(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play and kill]AW[pp][oq][qq][rq][or][sr][ps][qs]AB[rn][no][po][qo][op][rp][sp][nq][nr][ns][os]
(;B[pr]C[This is atari, but does not kill.]
;W[pq]
;B[rs]
;W[qr])
(;B[pq]C[This looks like a trick, but White has time to make two eyes.]
;W[pr]
;B[qp]
;W[rr])
(;B[sq]C[White just defends against this.]
;W[rr])
(;B[rs]C[This is the killing move.]
(;W[rr]C[This defence leaves a double atari.]
;B[pr])
(;W[qr]C[This defence now allows the throw-in to work.]
;B[pq]
;W[pr]
;B[qp])
(;W[pr]C[This answer allows Black to use the weakness in the corner.]
;B[rr]
(;W[sq]
;B[qp])
(;W[qp]
;B[sq]))))
