(;AW[aa]AW[ac]AW[bc]AW[cc]AW[db]AB[dc]AB[ec]AB[fd]AB[gc]AB[cd]AB[bd]AB[ad]AP[goproblems]
(;B[bb];W[cb]
(;B[eb];W[da];B[ba]C[RIGHT])
(;B[ba];W[eb];B[fb];W[ea];B[ca]C[RIGHT];W[da]C[RIGHT]
(;B[fa]C[RIGHT];W[ab]C[RIGHT];B[ba]C[RIGHT])
(;B[ab];W[aa]))
(;B[ea]C[RIGHT])
(;B[gb]C[RIGHT])
(;B[fb]C[RIGHT]))
(;B[eb];W[bb];B[da];W[ca]C[Adv. koCHOICE])
(;B[da];W[eb];B[fb];W[bb]
(;B[ca];W[ea]C[CHOICE])
(;B[ea];W[ca];B[cb];W[db]C[CHOICE]))
(;B[ba];W[bb];B[ab];W[cb];B[aa]
(;W[ca]C[CHOICE]
(;B[aa];W[eb]
(;B[ea];W[fb])
(;B[fb];W[ea]))
(;B[eb];W[aa]))
(;W[eb];B[ea];W[fa];B[fb])))