(;AW[qr]AW[pr]AW[or]AW[os]AW[oq]AW[rp]AW[qn]AW[pn]AW[rn]AW[rm]AW[sm]AB[sl]AB[rl]AB[ql]AB[qm]AB[pm]AB[om]AB[on]AB[oo]AB[op]AB[pp]AB[pq]AB[np]AB[nq]AB[nr]AB[ns]AP[goproblems]
(;B[rq];W[rr]
(;B[so]
(;W[qq];B[ro]C[white can choose to make a ko, see variationRIGHT])
(;W[ro];B[qq];W[sq];B[sr]C[koRIGHT]))
(;B[ro];W[qo]
(;B[qp];W[so])
(;B[so];W[qp];B[qq];W[sq])))
(;B[ro];W[qo];B[rq];W[rr]
(;B[qp];W[so])
(;B[so];W[qp];B[qq];W[sq])))
