(;GM[1]FF[4]SZ[19]AP[SmartGo:2.5.0.0]CA[gb2312]
GN[WAGC RD 4]
PW[Fernando Aguilar 7d, Mexico]
PB[Cheng-Hsun Chen 6d, Chinese Taipei]
EV[WAGC]RO[4]
DT[May 27 2010]
PC[Hangzhou China]
KM[6.5]
RE[B+ 7.5]
US[transcribed by Chris Garlock]
TM[3600.0]OT[3x30]
SO[www.chinaqiyuan.com]
AN[Michael Redmond]MU[1];B[pd];W[dd];B[pq];W[dp];B[fq];W[cn];B[jp];W[qk]
C[The game move or A are the most common moves; B is possible but unusual]
LB[qn:A][qf:B];B[qm];W[qh]
(;B[qf];W[qo]
C[This is the weak point of B's extension; it's aggressive and gives B a difficult choice. The stubborn response, in keeping with B's original idea of attacking with the marked stone, is the kosumi at A (see var).]
LB[pn:A]TR[qf]
(;B[po]
C[This is a more normal way of playing. It's not the way I would play but it's feasible, because the marked attacking move also works as a territorial move ]
TR[qf];W[qn];B[pn];W[rm]
(;B[pm]
C[I don't like B17; the W group is already alive, so it's not necessary to save this stone. See the variation to see how B can move quickly to develop the lower side moyo instead. ]
;W[rl];B[qp];W[rp];B[rq];W[hq];B[hp]
(;W[ip]
C[Extending at A is also possible]LB[iq:A];B[iq];W[io];B[hr];W[jq];B[gq]
;W[ir]
C[now it would be too submissive for B to connect; the ladder is good for W and B doesn't have a good ladder break]
(;B[kq];W[hq];B[dq];W[iq];B[cq];W[dj]
C[this is probably an even trade];B[fc];W[hc];B[cf];W[fd]
(;B[gd];W[gc];B[cd];W[cc];B[ed];W[fe];B[dc];W[de];B[ee];W[ef];B[ec];W[df]
;B[ff];W[ge];B[ce];W[dh];B[cb];W[bc];B[bb];W[cg];B[bg];W[bh];B[af];W[he]
C[This is a fairly old joseki -- not as popular recently, I'm not sure why -- and now the game hinges on how much of a moyo W can get in the center. ]
;B[oc];W[fo];B[ci];W[ch];B[kr]
C[Black's being just a little greedy here, taking all of his territory before going into W's moyo. But it's understandable, because it's hard to find the right point to invade. ]
(;W[jk]LB[lo:A]
C[This is fairly straightforward but the problem is that it's one-purpose. I prefer a play at A, which both threatens the marked stones and expands the center.]
TR[jp][kq:kr];B[jm]
C[standard probing move, setting up B's next move];W[im];B[ji]
C[In some cases B will be looking at playing at A to connect up to B73]LB[jl:A]
;W[jn]LB[jl:A]
C[Protecting at A would be more effective at attacking the center stone]
TR[ji];B[hi]
C[Now the game is becoming difficult for W because B has sufficiently reduced W's moyo and maintains his territorial lead. So the only way for W to salvage a winnable game is to attack B's central group severely enough to activate the aji at the 3-3. "A" takes a long-term approach, hoping to take the game into a close endgame; B is a more aggressive, powerful move, playing with the hope to kill B's center but also to gain points by attacking (I would lean towards B myself); C is too defensive and just doesn't get enough territory to win the game.]
TR[qc]LB[mc:A][li:B][gj:C];W[gj];B[bo]
C[this is pretty big; W would like to ignore it and commence the attack on the center, but perhaps W misjudged the situation and thought he had enough territory.]
;W[bn];B[kd];W[kf];B[li]
C[Nice order of moves for B, taking the sides and then easily running away in the center.]
