(;SZ[19]AW[ba]AW[ca]AW[db]AW[eb]AW[fb]AW[fc]AW[hc]AW[bd]AW[ed]AW[fd]AW[hd]AW[be]AW[ce]AW[de]AW[bh]AW[eh]AW[bi]AW[ei]AB[da]AB[ea]AB[cb]AB[bc]AB[cc]AB[dc]AB[ec]AB[cd]AB[dd]AB[ee]AB[bf]AB[cf]AB[ef]AB[ff]AB[dg]C[This problem appeared at club. Both players felt Black's dumpling was dead. Prove them wrong.]GM[1]FF[4]CA[UTF-8]AP[CGoban:2]ST[2]RU[Japanese]KM[0.00]
(;B[ad];W[ae]
(;B[df];W[ac])
(;B[bb];W[ac];B[aa];W[af];B[ag];W[bg];B[df];W[ah]C[White escapes, Black is sad.])
(;B[af];W[ac])
(;B[ac];W[ab])
(;B[ab];W[ac]C[Ko favorable for white. Black can do better.]))
(;B[ac];W[af]
(;B[df];W[ag]
(;B[ad];W[ae];B[ah];W[bg]C[That pesky White escapes.])
(;B[ae]C[ It's everybody's favorite pal, Snappy! And by everybody, I mean everybody except for White. Even still, black could have done slightly better.CHOICERIGHT]))
(;B[ae]C[ Poor white and her lack of liberties. Black can do slightly better, however.CHOICERIGHT])
(;B[ag];W[ad]
(;B[df]C[ White likes to donate stones to your cause.CHOICERIGHT])
(;B[bg];W[ab]C[Close, but no banana.])
(;B[ae]TR[ab]C[ It works, but it is not ideal, as it leaves White with an extra Ko threat. She can re-capture the stone as one threat, and then play at the marked point for another.CHOICERIGHT]))
(;B[ad];W[ag]
(;B[df];W[ae]C[White escapes.];B[ah];W[bg]C[That pesky White escapes.])
(;B[ae]C[ Ta-da!CHOICERIGHT])))
(;B[af];W[ac])
(;B[ae];W[ac])
(;B[df];W[ac])
(;B[ab];W[ae];B[af];W[ac];B[ad]C[Ko favors black, but why put yourself in such a position?])
(;B[aa];W[ab]
(;B[ac];W[ad])
(;B[ad];W[ac]))
(;B[fa];W[ac])
(;B[bb];W[ab]
(;B[aa];W[ba]
(;B[ca];W[ac];B[aa];W[ad]
(;B[df];W[ba]C[Ko favors White. Black can do better.])
(;B[ae];W[af]
(;B[ag];W[fa])
(;B[df];W[ba]C[You'd be hard-pressed to find a threat big enough for a White response.])))
(;B[ac];W[ad]
(;B[ca];W[fa]C[Ever have one of those 'oh yeah' moments?])
(;B[aa]C[White is pleased with Ko.])))
(;B[ac];W[ad]C[Whoopsie!])))