(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]
RU[Japanese]SZ[19]KM[6.50]
PW[Yang Su I Ting]PB[Walther]
;B[pd]CR[pd]
;W[cp]CR[cp]
;B[pp]CR[pp]
;W[dc]CR[dc]
;B[ep]CR[ep]
;W[gq]CR[gq]
;B[cq]CR[cq]
;W[dq]CR[dq]
;B[dp]CR[dp]
;W[eq]CR[eq]
;B[fq]CR[fq]
;W[fr]CR[fr]
;B[fp]CR[fp]
;W[cr]CR[cr]
;B[bq]CR[bq]
;W[co]CR[co]
;B[gr]CR[gr]
;W[er]CR[er]
;B[hq]CR[hq]
(;W[qn]CR[qn]
;B[np]CR[np]
;W[rp]CR[rp]
;B[gp]CR[gp]
;W[qq]CR[qq]
(;B[pq]CR[pq]
;W[nc]CR[nc]
;B[de]CR[de]
;W[qf]CR[qf]
;B[oe]CR[oe]
;W[qc]CR[qc]
;B[cc]CR[cc]
;W[cb]CR[cb]
;B[cd]CR[cd]
;W[eb]CR[eb]
;B[ch]CR[ch]
;W[fd]CR[fd]
;B[pg]CR[pg]C[This is a good move]
;W[pc]CR[pc]
;B[om]CR[om]C[This is a good move]
;W[me]CR[me]
;B[qp]CR[qp]
;W[rr]CR[rr]
;B[qr]CR[qr]
;W[rq]CR[rq]
;B[ql]CR[ql]
;W[pr]CR[pr]
;B[or]CR[or]
;W[qs]CR[qs]
(;B[qg]CR[qg]C[This move is the wrong direction.]
;W[jd]CR[jd]
;B[jk]CR[jk]C[B is strong enough on the board that this move can be at k10]
;W[il]CR[il]
(;B[km]CR[km]C[this is too ugly, moving back towards thickness]
;W[io]CR[io]
;B[jp]CR[jp]
;W[ip]CR[ip]
;B[iq]CR[iq]
;W[kn]CR[kn]
;B[jm]CR[jm]
;W[hn]CR[hn]
;B[in]CR[in]
;W[ho]CR[ho]
;B[jo]CR[jo]
;W[im]CR[im]
;B[jn]CR[jn]
;W[ik]CR[ik]
;B[jj]CR[jj]
;W[mg]CR[mg]
(;B[nh]CR[nh]C[Black can't answer here, the territory is already not enough. If Black wants to kill the group in the center, he should do so directly, otherwise white may get some moves on the outside that will help it live.]
;W[mh]CR[mh]
;B[mi]CR[mi]
;W[li]CR[li]
;B[mj]CR[mj]
;W[ng]CR[ng]
;B[oh]CR[oh]
;W[pm]CR[pm]
;B[pl]CR[pl]
;W[on]CR[on]
;B[nn]CR[nn]
;W[oq]CR[oq]
;B[op]CR[op]
;W[nq]CR[nq]
;B[mq]CR[mq]
;W[re]CR[re]
;B[br]CR[br]
;W[bs]CR[bs]
;B[gm]CR[gm]
;W[hm]CR[hm]
;B[gl]CR[gl]
;W[hj]CR[hj]
;B[ih]CR[ih]
;W[fj]CR[fj]
;B[gh]CR[gh]
;W[cj]CR[cj]
;B[dl]CR[dl]
;W[fh]CR[fh]
;B[gi]CR[gi]
;W[gj]CR[gj]
;B[fi]CR[fi]
;W[ek]CR[ek]
;B[el]CR[el]
;W[ci]CR[ci]
(;B[dh]CR[dh]
;W[bl]CR[bl]
;B[bm]CR[bm]
;W[cl]CR[cl]
;B[dk]CR[dk]
;W[dj]CR[dj]
;B[cm]CR[cm]
;W[dn]CR[dn]
;B[dm]CR[dm]
;W[en]CR[en]
;B[fn]CR[fn]
;W[ck]CR[ck]
(;B[bh]CR[bh]
;W[fo]CR[fo]
;B[eo]CR[eo]
;W[fm]CR[fm]
;B[gn]CR[gn]
;W[am]CR[am]
;B[bn]CR[bn]
;W[bo]CR[bo]
;B[fk]CR[fk]
;W[ej]CR[ej]
;B[ao]CR[ao]
;W[ap]CR[ap]
;B[an]CR[an]
;W[ii]CR[ii]
;B[ji]CR[ji]
;W[hh]CR[hh]
;B[hi]CR[hi]
;W[ei]CR[ei]
;B[gg]CR[gg]
;W[eh]CR[eh]
;B[ff]CR[ff]
;W[ef]CR[ef]
;B[ee]CR[ee]
;W[fe]CR[fe]
;B[ij]CR[ij]
;W[dg]CR[dg]
;B[cf]CR[cf]
;W[cg]CR[cg]
;B[bg]CR[bg]
;W[be]CR[be]
;B[bd]CR[bd]
;W[bf]CR[bf]
;B[af]CR[af]
;W[ae]CR[ae]
;B[ce]CR[ce])
(;B[cn]CR[cn]
;W[do]CR[do]
;B[em]CR[em]
;W[bh]CR[bh]
;B[bg]CR[bg]
;W[bj]CR[bj]
;B[ai]CR[ai]
;W[ah]CR[ah]
;B[ak]CR[ak]
;W[al]CR[al]
;B[aj]CR[aj]C[better way to kill white]))
(;B[dk]CR[dk]
;W[dj]CR[dj]
;B[ei]CR[ei]
;W[ej]CR[ej]
;B[bh]CR[bh]
;W[bl]CR[bl]
;B[bm]CR[bm]
;W[cm]CR[cm]
;B[bk]CR[bk]C[Yan laoshi's sequence to kill.]))
(;B[hi]CR[hi]C[Yan laoshi says if black plays here, he isn't sure how white can live.]))
(;B[ik]CR[ik]
;W[gl]CR[gl]
;B[hk]CR[hk]
;W[gn]CR[gn]
;B[do]CR[do]C[White has a problem in the corner here, so  it's hard for the center to run]))
(;B[mg]CR[mg]C[B here is the right direction]))
(;B[br]CR[br]
;W[bs]CR[bs]
;B[ds]CR[ds]
;W[cs]CR[cs]
;B[fs]CR[fs]
;W[dr]CR[dr]
;B[gs]CR[gs]
;W[es]CR[es]
;B[as]CR[as]
;W[ar]CR[ar]
;B[aq]CR[aq]
;W[bp]CR[bp]
;B[as]CR[as]C[Black can just play this ko and win.]))
(;W[br]CR[br]
;B[gp]CR[gp]C[This is joseki, black is very thick so this is better for black.]))