(;AB[rc]AB[rd]AB[re]AB[qf]AB[pe]AB[pd]AB[oc]AB[ob]AB[na]AB[mb]AW[oa]AW[pa]AW[pb]AW[ra]AW[rb]AW[qc]AW[qd]AW[qe]AW[rf]AW[rg]AW[qh]C[How can black capture the white stones in the corner?]AP[goproblems]
(;B[qb];W[qa];B[pc]C[RIGHT])
(;B[pc];W[qb];B[sb];W[pf])
(;B[sb];W[qb];B[pc];W[pf])
(;B[sc];W[pf]))