(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]TM[60]
PW[Yu Zhiying]PB[Magist]WR[5p]BR[9p]DT[2016-12-29 20:51:02]RO[05]PC[Tygem]C[This the most popular opening played vs Master, so we get to know particularly well what Master is thinking.

Highlights

1-9 Master shows its logic in the opening, supporting many ideas that are centuries old. But these days pros play anything in the opening. !!

11-24 A very common sort of opening in pro games, good to see Master agreeing with 11, but 21 and 27 are stunning new moves. B takes huge profit at the top, and thinks hane at the head of 4 stones isn't so important !!!

37-52 A excellent sequence to sacrifice B's weak group, and punish 36 for being slow. B's lead becomes very clear. And we get to open our mind that even such a big group is sacrificeable. !!

53 If this move is optimal, it changes our recognition of this shape. Crude but clear, more of attaching on top of 3rd line stones. !

end B+17.5
]RE[B+Resign]TC[3]TT[20]
;B[pd]C[Master prefers 4-4 to open, without choosing a direction, (not yet showing its cards)]
;W[dd]
;B[qp]
;W[dq]
(;B[nq]C[It is reassuring to see Master value the 3-4 enclosures highly, and never playing double 4-4 as black. This is similar to pro thought.

Whereas leelabot thinks the 3-4 and the enclosure are too slow.]
(;W[qf]
;B[nc]
;W[qj]
;B[co]C[master likes the low approach so much, thinking that this makes the 3-4 stone very uncomfortable]
(;W[ck]C[Master thinks W should have protected earlier, I wonder if it still likes this pincer?]
;B[fp]C[It values this move more than humans. Pros probably think it is hard to use this wall, even though logically following up against the 3-4 should be powerful (C9 is sort of a local tenuki)]
(;W[ep]
;B[eo]
;W[fq]
;B[gp]
;W[gq]
;B[hp]
;W[hq]
;B[ip]
(;W[iq]C[this is to get sente and is the reason pros haven't dared to play this as B in the past (according to Meng)]
(;B[ci]C[so this tenuki is very interesting]
(;W[ek]
;B[cf]
;W[ei]
(;B[bd]C[played before in pro games but rare]
;W[ef]C[thought to be good for W as the left B shape is weak so ]
(;B[fd]C[new move !! brilliant

if you can't hope to cut then poke instead]
(;W[df]C[correct exchange for W, gains later if B gets 3-3 and creates more B12 aji]
(;B[ce]
;W[ed]
;B[jd]C[so B's shape on the left still has issues, but W's influence looks silly without the extension. And it doesn't have great eyespace with the shape poked out and made heavy]
;W[jp]C[the question is whether this move is worth the territory loss at the top?

It does look very powerful  - though it is only hane at the head of 4 not 3 or 2, the cut at D5 means the F5 cut is more powerful.]
;B[jo]C[! looks crude, and I'm not sure I would think of this, but the 4 stones are now heavy and important to strengthen at the cost of the right]
(;W[kp]C[there is still good endgame at L2]
(;B[fc]C[W's influence looks really weak now]
(;W[rd]C[master almost never plays this move, thinking it too slow, either invading the corner with R17 or living with R16, or tenuki

probably this move was a mistake in this position, and the following trade was almost inevitable once B started it.]
;B[dj]C[this combination stops W B12, but as B11 remains, it seems incredibly crude. 

-the goal is also to break the W eyespace and flexibility though
-and to save the lower B group via D9]
(;W[ej]
;B[dh]
(;W[fn]C[it's normal to expect B to answer here, so this is a  good move]
(;B[eh]C[but the tenuki seems correct]
;W[ge]C[it's not clear if this makes a good exchange, but the game result means that B retreats a move, so it probably turned out well. I wonder if B could have played more fiercely]
;B[gh]C[only move]
;W[fo]C[only move]
(;B[hd]C[B comes back to protect small, without G15, B might aim to make a large capture around J13]
;W[hg]
;B[gg]C[a bit submissive, defends against wedge aji, but primarily aims to solidly capture E14 or get sente

I don't see why B responds since W is already disconnected]
(;W[cj]C[stopping the cut]
;B[hf]C[W's play means B's capture isn't so big, and W's capture is worth more points, but W has to spend another move, and J4 is not yet dead, so the trade seems even.

(B's group was already weak, so sacrificing it means B has less worries)]
(;W[bq]C[it is too easy for B to live without this move]
(;B[bi]C[huge, over 20 points + aji in W's area]
(;W[hj]C[this is a solid and proper move

the position is now settled, and we can evaluate who has the advantage.

