(;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[ml][nl][ol][mm][om][nn][pn][mo][po][mp][pp][mq][nq][oq]AB[lk][mk][nk][ok][kl][pl][pm][ln][mn][qn][lo][qo][lp][op][qp][lq][pq][qq][lr][nr][or]
(;B[no]C[This is the correct move.]
(;W[oo]C[This is self-atari....]
;B[on])
(;W[np]C[...and so is this]
;B[mr])
(;W[on]
;B[mr]C[This puts white into atari.]
;W[oo]
;B[np]))
(;B[oo]
;W[on]C[White just connects and black can do nothing.]
(;B[no]
;W[np])
(;B[mr]
;W[no])))
