(;C[Black to live (no ko)]AB[rr]AB[rp]AB[qq]AB[pq]AB[pp]AB[po]AB[pr]AB[os]AW[or]AW[mr]AW[oq]AW[op]AW[oo]AW[on]AW[pn]AW[qp]AW[qo]AW[ro]AW[sp]AW[qk]AP[goproblems]
(;B[sq];W[rq];B[sr];W[qs];B[ps];W[rs];B[rp];W[so];B[qn];W[rn];B[qm];W[rm]
(;B[ql];W[rl])
(;B[rl];W[ql];B[pm];W[rk]))
(;B[rs];W[sr];B[rq];W[sq]
(;B[qn];W[rn]
(;B[so];W[sn]
(;B[ss]
(;W[so]C[CHOICE];B[qm]C[RIGHT])
(;W[qm]C[CHOICE];B[so];W[sp];B[sq]C[RIGHT]))
(;B[qm];W[rm]
(;B[rl];W[ql];B[ss];W[rk];B[so];W[sp];B[sq]C[RIGHT])
(;B[ql];W[rl];B[ss];W[so])
(;B[ss];W[ql];B[so];W[sp];B[sq]C[RIGHT])))
(;B[ss];W[so];B[qm];W[rm]
(;B[ql];W[rl])
(;B[rl];W[ql]))
(;B[qm];W[rm]
(;B[so];W[sn]
(;B[rl];W[ql])
(;B[ql];W[rl];B[ss];W[so])
(;B[ss];W[ql];B[so];W[sp];B[sq]C[RIGHT]))
(;B[ql];W[rl];B[so];W[sn];B[ss];W[so])
(;B[rl];W[ql]
(;B[so];W[sn];B[ss];W[rk];B[so];W[sp];B[sq]C[RIGHT])
(;B[rk];W[pm]))))
(;B[ss];W[so];B[qn];W[rn];B[qm];W[rm]
(;B[ql];W[rl])
(;B[rl];W[ql]))
(;B[so];W[sn];B[ss];W[so];B[qn];W[qm]))
(;B[qs];W[sr];B[rq];W[sq]
(;B[ss];W[so])
(;B[qn];W[rn];B[so];W[sn];B[ss];W[rs]LB[ss:Ko?]))
(;B[sr];W[qs]
(;B[rs];W[ps])
(;B[ps];W[rs];B[sq];W[so];B[qn];W[rn];B[qm];W[rm]
(;B[ql];W[rl])
(;B[rl];W[ql];B[pm];W[rk])))
(;B[rq]
(;W[qs]C[CHOICE]
(;B[rs];W[ps])
(;B[ps];W[sq]
(;B[sr];W[rs];B[qn];W[rn];B[qm];W[rm];B[so];W[sp])
(;B[rs];W[sr];B[qn];W[rn];B[qm];W[rm];B[so];W[sn];B[ss]C[RIGHT])))
(;W[sq];B[rs])))