(;GM[1]FF[4]SZ[19]AP[SmartGo:2.5.0.0]CA[gb2312]
GN[WAGC Round 5]
PW[Cheng-Hsun Chen 6d, Chinese Taipei]
PB[Nai San Chan 6d, Hong Kong]
EV[WAGC]RO[5]
DT[2010-05-28]
KM[6.5]
RE[W+R]
US[Transcribed by Chris Garlock]
TM[3600.0]OT[3x30]
SO[www.chinaqiyuan.com]
AN[Michael Redmond 9P]MU[1]
C[2010 WAGC 
Round 5, May 28
Hangzhou, China
Cheng-Hsun Chen 6d, Chinese Taipei
Nai San Chan 6d, Hong Kong
Commentary by Michael Redmond 9P, transcribed by Chris Garlock]
;B[pd];W[dp];B[pq];W[dd];B[fq];W[cn];B[jp];W[qo];B[pl];W[pm]
C[rather unusual move; a very strong fighting-style move. "A" is the move that occurs to me (see var)]
LB[om:A]
(;B[qm];W[om];B[qn];W[op]
C[B13 (marked) would be better at A, because in the following game sequence the cut at "A" becomes a liability]
LB[ql:A]TR[qn];B[oq];W[np];B[mq];W[nq];B[nr];W[mr];B[lr];W[ro]LB[qk:A]
C[Protecting at "A" does not work because of the the variation]
(;B[ms];W[ql];B[qk];W[rl]
C[Because W has efficient shape here, W seems to have a small advantage at this point.]
;B[fc];W[cf];B[db];W[qf];B[nc];W[of];B[rd];W[re]
C[W34 seems a bit greedy. A play at "A" would erase all of B's potential to make shape in the area]
LB[rk:A];B[cc];W[ci];B[ol];W[nm];B[rk];W[rm]
(;B[qh]
C[This might be better played at A; B will be fairly good shape and W will have to be careful]
LB[ph:A];W[oj]
C[Key point];B[oh];W[nh]
(;B[oi];W[ni];B[nj]
C[Maybe the safest move is at A]LB[pj:A];W[pj]
(;B[qi];W[nk];B[ng]
C[Cutting at "A" would be the most severe move; see the variations]LB[og:A]
(;W[mj]
C[W plays safely and misses the more severe move but because he gets so much thickness in the center it's not necessarily bad for W]
;B[og];W[qd];B[qc];W[pe];B[od];W[nf];B[mg];W[mf]
(;B[lf]
C[extending at A is more solid (see var); the cut leaves a weakness]LB[lg:A]
;W[le];B[kf];W[md]
(;B[ke];W[kd];B[lc]
C[This looks like a very unbalanced move, but because of the cut at A, B has too much to worry about, with two groups to handle and no time to mount an attack. ]
LB[rc:A];W[ld];B[kb];W[lg]
C[The game is very complicated: W can cut at A and make a ko to live, and B is a key point to win the potential semeai against the rightside B group. Thus, the marked W group, which might seem weak, is actually fairly strong. 

Because the ladder is good, the cut is very severe. ]
LB[rc:A][rg:B]TR[kd:md][qd][le][pe][re][mf:of][qf];B[mh];W[kg];B[jg];W[li]
;B[pn]
C[B finds a clever way to escape the trap. Although B's three stones are dead locally, B is reducing the marked white stone's liberties and will use that damezumari in combination with the bad aji in the center. ]
TR[nm:pm];W[on]
C[no choice];B[lh]
C[a forced sequence from here];W[kh];B[ki];W[jh];B[lj];W[mi];B[mk];W[nj]
;B[po];W[pp];B[nl]
(;W[lk];B[ml];W[ji];B[pk];W[kl];B[mn];W[ie]
C[so W allows B to escape, and collects his profit in the center. The fight on the right was a complete disaster and lost the game for him. No further comments.]
;B[fe];W[dr];B[fo];W[em];B[ei];W[ef];B[ek];W[dj];B[ej];W[gp];B[fp];W[gn]
;B[go];W[dk];B[ff];W[fg];B[gg];W[fh];B[gh];W[gi];B[hf];W[ig];B[fm];W[fn]
;B[do];W[co];B[en];W[el];B[fi];W[dh];B[hi];W[gj];B[gk];W[hj];B[fl];W[hn]
;B[im];W[kn];B[jm];W[km];B[mm];W[oo];B[mp];W[ho];B[ip];W[gq];B[fr];W[gr]
)
(;W[ml];B[mm];W[lk];B[oo];W[nn];B[no];W[mn];B[mo];W[ln];B[rn];W[pk];B[sm]
;W[ok];B[sl]
C[though this doesn't automatically give B a win, it's a great success and puts him back in the game]
))
(;B[lh];W[mc]LB[rc:A][ic:B]TR[lh]
C[assuming B protects the cut (marked), W can make miai of A and B]))
(;B[lg];W[md];B[lb]
C[Better for B to play this way so as to solidly move out into the center while strengthening the upper right corner]
))
(;W[og]
(;B[mg];W[mj];B[ne];W[rg];B[rh];W[qj];B[rj];W[sh];B[si];W[sg])
(;B[mj];W[li];B[nl];W[ml];B[pk];W[mk];B[lj];W[ok];B[kj];W[lh];B[mm];W[lm]
;B[mn];W[nn]TR[oj:ok][pj][mk:ml][nk]
C[This is the most severe way for W to play (the W stones cannot be captured)]
)))
(;B[ng];W[og];B[qi]
(;W[mj];B[nk];W[mk];B[nl];W[ml];B[pk];W[rg];B[rh];W[si];B[sh];W[sk];B[rj]
;W[sj];B[ri]
C[B is alive because of W's damezumari])
(;W[nk];B[mj];W[li];B[nl];W[ml];B[pk]
(;W[lj];B[mk];W[lk];B[ok];W[mi];B[nk];W[rg];B[rh];W[sk];B[rj])
(;W[mk];B[lj];W[ok];B[kj]
(;W[lm];B[mh];W[mi];B[lh];W[ki];B[ji])
(;W[lh];B[mm];W[lm];B[mn];W[nn])))))
(;B[ni];W[oi];B[ng];W[ph];B[mh];W[pg];B[nf]
C[In this variation B is developing his moyo on the upper side and still has the aji of a cut at A. ]
LB[pi:A]))
(;B[ph];W[nh];B[oj]))
(;B[qk];W[or];B[ms];W[pr];B[qq];W[qr];B[rr];W[rq];B[rp];W[sq];B[sp];W[qp]
;B[sr];W[rq];B[sq];W[pp];B[rq];W[so]))
(;B[om]LB[pn:A][ql:B]
(;W[pn];B[ql];W[op];B[oq];W[mp];B[nq]
C[Because of B's strength in the area, this fight should be playable for B]
)
(;W[ql];B[qk];W[qm];B[pk];W[on];B[nm]
C[I like B's thick shape towards the center])))