W[ga];B[sk];W[sl];B[gs];W[oq]
C[Black finally resigns. White is ahead before komi. ])
(;B[kf];W[ke];B[lg];W[if];B[he];W[je];B[ih];W[jg];B[ji];W[jl];B[jk];W[ik]
;B[ij];W[aq]))
(;B[ih];W[hh];B[hg];W[ji];B[kf];W[ke];B[lg];W[jg];B[je];W[hd];B[ie];W[if]
;B[he];W[hf]LB[ih:A][kf:B]
C[If Black starts with A and the uses the tesuji at B to cut, White is going to capture one of the two marked groups with this sequence. ]
TR[he][gg]))
(;B[kf];W[ke];B[lg];W[jg];B[je];W[hd];B[ie];W[he];B[if];W[hg];B[hf];W[gf]
;B[hh];W[ih]
C[Black A is a tesuji with which Black would usually be able to cut White in the center, but as this var shows, it doesn't work in this case. ]
LB[kf:A]))
(;B[jg];W[kg];B[jh];W[jl];B[jk];W[ik];B[ij];W[qk]LB[jg:A][qk:B]
C[Black can capture the center with A, but White has a small lead after taking the big point at B. ]
))
(;B[na];W[nb];B[pa];W[gg];B[hh];W[oa]LB[na:A][gg:B]
C[Black cannot win the ko at A, because White has some ko threats in the center starting with B.
]
))
(;B[dg];W[ld];B[mg];W[fg];B[dh];W[he]LB[dg:A][ld:B][he:C][hd:D][ee:E]
C[If Black pushes through at A, White B is forcing, and then White C threatens both D and E. 
]
;B[gf];W[mf];B[lf];W[lg];B[nf];W[hf]LB[gf:A][ee:B][hf:C]
C[Black A prevents the cut at B, and the White C revives that threat. ];B[gg]
;W[le];B[hd];W[hg];B[me];W[ke]LB[hd:A]TR[ig]
C[White connects with sente and finally captures the marked stone to make a second eye in the center. White has an eye on the upper side already. ]
))
(;B[dj];W[dk];B[el];W[fi];B[fh];W[gh];B[gg];W[gl];B[en];W[jl]LB[dj:A][fi:B][gl:C][jl:D]
C[If Black pushes through at A, White can force with B and C and then make some living space with D. This is a failure for Black. ]
))
(;W[be];B[ci];W[bi];B[bh];W[ah];B[dj]TR[cg:ch]
C[If White connects at A, Black can reduce the liberties of the two marked stones with this sequence, and this makes a difference in the fight in the center. ]
LB[be:A]))
(;B[nb];W[ld];B[ic];W[ib];B[hb];W[kb];B[la];W[ma];B[ia];W[ja]LB[nb:A][ld:B][ng:C]
C[If Black blocks at A, White B creates a lot af aji at C. White has only one eye on the upper side. ]
;B[jb];W[ng];B[nf];W[ib];B[ha];W[mg];B[lh];W[lf];B[md];W[le];B[od];W[jh]
LB[ng:A][od:B]
C[After White escapes at A, Black is made busy to live up to B. The fight continues in the center. ]
;B[jk];W[ik];B[jl];W[fi];B[dj];W[fh];B[if];W[fk]
C[White has an eye on the upper side, and what looks like another in the center. It is difficult for Black to continue the attack. ]
))
(;B[nb];W[kd];B[jc];W[fi];B[dj];W[dk];B[ek];W[fh];B[eg];W[fk];B[el];W[jh]
;B[if];W[je];B[ie];W[lf]LB[fi:A][ng:B]
C[If Black blocks, White will just save everything, using A as a forcing move this time. The marked exchange is making a difference when White threatens to escape at B next. White has some eyespace in the center, and this looks difficult for Black. ]
TR[mb:nb]))
(;B[jk];W[ik];B[jl];W[ki];B[lj];W[gj];B[dj];W[dk];B[ek];W[fk];B[ej];W[gh]
LB[jk:A][gh:B]
C[If Black plays from the outside with A, White has forcing moves right and left, and after White B it will be difficult for Black to continue the attack. ]
))
(;B[lh];W[pg];B[lf];W[og];B[nf];W[qi];B[nc]))
(;W[lh];B[mj];W[mh];B[oi]TR[pf]