;W[kh];B[ki];W[lk];B[mg]
C[With W's chance to attack B's center group now gone, the game is heading toward the endgame and B has about a 10-point territoritorial lead. ]
;W[rf];B[re];W[pf];B[qg];W[pg];B[ph]
C[B can counter-attack now that the pressure on his center group has eased. ]
;W[oh];B[pi];W[oi];B[pj]
C[Now the tables have turned and it's W who's under attack. After this, B is in control of the game and takes a safe route to victory. No further comments]
;W[oj];B[pk];W[rg];B[qe];W[qi];B[mj];W[ok];B[ol];W[mf];B[nf];W[ng];B[nh]
;W[og];B[lg];W[lf];B[ne];W[mk];B[jf];W[mi];B[jg];W[kc];B[jc];W[je];B[ke]
;W[jd];B[lc];W[kb];B[md];W[jb];B[co];W[do];B[hj];W[hk];B[gi];W[fj];B[go]
;W[op];B[ro];W[rn];B[nl];W[lj];B[lo];W[mn];B[mo];W[so];B[pp];W[gn];B[gb]
;W[ao];B[bp];W[mb];B[hb];W[ib];B[nb];W[mc];B[nc];W[lb];B[ld];W[ln];B[ko]
;W[kn];B[rh];W[ri];B[sf];W[sh];B[gr];W[sq];B[rr];W[hg];B[mh];W[ih];B[ni]
;W[qj];B[pl];W[jh];B[kg];W[ii];B[nk];W[ha];B[fb];W[nn];B[no];W[sr];B[if]
;W[hf];B[ap];W[an];B[ml];W[ll];B[jj];W[ij];B[gp];W[ep];B[eq];W[ho];B[on]
;W[rs];B[qr];W[ah];B[bd];W[ag];B[bf];W[jo];B[kp];W[ie];B[nj];W[na];B[oa]
;W[ma];B[fp];W[en];B[ga];W[ia];B[mm];W[lm];B[kj];W[kk];B[lh];W[cp];B[bq]
;W[hs];B[gs];W[is];B[js];W[jr];B[ks];W[nm];B[qs];W[sp];B[se];W[sg];B[ss]
;W[pb];B[ob];W[rs];B[si];W[sj];B[ss];W[ql];B[rs];W[ig];B[om]
C[WAGC RD 4
Hangzhou China
W: Fernando Aguilar 7d, Mexico
B: Cheng-Hsun Chen 6d, Chinese Taipei]
)
(;W[lo]
C[locally this is an overplay, because B can counterattack (see var), but W can then solidify the moyo naturally]
(;B[jj];W[op];B[pp];W[mq])
(;B[ko];W[kn];B[ln];W[km];B[mn];W[kj])))
(;B[cc];W[cd];B[dc];W[ec];B[eb];W[ed];B[fb];W[bd]
C[playable for W but I prefer the game variation, which tries to take the left side.]
))
(;B[hq];W[kp];B[pi];W[qi]
C[doesn't change the ladder]))
(;W[iq];B[ip];W[jq];B[gq];W[lq];B[kq];W[kr];B[kp];W[mr];B[cq]
(;W[dq];B[cp];W[co];B[dr];W[er];B[cr]TR[dq];W[eq];B[hr];W[is];B[ir];W[jr]
;B[fr])
(;W[ck];B[cp])))
(;B[qp];W[pm];B[fo]))
(;B[pn];W[qq];B[op]
C[This is the move that I chose in a game, as well.];W[po];B[oo];W[qr]
C[In this variation, B has a cutting point at A, which will hamper his attack on the W side group]
LB[on:A]))
(;B[mc];W[qo];B[po];W[qn];B[pn];W[rm];B[qp];W[pm];B[fo]
C[If B played at A, W's invasion at B is less effective because B has already abandoned the attack on the right side and in return has taken profit on the upper side. ]
LB[mc:A][qo:B]))