(;AB[bc]AB[bd]AB[be]AB[cd]AB[dd]AB[ed]AB[ec]AB[fb]AW[cc]AW[dc]AW[eb]AW[db]AW[fc]AW[gc]AW[ic]AW[fe]AW[ee]AW[de]AW[ce]AW[cg]AW[bf]C[black to live (ko)nditionally]AP[goproblems]
(;B[ea]
(;W[bb];B[da];W[cb];B[ab];W[gb];B[ba];W[fa])
(;W[gb];B[cb];W[fa]
(;B[ab];W[ca];B[ba]C[black gets a ko only if white makes the mistake of playing at g18])
(;B[ca];W[ab])))
(;B[da];W[bb]
(;B[ba];W[cb];B[ab];W[fa];B[gb];W[hb];B[ca];W[ga])
(;B[fa];W[cb];B[ba]
(;W[gb];B[ab];W[ga])
(;W[ab];B[ea];W[gb];B[ca];W[ga];B[ac];W[aa]))
(;B[ab];W[cb])
(;B[ea];W[cb];B[ab];W[gb];B[ba];W[fa]))
(;B[bb]
(;W[ae]
(;B[cb];W[fa]
(;B[ca];W[ad];B[ac];W[aa];B[af];W[ae];B[ag]C[escaping is not good enough])
(;B[ad];W[ca];B[ba];W[ab])
(;B[ea];W[gb];B[ca];W[ad];B[ac];W[aa]))
(;B[da];W[fa];B[cb];W[gb];B[ad];W[ca];B[ba];W[ab]))
(;W[fa];B[ae];W[ba];B[ca];W[cb];B[aa];W[ac];B[ea];W[gb];B[da];W[ba];B[ca];W[da];B[ba]
(;W[af])
(;W[fd];B[af];W[ag];B[ab];W[ad])))
(;B[cb]
(;W[ca]C[CHOICE]
(;B[bb];W[fa];B[ba];W[ae];B[da];W[gb];B[ad];W[ab])
(;B[ba];W[bb];B[ab]C[ko for lifeRIGHT])
(;B[ab];W[ba]))
(;W[bb]C[CHOICE]
(;B[ba]
(;W[ca]C[CHOICE];B[ab]C[ko for lifeRIGHT])
(;W[ab]C[CHOICE];B[da]C[ko for life];W[ca]C[black gets a ko for lifeRIGHT]))
(;B[ab];W[ba]
(;B[da];W[ca])
(;B[ea];W[ca]))))
(;B[ca];W[cb];B[bb];W[fa]
(;B[ae];W[ac];B[ba];W[ab])
(;B[ba];W[ae]))
(;B[fa];W[bb];B[da];W[cb];B[ab];W[gb];B[ba];W[ga])
(;B[ba];W[ab]
(;B[da]
(;W[ea])
(;W[fa];B[cb];W[gb];B[ae];W[ac];B[bb];W[ea];B[ca];W[fd];B[af];W[ag];B[aa];W[ad]))
(;B[cb];W[fa])
(;B[ac];W[bb];B[da];W[cb];B[fa];W[gb];B[ca];W[ga];B[ea];W[aa]))
(;B[ab];W[bb]
(;B[ba];W[cb]
(;B[fa];W[gb];B[ea])
(;B[gb];W[hb])
(;B[ga];W[gb];B[ea];W[ha];B[da];W[fa]))
(;B[cb];W[ba]
(;B[da];W[ca])
(;B[ea];W[ca]))))
magrock