(;AB[cd]AB[dd]AB[ed]AB[ec]AB[eb]AW[bd]AW[bc]AB[be]AB[bf]AW[ce]AW[de]AW[cg]AW[dg]AW[bh]AW[ci]C[black to kill marked stones]MA[bd]MA[bc]AP[goproblems] (;B[bb];W[cb] (;B[cc];W[ab] (;B[ba];W[ca] (;B[ad];W[aa];B[bb];W[ba] (;B[ae];W[bg] (;B[ac]C[RIGHT]) (;B[db];W[cf]C[black can't play a17])) (;B[db];W[bg] (;B[da];W[cf];B[ae]C[black can't play a 17]) (;B[ae];W[cf]C[black can't play a 17]))) (;B[ac];W[ad] (;B[ae];W[aa]C[white has 2 eyes]) (;B[db];W[aa]) (;B[da];W[aa])) (;B[db];W[aa];B[ad];W[cf];B[ae];W[bg]C[black can't play a17]) (;B[ae]C[RIGHT])) (;B[ad];W[ba]C[white has 2 eyes!]) (;B[ac];W[ba]C[white has 2 eyes])) (;B[ab];W[cc]TR[cb]TR[cc]TR[bc]TR[bd]MA[be]MA[bf]C[white will win the semaii]) (;B[ba];W[cc]C[white will win the semaii])) (;B[cc];W[bb];B[cb];W[cf];B[ba];W[bg];B[ab];W[ae]C[white wins the semaii]) (;B[cb];W[cf] (;B[cc];W[ae];B[af];W[bg];B[ad];W[ag]) (;B[bb];W[ae];B[af];W[bg];B[ad];W[ag]) (;B[ad];W[bg]C[white will win the semaii])))