(;AW[ba]AW[bc]AW[cc]AW[dc]AW[da]AW[eb]AB[fa]AB[fb]AB[fc]AB[ec]AB[dd]AB[cd]AB[bd]AB[ad]AB[bf]AP[goproblems]
(;B[ab];W[ac]
(;B[ea];W[cb]C[Adv. koRIGHT])
(;B[bb];W[cb];B[ea];W[aa];B[db]C[Adv. koRIGHT]))
(;B[ea];W[ab]
(;B[cb];W[db]C[CHOICE])
(;B[db];W[cb]C[CHOICE]))
(;B[cb];W[bb]C[CHOICE])
(;B[ac];W[ab]C[CHOICE]))