(;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[qp][rp][pq][pr][qr][rr][qs]AB[oo][qo][ro][so][pp][oq][or][os][ps][rs]
(;B[sp]C[Ths is too easy for White.]
;W[sq])
(;B[sr]C[Sometimes this is a move worth considering.]
;W[sq]
;B[rq]
;W[ss]
;B[sp]
;W[qq]C[However this time White lives.])
(;B[sq]C[This is the correct play]
(;W[rq]C[White can make one eye.]
;B[sr]C[White cannot capture the two black stones.]
(;W[sp]
;B[qq])
(;W[ss]
;B[sp]))
(;W[sr]C[Again only one eye.]
;B[rq])
(;W[sp]C[White can try to cut the stone off.]
;B[rq]
;W[qq]C[However White is short of liberties.]
;B[sr])))
