(;CA[shift_jis]TT[20]C[Meng Tailing is among the top group of Chinese pros, and is active on the internet, participating in making videos about Go (Chinese language). 
Starting with a relatively familiar looking opening, AlphaGo changes gears mid-joseki to pull ahead in territory. 

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AP[MultiGo:4.4.4]TC[3]DT[2016-12-29]PB[Magist]BR[9p]PW[Meng Tailing]WR[6p]KM[6.5]
TM[60]RE[B+4.5]MULTIGOGM[1]
;B[pd];W[dd];B[qp];W[dq];B[nq];W[qf];B[nc];W[qj];B[co];W[ck]C[See var for Black 11]
(;B[fp]TR[nq][qf][nc][qj]LB[ep:A]C[ Previously, the Taisha (Black 11) was commonly played in openings without the 5~8 (marked) exchange, but in the game position, pressing at A has been the usual move. ]
;W[ep];B[eo];W[fq];B[gp];W[gq];B[hp];W[hq];B[ip]C[AlphaGo has played this sequence to 19 (with Black) in 5 of the 60 games. As I commented  at move 11, this choice of joseki is a bit rare when Black has the shimari at 5, but now I expect that top pros will be trying it out in serious games. 
 Covering on the lower side is still a big move for Black (see 2 vars). ]
(;W[iq]C[The general rule is to jump on the third line as soon as it becomes possible, so crawling at 20 is bad locally. However if Black will answer, it works well for White in this overall position because the left side is important (see var). ]
(;B[ci]LB[jp:A]C[Conventional wisdom indicates that Black should be happy to extend at A to make thickness, but Black might have trouble making full use of that wall in this overall position. It is usually bad to allow a White hane at A, but arguably the Black shimari in the LR corner reduces the value of such a move. This is one of many positions in which AlphaGo is forcing us to rethink our set of values. ]
;W[jp];B[cf]C[AlphaGo's superior positional judgement has always been a strong point. In this game AlphaGo's play is suprising in that it breaks a rule of thumb that we use (I'm still talking about allowing W22). However, now that we have seen it in action, it works in a fairly simple and logical fashion that we can understand.]
;W[fo]C[Black's 4 stones are in damezumari, so White cuts at 24 to exploit that weakness. Was this a good move? After seeing the following sequence to Black 57, I can say that White 24 was a mistake in the direction of play. ]
;B[dp];W[eq];B[fn];W[go];B[en]C[Go ahead and take them! Being stuck to a living White group, those 4 Black stones aren't so big anyway. ]
;W[gn];B[cq]LB[gm:A][io:B]C[With 31 Black makes a living shape. Not playing the forcing move at A, Black leaves the possibility of escaping at B. ]
;W[gm];B[fc]C[While dodging White's attack, Black has taken 3 big opening points, Black 21, 23, and 33. ]
;W[fd];B[gd];W[fe];B[ec];W[dc];B[be]LB[ci:A]C[Black 39 takes away White's base, and works well in this position, as Black already has the extension at A.  ]
;W[cr];B[fl]LB[bq:A]C[Black can live with A, but attacks on the left side first.]
