(;TR[es]TR[er]TR[eq]TR[cq]TR[dq]TR[bq]TR[aq]AB[ar]AB[as]AB[ds]C[FORCE]AP[goproblems]
(;B[br]TR[es]TR[er]TR[dq]TR[eq]TR[cq]TR[bq]TR[aq]C[FORCE];W[cr]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq])
(;B[cr]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]C[FORCE];W[bs]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]C[FORCE]
(;B[br]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]C[RIGHT])
(;B[dr]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]AW[aq]AW[bq]AW[cq]AW[dq]AW[eq]AW[er]AW[es]C[FORCE];W[br]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq])
(;B[cs]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]AW[aq]AW[bq]AW[cq]AW[dq]AW[eq]AW[er]AW[es]C[FORCE];W[br]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]))
(;B[dr]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]C[FORCE]
(;W[br]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq])
(;W[cr]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq])
(;W[cs]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq])
(;W[bs]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]))
(;B[cs]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]C[FORCE];W[br]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]C[even if black plays in B1, white wins by snapback.])
(;B[bs]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]C[FORCE];W[cr]TR[es]TR[er]TR[eq]TR[dq]TR[cq]TR[bq]TR[aq]C[even if black plays in C1, white can win by snapback.]))