(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
AW[no][oo][po][mp][pp][mq][pq][qq][mr][ms][ps]AB[nn][on][pn][qn][lo][mo][qo][lp][qp][lq][rq][lr][or][rr][ls]KK[^Bestiary^Snapback]
;B[np]C[THe cut is the key move (but may ber played later)]
;W[nq]
;B[pr]
;W[qr]
(;B[rs]C[this move is the real key stone]
;W[qs]
;B[oq]
;W[os]
;B[ns]C[a very unusual parallel double snapback]
(;W[nr]
;B[ns])
(;W[op]
;B[np]))
(;B[os]BM[1]
(;W[rs]C[this unexpected resistance ends in ko (because of the corner properties)])
(;W[qs]C[of course, if white connects.....]
;B[oq]
;W[op]
;B[rs]
;W[np]
;B[nr]
;W[ns]
;B[or])))