W has 40 solid points at the bottom, maybe 15 on the right, and say potential of 15 in the centre

B has 70 solid points at the top, less than 10 on the bottom right (W is so solid), and maybe potential of 10 in the centre

there are 2 big endgame points remaining around R7 and R17

since B has sente, B seems to have a clear lead]
(;B[pf]C[this seems to be solidifying the weakness that W has, but maybe this is just a good exchange to press W low in the position (the direction of play is good), to help gain control of the centre in sente]
;W[pg]
;B[of]
(;W[ph]C[the most solid move for the centre, though a little painful to protect so solidly, perhaps correct]
(;B[jj]C[expected, helping reduce the W potential, and growing B's own]
;W[mh]C[W has some weaknesses in the shape, but it can't be helped]
;B[jl]
;W[le]C[W is happy to get this exchange]
;B[lc]
;W[if]
;B[he]
;W[qn]
;B[op]C[I had almost wondered if master ever protects here, but reassuringly, it plays what humans would play.]
;W[rp]
;B[rq]
;W[qo]
;B[pp]
(;W[on]C[this is probably a slight overplay, ending up in a bad place, but understandable]
;B[hl]
;W[hn]
;B[in]
;W[hm]
;B[im]
;W[gl]
;B[mk]
;W[qc]
;B[ok]C[simple moves are good enough to break W's shape]
;W[pl]
;B[qe]
;W[re]
;B[qg]
;W[rf]
;B[nh]
;W[ii]
;B[pi]
;W[qh]
;B[qi]
;W[ri]
;B[pj]
;W[qk]
;B[kh]
;W[jg]
;B[mg]
(;W[mr]C[this looks like a good move to prevent L2]
;B[lq]
;W[lr]
;B[kq]
;W[mq]
;B[lp]
;W[jq]
;B[kr]
;W[mp]
;B[lo]
;W[no]C[W's area is a little hurt, and B makes extra points in the centre, but the bottom right corner is very hurt, so W gets sente]
(;B[ro]
;W[rn]
;B[sp]
;W[bj]C[B should probably have exchanged the monkey jump earlier]
;B[di]
;W[dk]
;B[kf]C[B+R as]
(;W[ps]
;B[qr]
;W[ob]
;B[oc]
;W[nb]
;B[mb]
;W[pc]
;B[na]
;W[pb]
;B[sn]
;W[sm]
;B[so]
;W[rm]
(;B[hs]
;W[hr]
;B[mn]
;W[nm]
;B[mm]
;W[nl]
;B[nk]
;W[go]
;B[io]
;W[ko]
;B[kn]
;W[hk]
;B[il]
;W[kg]
;B[lg]
;W[jh]
;B[ki]
;W[oh]
;B[ni]
;W[og]
;B[ng]
;W[qd]
;B[pe]
;W[fi]
;B[or]
;W[os]
;B[pr]
;W[ns]
;B[is]
;W[gs]
;B[ks]
;W[ml]
;B[ll]
;W[ik]
;B[jk]
;W[ie]
;B[id]
;W[fh]
;B[fg]
;W[ai]
;B[ah]
;W[aj]
;B[bh]
;W[oa]
;B[ma]
;W[ol]
;B[po]
;W[pn]
;B[gi]
;W[gj]
;B[oi]
;W[rh]
;B[qs]
;W[je]
;B[ke]
;W[nr]
;B[np]
;W[mo]
;B[hh]
;W[ig]
;B[ls]
;W[ir]
;B[js]
;W[jr]
;B[ln]TW[pa][qa][ra][sa][qb][rb][sb][rc][sc][sd][se][sf][qg][rg][sg][sh][si][fj][rj][sj][ak][bk][fk][gk][rk][sk][al][bl][cl][dl][el][fl][ql][rl][sl][am][bm][cm][dm][em][fm][gm][om][pm][qm][an][bn][cn][dn][en][gn][ao][bo][co][do][eo][ap][bp][cp][dp][aq][cq][eq][ar][br][cr][dr][er][fr][gr][as][bs][cs][ds][es][fs]TB[aa][ba][ca][da][ea][fa][ga][ha][ia][ja][ka][la][ab][bb][cb][db][eb][fb][gb][hb][ib][jb][kb][lb][ac][bc][cc][dc][ec][gc][hc][ic][jc][kc][mc][ad][cd][dd][ed][gd][kd][ld][md][nd][od][ae][be][de][ee][fe][ge][le][me][ne][oe][af][bf][df][ef][ff][gf][lf][mf][nf][ag][bg][cg][dg][eg][ch][lh][mh][li][mi][kj][lj][mj][nj][oj][kk][lk][kl][jm][km][lm][jn][rp][oq][pq][qq][sq][rr][sr][rs][ss]C[B+17.5])
(;B[gm]C[this doesn't quite work]
;W[hk]
(;B[gn]
;W[il]
(;B[fm]
;W[go]
;B[ho]
;W[io])
(;B[ho]
;W[fm]
;B[hl]
;W[hm]))
(;B[il]
;W[go]
;B[io]
;W[fl])))
(;W[ng]C[this doesn't work]
;B[og]
;W[lg]C[not sente]
;B[kg]))
(;B[pc]
;W[ro]
;B[qr]C[if N2 is sente, B can't easily monkey jump at H1, so this is a big deal]
;W[ms]
(;B[js]
;W[pr]C[troublesome]
(;B[nr]
;W[np])
(;B[np]
;W[mo]C[W is satisfied to get this move]
;B[nr]))
(;B[or]
;W[bj]
;B[hs]
;W[jr]
;B[js]
;W[ks]C[W has the ko option])))
(;W[ob]C[huge, but B is solid enough that this is gote]))
(;W[om])
(;W[pl]))
(;B[kj]C[in this case this would seem a little slack, as B is solid above]))
(;W[qe]C[sometimes this is correct, making P13 huge for both sides]
;B[pi]C[this is shape])
(;W[og]C[this would be a standard attempt to fight back, but the direction doesn't seem great as B has potential in the centre but W doesn't have much potential on the right]
;B[qe]
;W[re]
;B[qg]
;W[rf]
;B[ng]
;W[nh]
;B[mh]
;W[ni]
;B[mi]
;W[nj]
;B[mj]C[the R4 stone is well placed, and W's potential in the centre is reduced]
;W[nk]
;B[mk]
(;W[nf]
;B[mg]
;W[od]
;B[pc]C[I'm not sure there is any aji here])
(;W[nl]
(;B[qk]C[still some bad aji around here]
;W[qn]C[though overplay at the moment])
(;B[qm]
;W[qq]))))
(;B[]
;W[of]C[this is huge to aim at L16, and B thinks B can't easily aim to invade R12 anyway, so may as well settle the position]))
(;W[ij]C[this is tempting, but probably an overplay when B has no weakness above

