(;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[on][pn][qn][no][qo][mp][pp][qp][mq][pq][mr][or]AB[om][pm][qm][mn][nn][rn][mo][ro][lp][rp][lq][qq][lr][pr][rr][ps]
;B[oo]C[The first move is atari so is quite easy to spot.]
(;W[np]
;B[oq]C[This is the trick.]
(;W[nq]C[But white looks like make two eyes after this.]
;B[ns]C[So black has to find another trick to keep white dead. ]
(;W[op]
;B[nr])
(;W[nr]
;B[op]
;W[po]
;B[op]
;W[os]
;B[ms]
;W[ls]
;B[ms])
(;W[ms]
;B[os]
;W[nr]
;B[op]))
(;W[op]
;B[nr]
;W[nq]
;B[ns]C[Still only one eye.])
(;W[ns]
;B[op]C[Atari.]))
(;W[op]
;B[np]
;W[nq]
;B[no]C[Clearly only one eye this way.]))
