(;AB[aa]AB[bb]AB[ac]AB[cc]AB[dc]AB[ec]AB[fb]AB[ga]AW[cb]AW[bc]AW[bd]AW[be]AW[cd]AW[dd]AW[ed]AW[fd]AW[fc]AW[gb]AW[hb]AP[goproblems]
(;B[ca]
(;W[db];B[eb];W[ad];B[da];W[ab];B[fa]C[RIGHT])
(;W[eb];B[db];W[fa];B[da]C[RIGHT]))
(;B[db];W[ca]
(;B[da];W[ea];B[ba];W[fa];B[eb];W[fa]C[])
(;B[ea];W[ha];B[da];W[fa]C[Disadv. ko]))
(;B[da];W[ca];B[db]
(;W[ea]C[CHOICE];B[ba];W[fa];B[eb];W[fa])
(;W[fa];B[ea];W[ha])))
