(;AB[rr]AB[qq]AB[qp]AB[qo]AB[pp]AW[qr]AW[pq]AW[oq]AW[nq]AW[op]AW[po]AW[pn]AB[np]AB[no]AB[oo]AB[ol]AW[qk]AW[pj]AW[lq]C[Black to win (play ko only if it is necessary)]AP[goproblems]
(;B[pm];W[qn]
(;B[qm];W[rn]
(;B[rm];W[ro]
(;B[rp];W[sp]
(;B[rq];W[rs]
(;B[sr];W[qs]
(;B[pr];W[or]
(;B[on]C[RIGHT])
(;B[so];W[sn]
(;B[on];W[ps];B[sm]C[RIGHT])
(;B[sm];W[ps];B[on]C[RIGHT]))
(;B[sn];W[so]
(;B[sm];W[ps];B[on]C[RIGHT])
(;B[on];W[sm];B[sl];W[ps])))
(;B[sn];W[ss])
(;B[on];W[ss])
(;B[so];W[ss];B[sq];W[sp]))
(;B[pr];W[ps]
(;B[sr];W[or]
(;B[on]C[RIGHT])
(;B[so];W[sn]
(;B[on];W[qs];B[sm]C[RIGHT])
(;B[sm];W[qs];B[on]C[RIGHT]))
(;B[sn];W[qs];B[on]C[RIGHT]))
(;B[qs])
(;B[or];W[nr]
(;B[sr];W[os]
(;B[on];W[qs]
(;B[sn]C[RIGHT])
(;B[so];W[sn];B[sm]C[RIGHT])
(;B[sq];W[ss]))
(;B[so]
(;W[qs];B[on]C[RIGHT];W[sn];B[sm]C[RIGHT])
(;W[sn]
(;B[on];W[qs];B[sm]C[RIGHT])
(;B[sm];W[qs];B[on]C[RIGHT])))
(;B[sn];W[qs];B[on]C[RIGHT]))
(;B[qs]))))
(;B[pr];W[rq]))
(;B[pr];W[rq];B[qs];W[rp];B[qr];W[sr]
(;B[on];W[or];B[sn];W[os];B[so];W[ps])
(;B[sn];W[or];B[so];W[os];B[sq];W[sp]
(;B[on];W[sm])
(;B[sm];W[ps])))
(;B[rq];W[rs]
(;B[on];W[rp]
(;B[sn];W[sq])
(;B[sr];W[sp]
(;B[sn];W[pr];B[sm];W[qs];B[so]C[RIGHT])
(;B[pr];W[ps];B[sn];W[or];B[sm];W[qs];B[so]C[RIGHT])
(;B[sm];W[sq])))
(;B[pr];W[ps]
(;B[or];W[nr];B[sr];W[os]
(;B[on];W[rp]
(;B[sn];W[qs];B[sp]C[RIGHT])
(;B[sp];W[qs]
(;B[sn]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[so];W[sp];B[sn];W[sm];B[sl];W[sn]))
(;B[sn];W[rp]
(;B[on];W[qs];B[sp]C[RIGHT])
(;B[sp];W[qs]
(;B[on]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[so];W[sp];B[sm];W[qs]
(;B[on]C[RIGHT])
(;B[sq];W[ss])))
(;B[rp];W[qs]
(;B[on];W[sp]
(;B[sn]C[RIGHT])
(;B[so];W[sn];B[sm]C[RIGHT])
(;B[sq];W[ss]))
(;B[so];W[sp];B[on]C[RIGHT])
(;B[sn];W[ss]
(;B[on]C[RIGHT])
(;B[so]C[RIGHT])
(;B[sp]C[RIGHT])))
(;B[so];W[sp];B[rp]
(;W[qs];B[on]C[RIGHT])
(;W[sn]
(;B[on];W[qs])
(;B[sm];W[qs];B[on]C[RIGHT])))
(;B[sp];W[qs];B[rp];W[ss];B[sn]C[RIGHT]))
(;B[sr];W[rp]
(;B[on];W[or]
(;B[sn];W[qs]
(;B[sp]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[sp];W[qs]
(;B[sn]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[so];W[sp]
(;B[sm];W[sn])
(;B[sn];W[sm];B[sn];W[so];B[sl];W[qs];B[sn])))
(;B[sn];W[or]
(;B[sp];W[qs]
(;B[on]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[so];W[qs]
(;B[sp]C[RIGHT])
(;B[on]C[RIGHT]))
(;B[on];W[qs]
(;B[sp]C[RIGHT])
(;B[so]C[RIGHT])))
(;B[sp];W[or]
(;B[on];W[qs]
