(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[5.50]
PB[Black to play]AW[nn][mo][oo][mp][op][mq][oq][pq][nr][pr][os]AB[mm][nm][ln][on][pn][ko][np][qp][kq][nq][qq][lr][mr][qr][ms][qs]
(;B[mn]
;W[no]C[This is two eyes])
(;B[ns]C[This looks like it makes the second white eye false.]
(;W[no]C[It dies if White takes]
;B[ps]
;W[or])
(;W[or]C[If  White connects it's one eye])
(;W[ps]C[But White can play here which is a ko.]
;B[or]
;W[qk]
;B[rk]
;W[nr]))
(;B[ps]C[So Black must play this side]
;W[ns]
;B[or]C[The other two responses die the same as before,
but this one also dies.]))
