(;GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2] RU[Japanese]SZ[19]KM[0.00] PW[White]PB[Black]AW[co][bp][cp][ep][cq][fq][fr][hr]AB[bq][dq][cr][er][fs]C[Black to move.] (;B[aq]CR[aq] ;W[bs]CR[bs]C[CHOICE] (;B[br]CR[br] ;W[as]CR[as] (;B[eq]CR[eq]C[RIGHT]) (;B[cs]CR[cs] ;W[eq]CR[eq]C[Dead]) (;B[es]CR[es] ;W[eq]CR[eq] ;B[dr]CR[dr] ;W[cs]CR[cs]C[Dead (bent four in corner)])) (;B[cs]CR[cs] ;W[eq]CR[eq]C[Dead]) (;B[ds]CR[ds] ;W[eq]CR[eq]C[Dead]) (;B[as]CR[as] ;W[br]CR[br] ;B[cs]CR[cs] ;W[eq]CR[eq]C[Dead]) (;B[es]CR[es] ;W[br]CR[br]SQ[aq][bq]C[Dead. Marked stones are captured.])) (;B[br]CR[br] ;W[eq]CR[eq]C[Dead]) (;B[ar]CR[ar] ;W[bs]CR[bs] (;B[cs]CR[cs] ;W[eq]CR[eq]C[Dead]) (;B[br]CR[br]C[That doesn't even threaten to live :\\])) (;B[bs]CR[bs] ;W[aq]CR[aq] ;B[ar]CR[ar] ;W[br]CR[br]C[Ko. Black can do better.]))