(;AP[goproblems]AB[ca]AB[da]AB[cb]AB[cc]AB[bc]AB[ad]AW[be]AW[cd]AW[ce]AW[dd]AW[ed]AW[ec]AW[db]AW[ea]AW[fb]AW[af]AW[cf]C[Black to live.](;B[bd];W[ab](;B[aa];W[bb])(;B[bb];W[aa]))(;B[bb];W[bd](;B[ac];W[aa])(;B[aa];W[ac]))(;B[ba];W[ab])(;B[aa];W[bd](;B[ac];W[bb])(;B[bb];W[ac]))(;B[dc];W[ab](;B[eb];W[fa])(;B[bb];W[aa])(;B[aa];W[ba]))(;B[ab](;W[ba]C[CHOICE];B[bd]C[RIGHT])(;W[bd]C[CHOICE];B[ba]C[RIGHT]))(;B[ae];W[bd](;B[ba];W[ab])(;B[ab];W[ba])))