(;AB[aq]AB[bq]AB[cq]AB[dp]AB[do]AB[dn]AB[dm]AB[cm]AB[bm]AB[am]AW[br]AW[cr]AW[cp]AW[co]AW[cn]AW[dq]AW[eq]AW[ep]AW[eo]AW[en]AW[em]AW[el]AW[dl]AW[cl]AW[bl]AW[al]AP[goproblems]
(;B[ao]
(;W[bn];B[an];W[bp];B[ap]C[RIGHT])
(;W[ar];B[bp]LB[bn:A]LB[bo:B]C[White cannot play A or B.RIGHT]))
(;B[bo];W[bn]))