(;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[ln][mn][nn][on][pn][qn][kp][lp][op][pp][qp][mq][nq][lr][nr][ls][ns]AB[km][lm][mm][nm][om][pm][qm][rm][kn][rn][jo][qo][jp][np][rp][iq][kq][oq][pq][qq][rq][kr][mr][or][ks][os]
(;B[lq]C[This looks like a good first move, as it is atari.]
;W[mp]C[However White can play this atari, which means the
two white stones on the edge can be given up for two eyes
in the middle, or two separate eyes.]
(;B[ms]
;W[no]
(;B[po]
;W[ko])
(;B[ko]
;W[lo]))
(;B[po]
;W[no]
;B[ko]
;W[ms])
(;B[no]
;W[ms]
;B[po]
;W[oo]
;B[ko]
;W[lo]))
(;B[mp]C[This looks likes a clever move, but White easily lives.]
(;W[lq]C[However White shouldn't play here.]
;B[po]
;W[oo]
;B[lo]
;W[ko]C[Self-atari.]
;B[ms])
(;W[no]C[White must play here.]
;B[po]
;W[mo]
(;B[ko]
;W[lq])
(;B[lq]
;W[ko])))
(;B[po]C[This is the correct first move.]
;W[oo]
;B[mp]C[Black must play here next.]
(;W[mo]
;B[lq]
;W[no]
;B[mp]C[Black has to throw in to give White a shortage of liberties.]
(;W[np]
;B[ko]
(;W[ms]
;B[lo])
(;W[lo]
;B[ms]))
(;W[ms]
;B[lo]C[And another throw-in to ruin White.]
(;W[np]
;B[ko])
(;W[ko]
;B[lo])))
(;W[lq]C[If White plays here...]
;B[lo]C[... Black wedges in and all three White moves at the
top are self-atari.])
(;W[ko]
;B[lq]C[This is double-atari.])
(;W[lo]
;B[lq]
;W[ms]
;B[mr])
(;W[no]
;B[lq]
;W[mo]
(;B[lo]C[This is wrong timing.])
(;B[mp]C[This again kills White.]))
(;W[ms]
;B[lq])
(;W[ro]C[Capturing these two at any stage gives a false eye.]
(;B[qo]C[But Black should take the other eyes away as
this gives White an extra liberty.]
;W[lq]
;B[lo]
;W[mo])
(;B[lq]
;W[qo]
;B[ms]))))
