(;AB[cc]AB[cb]AB[ca]AW[ba]AW[bb]AB[bc]AW[ac]AW[bd]AW[cd]AB[dd]AB[ec]AW[de]AB[ee]AB[ef]AW[df]AW[cf]AW[bf]AW[af]AW[be]AB[dg]AB[cg]AB[bg]AB[ag]AP[goproblems]
(;B[ad];W[ae];B[ab]TR[ce]C[White has only one eye. Even if white captures A18, white still has only one eye. So black needn't recapture with bA18 (snapback) unless black needs to prevent white from escaping.RIGHT])
(;B[ab];W[ad]))