(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]AW[qn][qo][kp][lp][rp][kq][mq][nq][oq][rq][jr][pr][qr]AB[kn][mn][on][lo][po][mp][np][op][pp][lq][pq][qq][or]
(;B[lr]C[Drawing out this stone does not help]
;W[nr])
(;B[rr]C[Nor does the cut]
;W[nr])
(;B[mr]C[Sometimes the squeeze helps...]
;W[lr]
;B[nr]
;W[lq]
;B[rr]
;W[rs]
;B[sr]
;W[sq]C[... but not here])
(;B[ps]C[This is the tesuji as it threatens the other three moves]
(;W[nr]C[White can play atari but cannot avoid ko]
;B[ns]
(;W[lr]
;B[rr]
;W[os])
(;W[os]))
(;W[qs]C[This white reply just fails without ko]
;B[mr]
;W[lr]
;B[nr]
;W[lq]
;B[rr]
;W[os]
;B[rs])
(;W[rr]C[If white connects, black can still make ko.]
;B[lr]
;W[nr]
;B[ns]
;W[os])))
