(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[7.50]
GN[ ]PW[Sorin Gherman]PB[Sean Zhou]WR[7d]DT[2017- 8-11]GC[Sean Zhou http://agagd.usgo.org/player/23398/]EV[US Go Congress, Masters]RO[7]PC[San Diego, CA]C[Commentary by Yamashiro Hiroshi 9p]RE[W+20.50]FG[259:]PM[2]
;B[cp]
;W[pd]
;B[dc]
;W[pp]
;B[eq]
;W[cf]
;B[cd]
;W[dj]
;B[nq]
;W[co]
;B[bp]LB[do:A]C[Too slow for black, it is like white played a forcing move.

At A is black's active response.]
(;W[qn]LB[eo:A]C[Better play at A, to take advantage of black's slow move.]
;B[pr]
(;W[fc]LB[gd:A][eo:B]C[Overplay, locally A is better.
Globally, white should play at B.]
;B[ee]C[Good move. Black has miai to aim at white's left or upper side positions.]
;W[ef]
(;B[gd]C[Very good move for black, said Yamashiro.
I definitely underappreciated this move during the game, I thought it to be slow.
See the variation too.]
;W[hc]
;B[ff]C[Bad exchange, white is happy to respond.]
;W[eg]
;B[ql]
(;W[qq]LB[nn:A]C[Too passive, better at A.]
;B[no]
(;W[on]LB[mp:A][np:B][mq:C][qr:D]C[Better to just live with D, and aim at the A-B-C combination later.]
;B[nn]
;W[om]
;B[cl]
(;W[fp]
;B[ep]
;W[dl]
;B[dm]LB[el:A][cm:B]
(;W[el]LB[cm:A]C[Better at A.]
(;B[fo]LB[ck:A]C[Should be at A.]
(;W[go]LB[ck:A]C[Better at A, very large.]
;B[gn]
;W[fn]
;B[eo]LB[hn:A][ho:B]C[White has a choice next - A or B?]
(;W[hn]LB[ho:A]C[Better to just extend at A, to keep black's stone weak.]
;B[gm]
;W[hp]
(;B[em]LB[jq:A]C[Should be at A to attack white while making a base.]
(;W[kq]C[Good.]
;B[ko]
(;W[kp]LB[ln:C][mp:A][np:B][gr:D]C[Bad, losing the peep aji at A-B-C later.
White should just defend at D instead.]
;B[lo]LB[fq:A][gr:B]
(;W[fq]LB[gr:A]C[Yamashiro preferred the move directly at A better, since this one makes black's hane and connect "more sente".]
;B[pi]
;W[qg]
;B[qr]
;W[qj]
;B[ol]C[Very bad exchange for black.]
;W[nm]
;B[qi]
(;W[ri]LB[pj:A]C[Wrong: should be at A, or else black will reply there and get strong.]
(;B[rh]LB[pj:A]C[Wrong, overplay: black should be happy to play at A, punishing white's mistake.]
;W[rj]
;B[qh]C[Overplay.]
;W[pj]
;B[oj]
;W[oi]
;B[oh]
;W[ni]
;B[pk]
;W[nj]
;B[ok]
(;W[rg]LB[rl:A]C[At A is a more aggressive option.]
;B[sh]
;W[pg]
;B[ph]
;W[ng]
;B[rk]
;W[nh]
;B[sj]
;W[og]
;B[si]
;W[hd]C[White is winning.
The commentary ends here.]
;B[jf]
;W[kd]
;B[jd]
;W[jc]
;B[ke]
;W[le]
;B[pc]
;W[oc]
;B[cj]
;W[ci]
;B[ck]
;W[di]
;B[lf]
;W[ld]
;B[ml]
;W[mm]
;B[ro]
;W[rp]
;B[qo]
;W[rn]
;B[oo]
;W[po]
;B[pm]
;W[pn]
;B[rr]
;W[ll]
;B[mk]
;W[km]
;B[hf]
;W[be]
;B[bd]
;W[fr]
;B[er]
;W[gl]
;B[fm]
;W[mf])
(;W[rl]C[White also has this option, to fighti without sacrificing the stones.]
