(;AB[bq]AB[cq]AB[dp]AB[do]AB[eo]AB[en]AB[em]AB[dm]AB[cn]AB[bn]AW[bo]AW[bm]AW[cl]AW[dl]AW[el]AW[fm]AW[fn]AW[fo]AW[ep]AW[eq]AW[dq]AW[cr]AW[br]TR[bo]AP[goproblems]
(;B[ap]
(;W[ao]C[CHOICE];B[an];W[bp]
(;B[aq]TR[bo]C[RIGHT])
(;B[cp]C[RIGHT])
(;B[co]C[RIGHT]))
(;W[bp];B[aq]C[RIGHT]))
(;B[an];W[ap];B[aq];W[cp];B[co];W[ar]LB[bp:A]C[Black cannot play at A, marked stones are dead]TR[aq]TR[bq]TR[cq];B[bp];W[cp])
(;B[ao];W[ap];B[an];W[aq]LB[bp:A];B[bp];W[cp]))