(;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[mq][nq][oq][lr][mr][pr][qr][ns]AB[po][mp][np][op][kq][lq][pq][qq][kr][nr][rr][rs]C[First look at the obvious lines]
(;B[qs]
;W[or]
(;B[ls]
;W[ps]C[OK])
(;B[ps]
;W[ls]C[OK]))
(;B[ps]
;W[or]
;B[qs]
;W[ls]C[OK])
(;B[ls]
;W[or]
;B[qs]
;W[ps]C[OK])
(;B[os]
;W[or]
;B[qs]
;W[ps]C[OK])
(;B[or]C[So this must be the tesuji.]
(;W[os]
;B[or]C[The throw in is the killer move.]
(;W[nr]
;B[qs]
(;W[ls]
;B[ps]C[Only one eye])
(;W[ps]
;B[ls]))
(;W[ls]
;B[ps]C[snap back shape]))
(;W[ps]
;B[ls]C[Also only one eye.])
(;W[ls]
;B[ps]
;W[os]
;B[or]C[Snap back shape again.])))
