(;SZ[13]AB[bb]AB[cc]AB[dc]AB[ec]AB[fc]AB[fb]AB[fa]AW[da]AW[bc]AW[bd]AW[cd]AW[dd]AW[ed]AW[fd]AW[gd]AW[gc]AW[gb]AW[ga]AP[goproblems]
(;B[db]
(;W[ab]C[CHOICE]
(;B[ba];W[ea];B[ca]C[RIGHT])
(;B[ea];W[ba]
(;B[cb]C[RIGHT];W[aa]C[RIGHT]
(;B[ca]C[RIGHT])
(;B[ac]C[RIGHT])
(;B[he]C[RIGHT]))
(;B[ca];W[cb]))
(;B[ca];W[ba]
(;B[aa]C[ko])
(;B[cb];W[ea]C[])))
(;W[ba];B[ea];W[ab];B[cb]LB[ca:A]C[RIGHT];W[aa]C[RIGHT]
(;B[ca]C[RIGHT])
(;B[ac]C[RIGHT])
(;B[he]C[RIGHT])))
(;B[ca];W[db]
(;B[cb];W[ab]C[])
(;B[ab];W[cb]C[]))
(;B[cb];W[ab]C[])
(;B[ba];W[db];B[ab];W[cb]C[])
(;B[ab];W[cb];B[db];W[ba]))