(;TR[dr]TR[er]TR[es]TR[dq]TR[cq]TR[aq]TR[bq]LB[as:A]LB[br:A]C[The triangles are edges of the board. The 2 marked points A are on one point. There is no komi. And I'll ignore even if you flag down or vote down irregular boards. What is worthless to research irregular go.FORCE]AP[goproblems]
(;B[br]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]AB[as]LB[as:A]LB[br:A]C[FORCE];W[cs]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Seki.RIGHT])
(;B[as]TR[es]TR[dr]TR[er]TR[dq]TR[cq]TR[bq]TR[aq]AB[br]LB[as:A]LB[br:A]C[FORCE];W[cs]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Seki.RIGHT])
(;B[cr]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[FORCE]
(;W[br]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]AW[as]LB[as:A]LB[br:A]C[FORCE]
(;B[cs]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Seki.RIGHT])
(;B[bs]TR[es]TR[dr]TR[er]TR[dq]TR[cq]TR[aq]TR[bq]LB[as:A]LB[br:A]C[Atari.])
(;B[ds]TR[es]TR[er]TR[dr]TR[cq]TR[dq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Atari.]))
(;W[cs]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[FORCE]
(;B[br]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]AB[as]LB[as:A]LB[br:A]C[Seki.RIGHT])
(;B[as]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]AB[br]LB[as:A]LB[br:A]C[Seki.RIGHT])
(;B[ar]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Atari.])
(;B[bs]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Atari.])))
(;B[bs]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[FORCE]
(;W[br]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]AW[as]LB[as:A]LB[br:A]C[FORCE]
(;B[cs]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Seki.RIGHT])
(;B[cr]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Atari.])
(;B[ds]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Atari.]))
(;W[cs]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[FORCE]
(;B[as]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]AB[br]LB[as:A]LB[br:A]C[Seki.RIGHT])
(;B[br]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]AB[as]LB[as:A]LB[br:A]C[Seki.RIGHT])
(;B[ar]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Atari.])
(;B[cr]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[Atari.])))
(;B[cs]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[FORCE];W[br]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]AW[as]LB[as:A]LB[br:A]C[Seki.RIGHT])
(;B[ar]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[White's heaven. White can play except for D1.])
(;B[ds]TR[es]TR[er]TR[dr]TR[dq]TR[cq]TR[bq]TR[aq]LB[as:A]LB[br:A]C[White's heaven. White can play except for A2.]))