;B[rm]
;W[rk]
;B[qm]
;W[rg]
;B[sh]
;W[pg]
;B[ph]
;W[mg]))
(;B[pj]C[Correct.]))
(;W[pj]C[White should play here, to create defects in black's position.]
;B[oj]
;W[ri]
;B[oi]
;W[rk]))
(;W[gr]C[Maybe better.]))
(;W[gr]
;B[io]
(;W[ho]LB[ip:A]C[Bad, should be at A instead.]
;B[jq]
;W[jp]
;B[kp]
;W[jr]
;B[iq]
;W[ip]
;B[kr]
;W[lq]
;B[lr]C[Good for black.])
(;W[ip]C[Correct.]
;B[ho]
;W[gp]C[White is living with good territory.])))
(;W[mp]C[This may be tempting for white...]
(;B[np]LB[mq:A]C[Not good, black should resist with A.]
;W[mq]C[Very good for white, but black will not play this way.])
(;B[mq]C[Good.]
(;W[np]
;B[lp]C[Good for black.])
(;W[lp]
(;B[np]LB[lq:A]C[Bad, should be at A.]
;W[lq]C[Good for white.])
(;B[lq]
;W[np]
;B[kp])
(;B[lq]
;W[kp]
(;B[np]LB[kq:A]
;W[kq]C[Good for white.])
(;B[kq]))))))
(;B[jq]C[Black should play here, white is not good.]))
(;W[ho]C[Correct move. This is the variation that Yamashiro showed.]
;B[hn]
;W[in]
;B[io]
;W[hm]
;B[gm]
;W[gl]
;B[fm]
;W[em]
;B[en]
;W[fl]
;B[fn]
;W[jo]
;B[ip]
;W[jp]
;B[iq]
;W[jq]
;B[jn]
;W[im]
;B[kn]
;W[ir]
;B[gp]
;W[mp]
;B[np]
;W[mq]
;B[mr]
;W[lr]
;B[nr]
;W[kr]C[White lives, the black group becomes a target.]))
(;W[ck]
;B[in]LB[kn:A]C[During the game I was concerned with black playing this way, but Yamashiro said that is not territory, white can reduce with A.]
;W[kn]))
(;B[ck]C[Very large, sente move.]))
(;W[cm]C[Again, white should play here.]
;B[bl]
;W[el]
;B[cn]
;W[dn]
;B[bm]
;W[em]))
(;W[dl]TR[co][bp]C[Best move, to take advantage of the triangle marked exchange.]
;B[dm]
;W[cm]
;B[bl]LB[ci:A][cn:B]C[This is the move that I was concerned with during the game, I thought it is good for black since he has A and B miai.

Yamashiro disagreed, and suggested to not be so worried about territory anymore, but focus on thickness instead.]
;W[el]
;B[cn]
;W[dn]
;B[bm]
;W[em]C[White is happy to build thickness, so black's framework on the lower side cannot work well.]))
(;W[qr]C[Better than the game, white is 100% alive.]))
(;W[nn]LB[pk:B][mp:A]C[Better, more active for white in this case. White has miai to press at A or B next.]
;B[qi]
;W[mp]))
(;B[ff]
;W[eg]
;B[hd]C[This was my concern during the game, Yamashiro disagreed and said the way black played in the game is better.]
;W[hc]
;B[ic]
;W[id]
;B[jc]
;W[fe]
;B[ge]
;W[fd]
;B[gf]
;W[cb]C[White can fight, this can be risky for black.]))
(;W[eo]
;B[fp]
;W[gn]
(;B[ch]
;W[dh]LB[di:A]C[Black cannot play A since the ladder is bad for him.])
(;B[cn]
;W[dn]
;B[bn]
;W[cm]C[White should not be concerned about the territory on the left side, but be happy with the thickness built in the center.])))
(;W[eo]
;B[fp]
;W[gn]))
