(;AB[bc]AB[cc]AB[db]AB[fb]AB[fc]AW[bd]AW[dd]AW[cd]AW[ed]AW[fd]AW[gd]AW[gb]AW[hc]AW[ga]AW[cf]AW[fa]C[Black to live.]AP[goproblems]
(;B[ca];W[ea]
(;B[bb];W[ac];B[ab];W[dc];B[da]C[Well done !RIGHT])
(;B[ab];W[ba];B[bb];W[da]
(;B[aa];W[dc])
(;B[dc];W[cb]C[Unconditional life was possible]))
(;B[ba];W[ab]TR[bb]TR[ac]))
(;B[ab];W[ba]
(;B[ca];W[ea];B[bb];W[da]
(;B[aa];W[dc])
(;B[dc];W[cb]C[Unconditional life was possible]))
(;B[bb];W[ca]))
(;B[ba];W[ab]
(;B[bb];W[ac];B[ea];W[ca]C[There is no eye at E18])
(;B[ac];W[da];B[ca];W[ea];B[bb];W[dc]))
(;B[bb];W[ca]
(;B[ea];W[da];B[eb];W[ac];B[ab];W[ba])
(;B[da];W[ac];B[ab];W[ba]))
(;B[ea];W[ca]
(;B[ba];W[bb];B[ab];W[aa]C[Unconditional life was possible])
(;B[bb];W[da];B[eb];W[ac];B[ab];W[ba])))