(;AB[as]AW[br]AW[bq]AW[cr]AW[cs]AW[bo]AW[cn]AW[bn]AW[an]AB[am]AB[bm]AB[cm]AB[dm]AB[dn]AB[do]AB[dp]AB[dq]AB[ds]AB[dr]AW[aq]C[Black can't kill White but has the best result.]AP[goproblems]
(;B[ao];W[bp])
(;B[ap];W[cp]
(;B[co];W[cq])
(;B[cq];W[co]))
(;B[bp];W[cp]
(;B[co];W[ap];B[cq];W[bp]C[RIGHT])
(;B[cq];W[ap];B[co];W[bp]C[RIGHT]))
(;B[co];W[cp];B[cq];W[bp])
(;B[cp];W[bp]C[RIGHT])
(;B[cq];W[cp];B[co];W[bp]))