(;GM[1]FF[4]SZ[19]AP[SmartGo:2.8.3.0]
GN[Éý½µ¼¶¶Ô¾Ö]
PW[Chen Cheng-Hsun (Taipei)]WR[7d]
PB[Qiao Zhijian (China)]BR[7d]
EV[2012 WAGC]RO[5]
DT[20120515 [10:59]
KM[6.5]
RE[B+]
AN[Yang Shuang 3P];B[pd];W[dp];B[qp];W[dc];B[fq];W[cn];B[kq];W[qj];B[pk]
;W[qk];B[ql]LB[pl:A]
C[If W cuts, there will be a complicated fight (see var)]
(;W[pj]
C[so w just plays simply];B[pl];W[qf]
(;B[oj]LB[nd:A][nc:B][nj:C]
C[If B plays at A or B instead, W will jump at C; so black hanes at 15 to enlarge his moyo]
;W[oi]
(;B[nj];W[ni];B[mi];W[mj];B[mh];W[og];B[qe];W[rf];B[qh]
C[just a test move to see what white does; leaves aji for later];W[ph];B[mk]
;W[lj];B[lk];W[kj];B[kk];W[jj];B[il]
C[black's moyo is very big];W[nd];B[nc];W[mc];B[oc];W[md];B[pf];W[qg];B[of]
;W[nf];B[pg];W[rh];B[ng];W[oh];B[re];W[qc]
C[white wants to use the aji in the corner];B[pc];W[qb];B[mb]
C[this is bad for the outside, makes white strong, but it settles black's life in the corner. ]
;W[lb];B[nb];W[kc];B[pb];W[nk];B[ok]
(;W[ik]LB[qq:A]
C[white should test first with a probe at A, to see how black handles it. if the right-hand area all becomes territory it's too big. ]
;B[jk];W[ij];B[hl]
C[now black's enclosure is almost complete];W[df];B[jh];W[hh];B[hg];W[gh]
;B[mf]
C[black has to live, of course];W[ne];B[gg];W[fh];B[ke];W[id];B[jd];W[ic]
;B[ie];W[he];B[hf];W[if]
C[if black connects at A...see var.]LB[je:A]
(;B[jf];W[je];B[qi];W[ri];B[ie];W[rd];B[ge]
C[black calculated the ko threats so he makes a very aggressive move here]
;W[je];B[sf];W[pi];B[ie];W[sd];B[hd]
C[black will likely die in the corner, but white's surrounding groups are not quite alive either, and black will get valuable moves on the outside. plus, b destroyed white's area on the upper left.]
;W[gb];B[eg]
C[white's center group is weak];W[di];B[dg];W[dk];B[hb];W[hc];B[gc];W[ib]
;B[fb];W[ha];B[fc];W[bg]
(;B[ch]
C[A is sent, threatening white's group and allowing black to jump into the corner]
LB[ea:A];W[be];B[bh];W[go];B[fo];W[fn];B[eo];W[gm];B[gj];W[gl];B[hk]
(;W[eq]
C[should be at A, to try to reduce black's territory]LB[qq:A];B[gp];W[ho]
;B[hp];W[io];B[jp]
C[black's territory has become very strong in this area];W[kn]
C[now black's];B[jm];W[jo];B[ko];W[lo];B[kp];W[qq]
C[I think this is too late now, because black has gotten so strong on the left]
;B[rq];W[pp];B[rp];W[oq];B[mq];W[mr];B[qr];W[pr];B[pq];W[mp];B[lq];W[qq]
;B[ea];W[ga];B[pq];W[jn];B[ln];W[qq];B[se]
C[sente];W[sb];B[pq];W[fj];B[rk]
C[sente again];W[rj];B[rl];W[sg];B[cb];W[cc];B[cf];W[bf];B[de];W[bb];B[lm]
C[now black is ahead of territory by more than 10 points];W[er];B[fr];W[fs]
;B[gs];W[es];B[hr];W[bj];B[ba];W[db];B[da]
C[this ko is light for black];W[ca];B[do];W[co];B[cb];W[cg];B[dh];W[ca];B[cp]
;W[cq];B[cb];W[ce];B[ee];W[ca];B[bp];W[bq];B[cb];W[ac];B[dd];W[cd];B[em]
;W[dm];B[en];W[el];B[ih];W[ep];B[fp];W[gr];B[gq]
(;W[gk]
C[white cannot connect at A (see var) so must give up center stones, which is why B is 10 points ahead]
LB[hi:A];B[hj];W[ei];B[bi];W[aj];B[ag];W[ca];B[cj];W[ck];B[cb];W[bd];B[ca]
;W[ab];B[ci];W[km];B[kl];W[hi];B[ii];W[hm];B[kd];W[im];B[jl];W[ff];B[fg]
;W[ef];B[fe];W[nl];B[mo];W[ip];B[iq];W[fm];B[dj];W[ej];B[eh];W[fi];B[jc]
;W[jb];B[dn];W[cm];B[ld];W[lc];B[me];W[nh];B[mg];W[ec];B[sj];W[si];B[sk]
;W[ed];B[fd];W[af];B[gf];W[cf];B[ah];W[eb];B[fa];W[bk];B[lp];W[gi];B[ai]
;W[aa])
(;W[hi];B[hj];W[ii];B[fi];W[ei];B[fk];W[fl];B[ej];W[eh];B[dj];W[ci];B[cj]
;W[bi];B[ck]))
(;W[qq]))
(;B[ea];W[ga];B[cb]))
(;B[je];W[ge];B[ig];W[lg];B[kg];W[lh];B[jf]
C[black lives but has to guive up the tail, not a good result]))
(;W[qq]))
(;B[ni];W[nj];B[ok]
(;W[oh]
C[W may be able to fight by extending at A]LB[mj:A];B[mj]
C[leaves bad aji below for B])
(;W[mj])))
(;B[nd];W[nj]
C[normal play]))
(;W[pl];B[ol];W[pm];B[qm];W[qn];B[rn];W[pn];B[qo];W[nm]
C[little bit complicated, so w just plays simply instead]))

