(;AB[rr]AW[qr]AW[pr]AW[or]AW[rq]AW[rp]AB[nq]AB[nr]AB[oq]AB[qq]AB[qp]AB[ro]AW[sr]AB[qo]C[Shikawara-Sensei showed this sequence in volume 1 of Hikaru no Go. Black to kill]AP[goproblems]
(;B[rs];W[qs]
(;B[sp];W[ss]
(;B[os]C[Dead =DRIGHT])
(;B[rr];W[rs]
(;B[os]C[RIGHT])
(;B[so];W[os];B[sq]C[RIGHT]))
(;B[sq];W[so];B[sp];W[os];B[sn];W[sq])
(;B[so];W[os];B[rr]C[Dead!RIGHT]))
(;B[os];W[sp]
(;B[so];W[ss])
(;B[pq];W[ss]))
(;B[so];W[ss]
(;B[sp];W[sq];B[os]C[RIGHT])
(;B[rr];W[rs];B[sp]C[RIGHT];W[os];B[sq]C[RIGHT])
(;B[os];W[sp])))
(;B[sp];W[rs]
(;B[so];W[sq])
(;B[os];W[ps]
(;B[so];W[sq])
(;B[ns])))
(;B[os];W[rs]))