(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[White]PB[Black to play and kill]AW[pq][qq][rq][or][qr][sr][ps]AB[pp][qp][rp][sp][nq][oq][sq][nr][ns]
(;B[os]C[White can live if Black starts here.]
;W[rs]C[This makes the eyes in the corner.]
;B[pr]
;W[qs]C[Two eyes.])
(;B[rs]C[This is the correct play that stops the corner eyes, 
but white can try for the eye on the edge.]
;W[os]
;B[qs]C[But this is atari, killing the group.]))