the W group is still cut by E5, so W does need to be a little careful]
(;B[gj]
;W[gk]
;B[hk]
;W[hj]
;B[gl]
;W[fk]
;B[ik])
(;B[fm]))
(;W[hk]C[more solid but B will probably aim to sacrifice J4 now and grow B's area more]
;B[jj]C[still here]))
(;B[]
;W[bi]C[if B responds to this, W has already gained, but W B12 is also huge sente endgame]
;B[bh]
;W[di]C[W doesn't have to play here (B might tenuki) and W has already gained points]
;B[ch]C[11 points in sente]))
(;W[hj]
;B[dp]
;W[eq]
;B[cq]
(;W[cr]
;B[en]
;W[fm]
;B[bq]
(;W[bn]
;B[br]
;W[dr]
;B[cn]
;W[bo]
(;B[cl])
(;B[bs]C[even this lives]))
(;W[br]
;B[cm]))
(;W[bq]C[the most severe try]
(;B[bp]C[ko exists already]
;W[cr]
;B[br])
(;B[cr]
;W[bp]
;B[cp]
(;W[bo]
;B[en]
;W[fm]
;B[bn])
(;W[bn]
;B[en]
;W[fm]
;B[bo]
;W[ao]
;B[bm])))
(;W[bn]C[a good move to attack]
;B[en]
;W[fm]
;B[cn]
;W[bm]
;B[bo])))
(;W[gf]C[this would be heavy shape]
(;B[hh])
(;B[dk]
;W[dl]
;B[cl]C[huge])))
(;B[ig]
;W[hc]C[this is very bad aji - even if B saves F17 with space at M17, W can live comfortably]))
(;B[fo]C[the plan]
;W[eh]
;B[dk]
;W[dl]
;B[el]C[this is much less powerful now]
;W[fl]
;B[em]
;W[en]
;B[fm]
;W[gm]
;B[dm]
;W[dn]
;B[cl]
;W[cm]
;B[dl]
;W[do]))
(;W[eh]
(;B[fg]C[this is the standard follow up to break the eyespace flexibility, but in this case it is slightly premature, leaving weaknesses on the left]
;W[eg]
;B[dk]
;W[dl]
;B[el]
;W[cg]
;B[bg]
;W[bh]
;B[ch]
;W[cj]
;B[di]
;W[bi])
(;B[dk]
;W[dl]
;B[el]C[this seems to be the plan])))
(;W[dk]
;B[ej]
;W[fj]
;B[fi]C[this is a problem]
;W[eh]C[though this is sente]
(;B[bi]C[it doesn't help W ])
(;B[gi]
;W[ch]
;B[bh]
;W[bi]))
(;W[bh]C[maybe this is good timing]
;B[ch]
;W[ej]C[though W's shape is still pretty bad]))
(;W[fo]C[I'm not sure what B plays here]
(;B[dp]
;W[eq]
;B[fn]
;W[go]
;B[en]C[continue aiming at the top?])
(;B[qh])
(;B[dj]))
(;W[bh]C[this seems proper now]
(;B[ch]
;W[bi]
;B[bg]
;W[cj]
;B[cc]C[as B takes gote with more points, but W needs the eyespace]
;W[rd]
;B[eh]C[there remains bad aji though, but W may sacrifice to attack the lower B group.

