(;AW[ca]AW[ba]AW[ab]AW[ae]AW[be]AW[ce]AW[de]AW[dd]AW[ec]AW[eb]AW[ea]AB[da]AB[db]AB[cb]AB[bb]AB[ad]AB[bd]AB[cd]C[Kill black.]AP[goproblems]
(;W[cc]
(;B[aa]C[CHOICE]
(;W[bc];B[dc]
(;W[ac]C[Yup.RIGHT])
(;W[ba];B[ac]))
(;W[ba];B[dc]
(;W[bc];B[ac])
(;W[aa];B[bc])
(;W[ac];B[bc])
(;W[ca];B[bc]))
(;W[dc];B[bc];W[ba]C[Yup.RIGHT])
(;W[ac];B[bc])
(;W[ca];B[dc]
(;W[ba];B[bc])
(;W[bc];B[ac])
(;W[ac];B[bc])))
(;B[bc]C[CHOICE]
(;W[dc];B[aa];W[ba]C[Yup.RIGHT])
(;W[ac];B[aa])
(;W[aa];B[dc])))
(;W[bc];B[cc]
(;W[dc];B[aa];W[ba];B[ac])
(;W[ac];B[aa])
(;W[aa];B[ac]))
(;W[dc];B[cc]
(;W[ac];B[aa];W[ba]C[A seki.])
(;W[aa];B[ac])
(;W[bc];B[aa];W[ba];B[ac]))
(;W[ac];B[bc])
(;W[aa];B[ac]))