(;B[sn]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[sn];W[qs]
(;B[on]C[RIGHT])
(;B[so]C[RIGHT]))))
(;B[rp];W[sr]
(;B[on];W[sp])
(;B[sp];W[so]))
(;B[sq];W[sp];B[ss];W[or];B[qs]))
(;B[sr];W[rp]
(;B[pr];W[ps];B[so];W[sp];B[sn];W[sm];B[sn];W[or];B[on];W[so];B[sl];W[qs];B[sn])
(;B[sp];W[qs]
(;B[pr];W[or]
(;B[on];W[ps]
(;B[sn]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[sn];W[ps]
(;B[on]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[so];W[sn]
(;B[on];W[sq];B[sp];W[ps];B[sm]C[RIGHT])
(;B[sq];W[ss])
(;B[sm];W[sq];B[sp];W[ps]
(;B[on]C[RIGHT])
(;B[so];W[sq];B[sp];W[ss]))))
(;B[on];W[ss])
(;B[sn];W[ss])
(;B[so];W[ss]))
(;B[on];W[sp]
(;B[sn];W[pr];B[sm];W[qs];B[so]C[RIGHT])
(;B[pr];W[ps];B[sn];W[or];B[sm];W[qs];B[so]C[RIGHT])
(;B[sm];W[sq]))
(;B[sn];W[pr]
(;B[on];W[qs]
(;B[sp]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[sp];W[qs]
(;B[on]C[RIGHT])
(;B[so]C[RIGHT]))
(;B[so];W[qs]
(;B[sp]C[RIGHT])
(;B[on]C[RIGHT]))))
(;B[sp];W[sr];B[sq];W[rp];B[pr];W[ps];B[ss];W[or];B[sn];W[sr])
(;B[sn];W[so]
(;B[pr];W[ps]
(;B[sm]
(;W[sq];B[sr];W[rp]
(;B[qs];W[lk]LB[mk:A];B[mk];W[qr];B[sp]C[RIGHT])
(;B[sp];W[lk]LB[mk:A];B[mk];W[sq];B[qs]C[RIGHT]))
(;W[sr];B[sp]C[RIGHT]))
(;B[on];W[sm]
(;B[sp];W[sl];B[rp];W[sn];B[rl];W[sk];B[rk];W[sj])
(;B[rl];W[sr];B[sp];W[or];B[sl];W[qs];B[sn];W[mj]LB[nj:A];B[nj];W[sm])))
(;B[sq];W[pr];B[sm];W[qs];B[on];W[sr])
(;B[sm]
(;W[sr]C[CHOICE];B[sp]C[RIGHT])
(;W[sq]C[CHOICE]
(;B[sr];W[rp];B[pr];W[ps]
(;B[qs];W[lk]LB[mk:A];B[mk];W[qr];B[sp]C[RIGHT])
(;B[sp];W[lk]LB[mk:A];B[mk];W[sq];B[qs]C[RIGHT]))
(;B[pr];W[ps];B[sr];W[rp]))))))
(;B[ro];W[rm];B[rl];W[ql];B[rk];W[rj];B[on];W[sl]))
(;B[rn];W[qm];B[ql];W[rl];B[rm];W[pl]))
(;B[qn];W[pm];B[pl];W[qm];B[ql];W[rl];B[rm];W[rn];B[rk];W[sm];B[qj];W[ro]
(;B[rp];W[sp];B[rq];W[pr];B[so];W[sn];B[on];W[rs];B[om];W[rm]
(;B[sk];W[sr])
(;B[sr];W[qs];B[sk];W[ss]))
(;B[pr];W[qs];B[ps];W[rq];B[rs];W[qr];B[qs];W[rp];B[qr];W[or];B[sr];W[os];B[sq];W[sp]))
(;B[qm];W[pm];B[pl];W[qn];B[rn];W[rm]
(;B[on];W[ql])
(;B[ql];W[ro];B[on];W[sn];B[om];W[rn]
(;B[rl];W[rq])
(;B[rp];W[sp];B[rq];W[pr];B[rl];W[rs];B[sl];W[sr])))
(;B[ql];W[qm]
(;B[rl];W[pl])
(;B[pl];W[rl];B[rm];W[rn];B[rk];W[sm]))
(;B[pl];W[qm];B[ql];W[rl]
(;B[rm];W[rn];B[rk];W[sm])
(;B[rk];W[rn];B[sl];W[rm];B[rj]))
(;B[rm];W[qm])
(;B[on];W[qm];B[pm];W[qn];B[ql];W[rl];B[rm];W[pl];B[rn];W[om])
(;B[pr];W[qn]
(;B[rn];W[rm];B[ro];W[ql])
(;B[qm];W[pm];B[pl];W[ql];B[rm];W[rn];B[ro];W[sm])))