(;AB[qr]AB[qq]AB[rq]AB[rp]AW[pq]AW[pr]AW[nq]AW[nr]AW[qp]AW[qo]AW[qn]AW[rm]AB[pp]AB[op]C[Black to live. Assume that the rest of the board is empty. Avoid seki.]AB[oo]AW[po]AW[rl]AP[goproblems]
(;B[ro]
(;W[sr]
(;B[sq];W[so];B[rn];W[sn];B[qm];W[pn];B[pm];W[on];B[nn];W[om];B[ol]C[Ladder.RIGHT])
(;B[rn];W[qm]
(;B[sq];W[sn];B[so];W[rs];B[qs];W[ps]C[RIGHT])
(;B[sn];W[rs];B[qs];W[sq];B[sp];W[ps]
(;B[rr];W[sm];B[ss]C[RIGHT]))
(;B[rs];W[sn];B[so];W[sq]))
(;B[so];W[sq];B[rn];W[qm]))
(;W[rn]
(;B[sq];W[so];B[rs];W[sr])
(;B[rs];W[sr]
(;B[sq];W[so])
(;B[so];W[sq]))
(;B[sr]
(;W[rs];B[qs];W[so];B[sp]C[RIGHT])
(;W[so]
(;B[rs]C[RIGHT])
(;B[sp];W[rs];B[qs]C[RIGHT])))))
(;B[sr];W[rs]
(;B[ro];W[qs]
(;B[rn];W[qm];B[sn]C[Black needs to play both S2 and T4 to live....])
(;B[sp]TR[rr]TR[sn]C[Even if White tenuki, she has miai to kill.]))
(;B[qs];W[sp];B[ro];W[so];B[rn];W[sn];B[qm]C[RIGHT]))
(;B[rs];W[sr];B[ro];W[rn]
(;B[sq];W[so])
(;B[so];W[sq]))
(;B[sp];W[sr])
(;B[rr];W[ro]
(;B[ss];W[qs])
(;B[sp];W[sr];B[ss];W[rs];B[qs];W[ss];B[sq];W[ss]))
(;B[so];W[ro];B[sr];W[rs];B[qs];W[sp]))