(;AB[ar]AB[br]AB[bq]AB[cp]AB[dp]AB[ep]AB[fr]AB[fs]AB[ds]AW[gs]AW[gr]AW[fq]AW[fp]AW[fo]AW[eo]AW[do]AW[co]AW[bo]AW[bp]AW[aq]AP[goproblems]
(;W[dr];B[eq]
(;W[er]C[RIGHT])
(;W[cq];B[er];W[cs]C[There is a solution without a ko];B[bs];W[es]C[There is a solution without a ko]))
(;W[eq];B[dr])
(;W[cq];B[dr];W[dq];B[cr];W[eq];B[er])
(;W[er]
(;B[dr]C[CHOICE];W[dq];B[cq];W[eq]C[];B[cs])
(;B[eq];W[dr]C[])))