(;GM[1]FF[4]AP[glGo:1.3.1]ST[1]
GN[2007 WAGC Game 4]
SZ[19]KM[6.5]
PW[Costa Rica]WR[2 Dan]PB[N Mitchell]BR[2 Dan]RE[Black wins by 8.5]
C[2007 WAGC Game 4
Black - N Micthell (Ireland)
White - Luis Carvaijo (Costa Rica)]
;B[pd]
;W[cq]
;B[pp]
;W[dd]
;B[dp]
;W[cp]
;B[do]
;W[er]
;B[gp]
;W[bn]
;B[dl]
;W[qn]
;B[ql]
;W[qq]
;B[qp]
;W[pq]
;B[op]
;W[rp]
;B[ro]
;W[rq]
;B[rn]
;W[nq]
;B[fc]
;W[cf]
;B[jd]
;W[eb]C[Move 26 is slow by White - Black seizes the advantage.]
;B[pf]
;W[pb]C[A bit strange - allows Black to increase outside strength (if plays P17 or Q17 for example).]
;B[qc]C[Wrong side - outside at P17 better, or else Q17. Black wanted to chase the White stones but better to seal them in.]
;W[lc]
;B[jc]
;W[nc]C[I think White should jump out instead, perhaps at M15 or N15. After this move 32 at O17 Black can seal in White with a move at M15.]
;B[qb]C[Black misses chance to play M15 and seal in White.]
;W[le]
;B[jf]
;W[lg]
;B[li]
;W[kh]
;B[jj]
;W[ih]
;B[fb]
;W[kb]
;B[dc]
;W[cc]
;B[db]
;W[cb]
;B[ed]
;W[np]C[Important move - a bit dangerous to tenuki after Black move 47 at E16 but White is behind and needs territory somewhere.]
;B[no]
;W[mo]
;B[nn]
;W[mn]
;B[nm]
;W[ip]
;B[hq]
;W[iq]
;B[de]C[This atari sets up approach at C12 to this corner. Alternatively, Black can play atari with cut at C16 and if White extends at D15 a ko arises in the corner after Black B16. Perhaps that would be better for Black to play that way.]
;W[cd]
;B[lp]
;W[ko]
;B[lo]
;W[ln]
;B[kn]
;W[kp]
;B[lm]
;W[mp]
;B[mm]C[Should play P3 first.]
;W[oq]
;B[ch]C[Big point to get before White C11, and has a lot of followup moves against the corner, but P12 is biggertoclose right side.]
;W[dm]
;B[em]
;W[cm]
;B[el]
;W[df]
;B[ef]
;W[og]
;B[of]
;W[ng]
;B[ph]C[Black peep at N14 now instead would be quite serious for White.]
;W[ni]
;B[oj]
;W[oi]
;B[pi]
;W[nj]
;B[be]C[Now Black gets back to take advantage of White's tenuki earlier.]
;W[ce]
;B[bf]
;W[dh]
;B[ci]
;W[ee]
;B[fe]
;W[eg]
;B[ff]
;W[bd]C[Risky - still only 1 eye in the corner, so connecting at G12 is better.]
;B[cg]
;W[dg]
;B[gh]
;W[ae]
;B[bg]
;W[ab]C[Black would play B19 to keep White to one eye, but there's a lot of aji on the outside. As Black is ahead, I decided to seal white in and make him play another move in the corner.]
;B[ei]
;W[ba]C[C19 better.]
;B[jb]
;W[ob]
;B[hn]
;W[im]
;B[in]
;W[jn]
;B[jm]
;W[km]
;B[jl]
;W[hi]
;B[hk]
;W[gj]
;B[gk]
;W[di]
;B[dj]
;W[qo]
;B[qm]C[Bad mistake - Q6 instead solves any problems.]
;W[oo]
;B[on]
;W[po]
;B[bl]
;W[ki]
;B[lj]
;W[kk]
;B[jk]
;W[if]C[White now starts a powerful attacking sequence.]
;B[ie]
;W[hf]
;B[fj]
;W[he]
;B[hd]
;W[gd]
;B[fd]
;W[hc]
;B[id]
;W[ge]
;B[gc]
;W[hb]
;B[ha]C[Probably this move is not necessary - Black can connect out with G13 if needed.]
;W[ne]C[Moves after 142 omitted. White later started a ko at L6 to capture the Black stones around O7, but it's  avery hard ko for White since Black finishes the ko by capturing at K5 which is practically sente.

Black wins by 8.5 points.])
