(;AW[pa]AW[na]AW[qb]AW[qc]AW[pc]AW[od]AW[md]AW[nd]AW[ne]AW[nf]AW[rf]AW[lc]AW[kc]AW[jc]AW[jb]AW[le]AW[hc]AB[kb]AB[lb]AB[mb]AB[mc]AB[nc]AB[oc]AB[ob]AB[pb]AB[oe]AB[pe]AB[pd]AB[pf]AB[pg]AW[of]AB[mf]AB[ld]AB[kd]AB[ke]AB[kf]AB[kg]AW[mg]C[Black must capture White's group to save his own at the top.]AP[goproblems];B[nh]
(;W[mh];B[ng];W[lf]
(;B[lg];W[me]
(;B[og];W[mf];B[mi];W[lh]
(;B[ki]C[Pressing at 1 is the correct move. Black catches White in a geta with 11. RIGHT]LB[nh:1]LB[mh:2]LB[ng:3]LB[lf:4]LB[lg:5]LB[me:6]LB[og:7]LB[mf:8]LB[mi:9]LB[lh:10]LB[ki:11])
(;B[kj]C[RIGHT]))
(;B[mi]C[RIGHT]))
(;B[og]
(;W[me]
(;B[lg];W[mf];B[mi];W[lh];B[ki]C[RIGHT])
(;B[mi]C[RIGHT]))
(;W[lg];B[me]C[RIGHT])))
(;W[ng];B[mh];W[oh];B[og]C[If White 2, Black fills in a liberty with 3 and White cannot escape. RIGHT]LB[nh:1]LB[ng:2]LB[mh:3]LB[oh:4]LB[og:5]))