(;AP[goproblems]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](;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]TR[aq]TR[bq]TR[cq]C[Black cannot play at A, marked stones are dead];B[bp];W[cp])(;B[ao];W[ap];B[an];W[aq]LB[bp:A];B[bp];W[cp])(;B[bp];W[an](;B[ap];W[ao])(;B[co];W[ao]))(;B[co];W[an](;B[ap];W[ao])(;B[bp];W[ao]))(;B[cp];W[an]))