(;AB[js]AB[hs]AB[ls]AW[jr]AW[ir]AW[hr]AW[kr]AW[lr]AB[fs]AB[ns]AW[gr]AW[fr]AW[mr]AW[nr]AB[es]AB[er]AB[eq]AB[ep]AB[os]AB[or]AB[oq]AB[op]AW[fq]AW[fp]AW[gp]AW[hp]AW[ip]AW[jp]AW[kp]AW[lp]AW[mp]AW[np]AW[nq]AB[oo]AB[no]AB[mo]AB[lo]AB[ko]AB[jo]AB[io]AB[ho]AB[fo]AB[go]AB[eo]TR[gs]TR[is]TR[ks]TR[ms]C[There are 4 triangles. Choose the best move of Black.FORCE]AP[goproblems]
(;B[gs]C[FORCE]
(;W[is]C[FORCE]
(;B[ks]C[FORCE];W[ms])
(;B[ms]C[FORCE];W[ks]C[RIGHT]))
(;W[ks]C[FORCE]
(;B[is]C[FORCE];W[ms]C[RIGHT])
(;B[ms]C[FORCE];W[is]C[RIGHT]))
(;W[ms]C[FORCE]
(;B[is]C[FORCE];W[ks]C[RIGHT])
(;B[ks]C[FORCE];W[is])))
(;B[is]C[FORCE];W[gs])
(;B[ks]C[FORCE];W[ms])
(;B[ms]C[FORCE]
(;W[gs]C[FORCE]
(;B[is]C[FORCE];W[ks])
(;B[ks]C[FORCE];W[is]C[RIGHT]))
(;W[is]C[FORCE]
(;B[gs]C[FORCE];W[ks]C[RIGHT])
(;B[ks]C[FORCE];W[gs]C[RIGHT]))
(;W[ks]C[FORCE]
(;B[gs]C[FORCE];W[is]C[RIGHT])
(;B[is]C[FORCE];W[gs]))))