(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]RU[Japanese]SZ[19]KM[0.00]PW[white]PB[Black]AW[ba][ra][bb][rb][sb][bc][qc][bd][rd][be]AB[cb][pb][qb][cc][pc][cd][pd][ce][qe][re][cf][cg][bh][dh]C[can black kill the left white group ? How many moves can kill the right group ? Which one is better ?](;B[ab];W[bf];B[af];W[ae];B[ac])(;B[se]C[there are 4 way to kill white but this is the best move because black does not have any problem from outside now];W[sd];B[rc]))