Though W has taken gote enough times that the B group is annoyingly flexible and sacrificeable]
;W[fh]
;B[dh]
(;W[fg]
;B[fj])
(;W[fi]
;B[fg]
;W[fo]))
(;B[bi]C[this doesn't seem to make sense?]
(;W[ch]
;B[dh]
;W[di]
;B[dg]
(;W[cj]
;B[bg]
;W[bj]
;B[fh])
(;W[eh]
;B[eg]
;W[fg]
;B[cg]
;W[cj]))
(;W[cg]
;B[dh]
;W[dg]
;B[eh]
;W[cc]))))
(;B[kr]
;W[jr]
;B[kq]
;W[jq]))
(;W[ko]C[double hane seems like a possibility]
;B[kp]
;W[jq]
;B[jn]
;W[kn]C[the upper W group is unhappy, but locally the B shape is still bad, and W hurts the bottom right corner more]
;B[jm]
;W[lp]))
(;B[cg]C[wrong place we think]
;W[jd]))
(;W[ed]
;B[cc]C[maybe just here? (says meng) as W already has no local follow up (D17 or D18 would make E16 overconcentrated)

(therefore B has gained a lot of territory)]))
(;B[cc]
(;W[cg]C[some issues remain])
(;W[bh])
(;W[jp]
;B[fd]C[later W will tenuki this as D16 is light]
(;W[hc]C[maybe aim to play here later])
(;W[fo])
(;W[dc]C[eventually aim here]))))
(;B[ef]
;W[fc]
;B[bd]
;W[ic]C[the standard pro variation locally (here due to K4, it would probably be different)

considered fine for W as E9 is not so weak with the D13 B12 combo]))
(;W[jp]C[this hane is still powerful, though not at the head of 2 or 3 (so B is stronger, but B is heavier), with the D5 cutting issue as well so F5 is more powerful

see game 9])
(;W[cg]C[see game 14]
;B[dj]
;W[dk]
;B[ek]
;W[el]
(;B[fl]
;W[ej]
;B[fk]
;W[ei]
;B[dh]
;W[di]
;B[ch]
;W[cj])
(;B[fk]C[this might be more appropriate as B is more solid here])))
(;B[jp]
;W[cf]
;B[jq]C[this is not as big anymore, so close to O3 when corner aji remains]))
(;W[jq]C[normally jump]))
(;W[do]C[I doubt master is fond of this either, it reminds me of it's play vs the Kobayashi (game 4)]
;B[dn]
;W[eo]
;B[cp]
;W[fo]
;B[cq]
;W[er]
;B[dr]
;W[eq]
(;B[cm]C[would it protect?

B's shape is very good and efficient, and W seems overconcentrated especially as B already has O3])
(;B[fc])))
(;W[ep]C[I know it hates this move, so I wonder what it would play. since B already has the enclosure on the right, there isn't much weakness to lean on to fight locally]))
(;W[do]C[Master's games show a protection before invading, otherwise the 3-4 stone can get pressured too much]))
(;B[co]
;W[oq]C[and this is also what Master plays - if you stop my enclosure, I must stop yours (back to a very classical way of thinking)]))