C[If White covers at A, Black gets to close White in, efficiently capturing the marked White stone while attacking. This is bad for White. ]
LB[lh:A]))
(;B[lh];W[pg];B[li];W[ph];B[qi];W[pi];B[qj];W[nf];B[lf];W[nd]
C[If Black cuts White at A, White will escape from the ladder with B. The following trade seems to be about even, but when Black still has to worry about White C or D in the center, I do not feel confident for Black in the overall position. ]
LB[lh:A][pg:B][ek:C][km:D]))
(;B[le];W[lf];B[mf];W[mg];B[lg];W[lh];B[kf];W[kg];B[ng];W[lf];B[ke];W[nh]
;B[lg];W[mh];B[rg];W[qg];B[pf];W[rh];B[pg];W[sg];B[qh];W[qi];B[rg];W[pb]
;B[ob];W[qg];B[ph];W[mk]LB[le:A][rg:B][mk:C][lk:D]
C[I suggest that Black should have played at A to surround the upper side. After White makes shape in the center, Black plays the double hane at B, and this is a choice of joseki that will give Black a strong shape towards the center. White leaves the ko on the right to take the important point at C. Maybe I would continue with Black D now, leaning on White to get some space in the center and to slide into the lower side. This looks close, and I like it better than the way Black played. ]
))
(;B[kf];W[mh];B[li];W[lh];B[mf];W[qg];B[pf];W[qb];B[pb];W[pa];B[oa];W[qa]
;B[nb];W[jj]LB[kf:A][qb:B][jj:C]
C[If Black surrounds the upper side with A, White will be able to play the big move at B with sente. White finally plays the important point at C, and most of Black's potential in the center is gone. This could actually be a close game, but it feels bad for Black. ]
))
(;W[cq];B[ep];W[eq];B[dr];W[er];B[fp];W[cr];B[do];W[cp];B[io];W[jo];B[jn]
;W[ko];B[kn];W[ln];B[lm];W[in];B[ho];W[mn];B[kl]LB[cq:A][ep:B][jn:C]
C[If White covers at A, Black can hane at B to create some forcing moves when White takes two stones in the corner. Black continues with C to create thickness in the center, and this is good for Black.]
))
(;B[fc];W[be]
C[This is the variation played in game 5 of this set, and this is an even result. ]
))
(;B[cd];W[ce];B[de];W[ed];B[cc];W[cf];B[dg];W[cg];B[fb];W[ei];B[ff];W[ck]
LB[cd:A]TR[cm:em]
C[While Black's hane at A looks like a natural shape, it does not work well for Black in this board position. White sacrifices two stones and cut off the marked Black group to attack. ]
))
(;B[eh];W[dj];B[ej];W[dk];B[ek];W[dl];B[el];W[cm];B[jp];W[ip];B[jn]LB[eh:A][jn:B]
C[I want to cap at A to expand the upper side moyo. If White takes territory on the left, Black can continue to B and dominate the center. This is good for Black. ]
))
(;W[pf];B[qg];W[rg];B[qh];W[of];B[qb];W[rb];B[ob];W[qa];B[oh]LB[pf:A][jd:B]
C[If White cuts at A, Black can fight strongly here. When Black has the supporting stone at B, this fight is good for Black. ]
))
(;B[qg];W[rg];B[qh]LB[qh:A]
C[By extending to A Black creates a thick shape and expands the upper side moyo into the center. Master never played this way in this game set, but it was a feasible option. ]
))
(;B[cn];W[fq];B[jd]LB[cn:A]
C[When Black plays a kakari at A before extending on the upper side, This expands Black area of influence and invites White to a fight on the left side. Black's big shimari and the moyo on the upper side make such a fight advantageous for Black, and I like this better than the game. ]
))

