(;AB[an]AB[bn]AB[cn]AB[co]AB[cp]AB[ep]AB[ar]AB[bs]AW[bo]AW[br]AW[bq]AW[bp]AW[cr]AW[dr]C[Black to kill.]AB[fr]AB[er]AB[fo]AP[goproblems] (;B[ao];W[cs] (;B[aq];W[ap]) (;B[ap];W[aq]) (;B[as]C[RIGHT])) (;B[ap];W[ao] (;B[aq];W[as] (;B[ar];W[aq]) (;B[ds];W[cs]) (;B[cs];W[ds])) (;B[as];W[aq]) (;B[ds];W[cs]) (;B[cs];W[ds])) (;B[aq];W[ao] (;B[ds];W[cs] (;B[ap];W[as]) (;B[as];W[ap];B[ar];W[as];B[bs];W[aq])) (;B[cs];W[ds]) (;B[as];W[cs]C[Bent-four in the corner, but white has too many liberties.])) (;B[as];W[ao] (;B[ds];W[aq]) (;B[cs];W[ds]) (;B[aq];W[cs]C[Bent-four in the corner, but white has too many liberties.])) (;B[cs];W[ds] (;B[as];W[ao]) (;B[aq];W[ao]) (;B[ap];W[ao]) (;B[ao];W[aq])) (;B[ds];W[cs] (;B[aq];W[ap]) (;B[as];W[aq] (;B[ao];W[as]) (;B[as];W[ao])) (;B[ap];W[aq]) (;B[ao];W[aq])))