(;AB[rs]AB[rr]AB[rq]AB[sr]AW[qs]AW[qr]AW[qq]AW[ns]AW[nq]AB[mr]AB[os]AW[rp]AB[qp]AB[rm]C[kill marked stones]TR[rq]TR[rr]TR[rs]TR[sr]AP[goproblems]
(;W[qo];B[pp];W[so];B[pq];W[sq];B[sp]C[RIGHT])
(;W[ro];B[pq];W[pp];B[qo];W[qn];B[po];W[pr];B[rn])
(;W[pp];B[qo]))