(;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[mo][no][oo][mp][op][nq][oq][mr][or][pr][ms]AB[mn][nn][on][pn][lo][po][lp][pp][lq][mq][pq][lr][nr][qr][qs]
(;B[os]C[This is the correct move]
(;W[ns]
;B[ps]C[Either black escapes and the eye is false...])
(;W[ps]C[...or white plays into self-atari.]
;B[np]))
(;B[ps]
;W[os]C[White makes two eyes.])
(;B[ls]
;W[ns]
;B[ps]
;W[os]C[Again white makes two eyes.]))
