(;AP[GOWrite:2.3.44]SZ[19]ST[2]CA[UTF-8]GM[1]FF[4]GC[Most comments from a player a few stones stronger, paraphrased & filtered through Roger's memory.]PB[Black]PM[2]PW[Roger (rhubarb)]DT[2013-06-10 ]BR[probably similar rank]GN[At Belfast Go Club]WR[3-4k KGS]FG[259:]RE[W+R ]
;B[cp]
;W[pp]
;B[dd]
;W[pd]
;B[eq]
;W[cj]
;B[cl]
;W[cf]
;B[ch]
;W[ef]
;B[fc]
;W[di]
;B[nq]
;W[qn]
;B[jp]
(
;W[ek]C[Bad. Strengthening a strong enough group. See variation for better reducing move.]
;B[qi]
(
;W[qf]C[Too timid. See variation.]
;B[ql]
;W[jc]
(
;B[cd]C[See variation.]
(
;W[pq]C[See variation.]
;B[no]
(
;W[mp]C[This is too cramped a space to try to live in. See variation for a better reducing move.]
;B[np]
;W[kp]
;B[jo]
;W[ln]C[And now black's moyo in the bottom left is getting firmer.]
;B[nm]
;W[km]
;B[im]
;W[ik]
;B[jl]
;W[lk]
;B[jk]
;W[jj]
;B[kd]C[See variation.]
;W[jd]
;B[ke]
;W[lb]
;B[je]
;W[hd]
;B[kj]
;W[kk]
;B[ki]
;W[ij]C[Overplay. Just keep running with the other group.]
;B[mh]
;W[pk]
(
;B[pl]C[See variation.]
;W[nk]
;B[pn]
;W[oi]
;B[qo]
;W[qp]
(
;B[ro]C[See variation.]
;W[po]
;B[rn]
;W[on]
;B[nn]
(
;W[ol]C[See variation.]
;B[pm]
;W[om]
(
;B[em]C[See variation. End of comments.]
;W[qk]
;B[rl]
;W[ie]
;B[mc]
;W[lc]
;B[me]
;W[ld]
;B[le]
;W[md]
;B[pc]
;W[qc]
;B[od]
;W[oc]
;B[pe]
;W[qd]
;B[oe]
;W[nf]
;B[ne]
;W[og]
;B[mj]
;W[lj]
;B[mk]
;W[li]
)
(
;B[qk]C[Reverse sente, and necessary.]
)

)
(
;W[om]C[White should play this.]
)

)
(
;B[po]C[Stops white's funny business.]
)

)
(
;B[nk]C[This almost certainly kills the white group to the left. And white's not likely to kill both black stones on the side, so they can be left alone. Playing here probably wins the game.]
)

)
(
;W[eo]
)

)
(
;W[pr]C[Better.]
)

)
(
;C[\[rhubarb's comment\: Black's & white's triangled enclosures mirror each other, sort of, but the circled stones put more pressure on white's enclosure than on black's. Therefore, reinforcing both corners favours white, but attacking both corners favours black, at least in the sense that black's attack would be more severe than white's.\]]PM[2]CR[ef][ql][nq][cf][jc]FG[259:]TR[qn][pp][fc][dd]
;C[Better to attack this corner than to reinforce the other corner. This particular attack may be an overplay, though. Maybe A instead.]B[qq]L[pr]
)

)
(
;W[qg]
;B[ql]C[Now black's group on this side is under real pressure, unlike in the game sequence. Black might have to jump out instead of extending like this.]
)

)
(
;W[eo]
(
;B[gp]
;W[co]
)
(
;B[dn]
;W[fq]
)

)

)