(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[6.50]
PW[StephenM]PB[花林渡]WR[7k]BR[6k]DT[2015-04-22]CP[online-go.com]PC[OGS: http://online-go.com/game/1921158]RE[B+Resign]
;B[pd]
;W[dp]
;B[pq]
;W[dd]
;B[qk]
;W[nc]
;B[pf]
(;W[qc]
;B[pc]
;W[pb]
;B[ob]
;W[qb]
;B[oc]
;W[re]
;B[rf]
;W[qe]
;B[qf]
;W[jq]C[Big, but had you considered bS16 as a response?]
(;B[pe]
;W[qd]
;B[fc]
;W[hc]
;B[cc]
(;W[cd]TR[ci][di][cj][dj][ck][dk]C[Generally the wrong side to block if you don't already have a stone in the marked area, as Black finishes with sente.]
;B[dc]
;W[ed]
;B[fb]
;W[ge]
;B[ck]
;W[ci]
;B[cn]
(;W[bp]C[Kicking is another option.]
;B[cg]
(;W[dg]
;B[ch]
;W[dh]
;B[bi]
(;W[dj]C[Connect at D11 and take sente. Deprive black of an atari that fixes his problems at the same time.]
;B[cj]
;W[di]
;B[cf]
;W[ne]
;B[ng]
;W[lg]C[Awkward shape, bu seems interesting if you think it's not too big to sacrifice O15 and O17 as in the game.]
;B[mf]
;W[lf]
;B[le]
;W[ke]
;B[ld]
;W[kd]
;B[lc]
;W[kc]
;B[kb]
;W[jb]
;B[lb]TR[eg][jg][ej][jj]SQ[ni][ri][nn][rn]C[A big profit for Black. The value for White is still to be determined by whether he can make his points in the triangled area without having to give Black the whole square area.]
;W[qo]
;B[mq]
;W[qq]
(;B[pp]C[Urk. Black had to hane.]
;W[qp]
;B[fq]C[Vital point in the shape, and one of the problems with the B4 response earlier.]
;W[eq]C[Weakens K3, and doesn't fix your corner. ]
;B[fp]
;W[hq]
;B[ho]
;W[ko]
;B[do]
;W[co]
;B[eo]
;W[mo]
;B[cq]
;W[dq]
;B[cp])
(;B[qr]
;W[pp]
;B[oq]
;W[rq]C[Common.]))
(;W[di]
;B[bj]
;W[mq]
;B[po]
;W[nd]C[Another game.]))
(;W[dh]C[The only move to really threaten C13 and prevent connection. However, it comes with its own complications]
;B[ef]C[Aiming at the F16 cut and treating C13 lightly.]
(;W[dg]C[This might look like a cut, but it's not interesting.]
;B[df]
;W[cf]
;B[ce]
;W[bf]
;B[be]
;W[bg]
;B[bd]C[Black is happy.])
(;W[fg]C[All in!]
;B[fd]
;W[fe]
;B[ee]
;W[cf]C[Lots of very complicated reading from here.]))
(;W[ei]C[This looks like a refutation, but ....]
;B[bi]
;W[bh]
;B[ch]
;W[bj]
;B[di]
;W[cj]
;B[dj]C[This is complicated. Black has some awkward cuts, but White also risks having only one eye on the left edge. If anything goes wrong for White here, Black is stable, connected and has trashed some of the value of White's result in the top left.])
(;W[eh]
;B[bi]
;W[bh]
;B[ch]
;W[bj]
;B[di]
;W[cj]
;B[dj]
;W[dh]
;B[bk]
;W[ai]
;B[ek]
;W[bg]C[Another possibility]))
(;W[co]
;B[dn]TR[ck][cn][dn]C[The marked stones are a bit close to each other now.]
;W[fp]))
(;W[dc]
;B[cd]
;W[de]
;B[db]
;W[eb]
;B[cb]
;W[ec]
;B[cf]C[White took a nominally Black corner, Black took a nominally White one .. and you have sente, can't complain really :)]
(;W[eg]
;B[cg]C[One continuation, of great interest when you can work nicely with the top. With Black's wall, it feels like playing the other variation directly is both better and interesting enough to do immediately.])
(;W[ch]
;B[df]
;W[ef]
;B[eg]
;W[ff]
;B[dh]
;W[di]
;B[ei]
;W[dj]LB[po:B][mp:A]TR[mq]C[It may be worth exchanging "A" (or the marked point) for "B" before this line. But this seems to be a nice way to make some headway on the remaining area. The 3-3 aji at C3 is still painful as Black can take it in sente, and Black has K17, threatening to do something with F17 while trying to swallow O17 on a large scale. Both are very large now.])))
(;B[rd]
;W[qd]
;B[se]
;W[rc]
;B[sd]
;W[sc]
;B[sf]
;W[pe]
;B[oe]
;W[ra]
;B[pa]
;W[sb]TR[pa][se][sf]C[The exchange is quite useful for Black, and sente. The marked stones make it hard to make use of the remaining aji White should have from this corner invasion.]))
(;W[jd]C[Another game.]))