(;AB[cb]AB[cc]AB[cd]AB[be]AW[ce]AW[cf]AW[dd]AW[dc]AW[db]AB[bd]AW[bf]AW[bh]AW[fb]AW[ab]AB[ac]AP[goproblems]
(;W[ae];B[bb])
(;W[bb];B[ae]
(;W[ca];B[ba]
(;W[aa];B[bc])
(;W[da];B[bc])
(;W[bc];B[aa]))
(;W[ba];B[ca];W[da];B[bc])
(;W[bc];B[ba]
(;W[af];B[aa])
(;W[da];B[aa])
(;W[ad]C[Ko. White can now wait for the opportune moment to ignore a black ko threat and play a17 to kill the group.RIGHT]))
(;W[da];B[ba];W[af];B[ca])
(;W[af];B[ba]))
(;W[ba];B[bb]
(;W[ae];B[ca])
(;W[ca];B[ae]))
(;W[af];B[bb])
(;W[ca];B[bb]
(;W[ae];B[ba])
(;W[ba];B[ae])))