(;AP[goproblems]AB[ab]AW[bc]AW[bd]AW[ad]AW[cc]AW[dc]AW[ea]AW[eb]AW[da]AB[fa]AB[fb]AB[fc]AB[ec]AB[dd]AB[cd]AB[be]AB[cf](;B[ba];W[bb];B[ca];W[db]C[CHOICE])(;B[ca];W[db](;B[bb];W[cb];B[ba]C[RIGHT])(;B[ba];W[bb];B[ae];W[ee](;B[ac];W[aa];B[ab];W[fe];B[cb];W[aa];B[ba];W[ca])(;B[aa]C[seki, Black can kill the white group]))(;B[cb];W[bb])(;B[ac];W[ba])(;B[ae];W[ba]))(;B[bb];W[cb];B[ba];W[ac];B[ae]C[CHOICE])(;B[cb];W[bb](;B[ba];W[db]C[CHOICE])(;B[ca](;W[ba];B[db])(;W[db]C[CHOICE];B[ae];W[ba]))))