(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AB[np][nq][nr][ns][os][oo][po][qo][ro][sp]AW[or][oq][op][pp][ps][qr][sr]C[Black to play and kill.]
(;B[rs]C[The looks like the point to stop the eyes of the edge...];W[qq];B[pr]
;W[qs]C[.. but White leives easily.])
(;B[qq]C[This is the play to remove the eye on the left...];W[rs]C[... but White makes the edge eyes.])
(;B[pr]C[So the throw-in here is the correct first play.];W[pq]
;B[rs]C[Then Black attacks the edge eyes.]
(;W[rq]
;B[qp]C[This exchange doesn't help.];W[qq];B[qs];W[rr]
;B[pr]C[Black can start the Ko to kill White.])
(;W[qq]
;B[qs]C[The sequence continues as before.])))
