(;AP[goproblems]AW[ar]AW[br]AW[cr]AW[cq]AW[dq]AW[er]AW[ds]AB[bq]AB[bp]AB[cp]AB[ep]AB[eq]AB[fr]AB[fs]AB[gq]AB[cs]AB[dp](;B[bs];W[as](;B[es]C[RIGHT])(;B[cs];W[bs];B[es]C[RIGHT]))(;B[es];W[bs];B[dr]C[Only ko, black can kill unconditionally.])(;B[aq];W[bs];B[es];W[dr])(;B[as];W[bs]))