(;AB[ab]AB[aa]AB[ba]AB[bc]AB[cb]AB[cc]AB[cd]AB[db]AB[dd]AB[ed]AB[gb]AB[gc]AB[fd]AW[ac]AW[ad]AW[bd]AW[be]AW[ce]AW[de]AW[ee]AW[fe]AW[gd]AW[hd]AW[ic]AW[hb]AW[ga]AW[da]AW[ea]AW[eb]C[I invented this problem 10 years ago in bed, in total darkness. Black to live.]AW[kc]
(;B[ec]
(;W[ca]
(;B[fb];W[bb]
(;B[fa]
(;W[ba]
(;B[ab]C[Capturing the 3 stones in the corner gained White just one liberty, but White needs two moves to connect!RIGHT])
(;B[ha];W[ab]C[Dead (but only since I added a stone at L17)])
(;B[aa];W[ab])
(;B[ib];W[hc]
(;B[ha];W[ab])
(;B[ab];W[fc]))
(;B[hc];W[fc]))
(;W[ab]
(;B[ba]C[Capturing the 3 stones in the corner gained White just one liberty, but White needs two moves to connect!RIGHT])
(;B[hc];W[fc])
(;B[ha];W[ba])
(;B[fc];W[ba])
(;B[ib];W[ba]
(;B[ha];W[hc])
(;B[hc];W[fc])
(;B[jc];W[ha])
(;B[jb];W[ha])
(;B[ia];W[hc])
(;B[id];W[ha]))))
(;B[ba];W[aa];B[fa]C[];W[ab];B[ba];W[ca]C[Alive, although Black wasted a point with the throw-in at B19.RIGHT])
(;B[ab];W[fa];B[ba];W[ha]C[Black is alive, but White should not be allowed to escape having played c19.])
(;B[aa];W[ab]LB[ba:A]C[Black can't play at A so White is connected.])
(;B[hc];W[fa])
(;B[ib];W[hc]))
(;B[bb];W[fa])
(;B[fc];W[bb])
(;B[fa];W[fb]
(;B[fc];W[bb])
(;B[bb];W[hc]C[Black cannot connect.]))
(;B[hc];W[fb];B[fc];W[bb]))
(;W[fa];B[ca]C[Life is easy after the best move from White.RIGHT]))
(;B[ca];W[ec]C[Only one eye and no way to capture White.])
(;B[fb];W[ec]
(;B[fa];W[fc]C[Whoops, neatly captured by White...])
(;B[fc];W[fa])
(;B[ca];W[hc])
(;B[dc];W[fa])
(;B[ha];W[ia])
(;B[hc];W[fc]))
(;B[fa];W[fb]
(;B[ec];W[ca]
(;B[fc];W[bb])
(;B[bb];W[hc]C[Black cannot connect.]))
(;B[ca];W[ec];B[fc];W[hc])
(;B[fc];W[ca]
(;B[bb];W[hc]TR[ec]C[The marked move would put Black in atari.])
(;B[ec];W[bb]))
(;B[ha];W[ca]
(;B[bb];W[ia]
(;B[ec];W[hc])
(;B[fc];W[hc]))
(;B[fa];W[bb]C[Black can't get two eyes.])
(;B[fc];W[ia])
(;B[ec];W[ia]))
(;B[ib];W[hc]LB[ca:A]LB[ec:B]C[A and B are now miai for White.]))
(;B[dc];W[ca])
(;B[fc];W[ca]
(;B[bb];W[fa])
(;B[fa];W[fb]
(;B[bb];W[hc]TR[ec]C[The marked move would put Black in atari.])
(;B[ec]))
(;B[ec];W[bb])
(;B[fb];W[fa])
(;B[hc];W[ib]
(;B[ec];W[fa])
(;B[fa];W[fb]
(;B[ec];W[bb])
(;B[bb]MA[ec]C[Black E17 would be self-atari.]))
(;B[bb];W[fa])
(;B[fb];W[fa])))
(;B[hc];W[ib]
(;B[ec];W[ca];B[fb];W[bb])
(;B[ca];W[ec]
(;B[fb];W[fa])
(;B[fa];W[fb])
(;B[fc];W[fa]C[F19 isn't even necessary; it just shows Black is dead and reduces variations]))
(;B[fb];W[ec])
(;B[fc];W[ec])
(;B[fa];W[fb]
(;B[ec];W[ca];B[fc];W[bb])
(;B[fc];W[ca]
(;B[ec];W[bb])
(;B[bb]MA[ec]C[Black E17 would be self-atari.]))))
(;B[ha];W[ca]
(;B[ec];W[bb])
(;B[bb];W[fa])
(;B[fb];W[bb])
(;B[fa];W[bb])))
BartTM