(;AB[cs]AB[cr]AB[cq]AB[cp]AB[co]AB[bo]AB[ap]AW[bq]AW[ao]AW[an]AW[bn]AW[cn]AW[dn]AW[do]AW[dp]AW[dq]AW[dr]AW[ds]AP[goproblems]
(;B[ar]
(;W[br]C[CHOICE];B[bs]LB[bp:A]LB[aq:B]C[RIGHT])
(;W[bp];B[aq]C[RIGHT])
(;W[aq];B[br];W[bp];B[ap]C[RIGHT]))
(;B[br];W[ar]
(;B[bp];W[bs]LB[aq:A]C[Black cannot play at A];B[as]C[ko])
(;B[bs];W[aq]))
(;B[bp];W[br];B[bs];W[ar])
(;B[aq];W[ar];B[bp];W[br])
(;B[as];W[aq]
(;B[bp];W[br]
(;B[ar];W[bs])
(;B[bs];W[ar]))
(;B[br];W[bp];B[ar];W[ap])
(;B[ar];W[bp];B[br];W[ap]))
(;B[bs];W[aq];B[bp];W[ar]
(;B[as];W[br])
(;B[br];W[as])))