;W[ek];B[el];W[ei];B[fk];W[di];B[ch];W[fj];B[eg];W[df];B[de];W[ed];B[hc];W[fg];B[ef]
;W[ff];B[jd];W[gj];B[bq]LB[hk:A]C[As the fight continues, Black territory appears in all parts of the board. Black can jump out at A, so it will be difficult for White to surround the center. This already looks good for Black. ]
;W[md]C[White challenges Black to a fight. ];B[pf];W[pg];B[of];W[qe];B[qd];W[mc]
;B[nb];W[lf];B[pi]C[Blkack is trying to press White down on the right side, thus reducing the center and attacking White on the upper side. ]
;W[qi];B[ph];W[og]C[White pushes through to fight strongly. ];B[qh];W[qg];B[rh]
;W[pj];B[ni];W[od]LB[pe:A][oc:B]C[This is a tesuji, testing Black's response before connecting in the center. If Black A, White can make use of the aji at B later. ]
;B[nd];W[ne];B[nf];W[ng]C[White's tesuji from 78~82 is worth savoring. White squeezes Black to fix his shape in the center. ]
;B[me];W[oj]C[84 is a vital point in shape. ];B[mf];W[mg];B[le]C[AlphaGo makes a trade, saying goodbye to the fight and heading to an early endgame. After playing so strongly with 69~75, this change of pace is unexpected, but maybe not wrong.  I believe it is supported by a correct assessment of the overall position. ]
;W[rd];B[rc];W[pe];B[oe];W[re]LB[qc:A]C[White 92 looks to cut at A next, stopping Black from escaping in the center by strengthening the White group. ]
;B[qm];W[om];B[op]LB[nn:A][hk:B][kf:C]C[Black 93~95 was the final big point. The game now enters the endgame, with the focus being on how much territory White can make in the center. Black has reducing moves such as A, B, and C that will make it difficult for White to get enough. End of commentary. ]
;W[no];B[hk];W[gk];B[gl];W[hl];B[hm];W[il];B[hn];W[im];B[ho];W[in];B[kf];W[io];B[kh]
;W[lg];B[kg];W[qc];B[pc];W[qb];B[pb];W[li];B[lh];W[mh];B[rb];W[ki];B[ji];W[mi];B[rk]
;W[rj];B[oo];W[pn];B[rn];W[nn];B[jj];W[ih];B[jh];W[br];B[cm];W[qq];B[rp];W[qo];B[ro]
;W[mq];B[mr];W[lr];B[nr];W[mp];B[bc];W[kk];B[jk];W[bl];B[kj];W[lk];B[bm];W[aq];B[ap]
;W[ar];B[bo];W[bj];B[jl];W[km];B[qk];W[sk];B[sl];W[sj];B[ol];W[nl];B[ok];W[pk];B[pl]
;W[nk];B[db];W[cb];B[eb];W[cc];B[cd];W[eh];B[dg];W[bb];B[ab];W[he];B[hi];W[hj];B[ii]
;W[je];B[ke];W[dl];B[gi];W[fi];B[gh];W[fh];B[bi];W[cj];B[ls];W[kr];B[ql];W[hd];B[id]
;W[np];B[pq];W[dm];B[dn];W[qn];B[ie];W[ge];B[gc];W[if];B[ig];W[hg];B[jf];W[jg];B[kl]
;W[ll];B[ig];W[ad];B[ac];W[jg];B[jm];W[jn];B[ig];W[bp];B[cp];W[jg];B[ks];W[js];B[ms]
;W[ig];B[ik];W[ai];B[ah];W[aj];B[al];W[ak];B[am];W[gg];B[lm];W[kn];B[cl];W[sm];B[rl]
;W[sd];B[dk];W[dj];B[jr];W[is];B[ir];W[hs];B[hr];W[gs];B[dr];W[er];B[es];W[gr];B[kq]
;W[lq];B[sc];W[on];B[lj];W[mj];B[ml];W[mk];B[nh];W[nj];B[po];W[dh];B[bg];W[da];B[ea]
;W[ca];B[bk];W[qa];B[pa];W[bl];B[bd];W[pr];B[qr];W[bk];B[em];W[dk];B[rm])
(;B[jp];W[cf];B[jq];W[qm]LB[iq:A][bq:B]C[Thanks to White's crawling at A once, Black 3 is not so big now, and White has enough eye space in the corner to ignore the threat of Black B. This is good for White.]))
(;W[jq];B[ci];W[ek];B[cf];W[ce];B[df];W[fd];B[ei];W[gk]C[White 1 is the joseki move. This was played by Fan Tingyu in game 27. I would suggest the sequence to 9 as a normal continuation. ])
(;W[cf];B[iq];W[bp];B[ql]C[Black 2 is big, and I would be happy with Black after 4. ]))
(;B[ep];W[eq];B[fp];W[gq]TR[qf][nc]LB[ci:A][cf:B][qh:C]C[Pressing at Black 1 is a common joseki choice in this opening. After White 4, I would want to play at A or B with Black, and I have seen top pros invade at C also. AlphaGo actually played this joseki in 2/60 games with a very similar opening, but there was a subtle difference. AlphaGo played this joseki when White's UR kakari and Black's keima (marked) were not exchanged. ]))
