(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play and rescue 3 stones]AW[op][pp][nq][qq][rq][nr][qr][sr][qs]AB[qn][qp][rp][sp][pq][sq][or][pr][rr]C[Black to play and rescue 3 stones]
(;B[ps]C[If black plays this atari...]
;W[rs]C[...White simply makes two eyes in the corner.])
(;B[ss]C[If black captures...]
;W[os]
(;B[rs]C[This is self atari])
(;B[sr]
;W[ps]C[White wins the race]))
(;B[rs]C[So black must sacrifice a second stone and make use of the special property of the corner.]
;W[ss]C[White must take.]
(;B[rs]C[Black plays back inside]
(;W[rr]
;B[ps]C[White loses the race])
(;W[os]C[White should play here as it seals off the left.]
;B[rr]
;W[ps]C[But white should not play here as this is self-atari]
;B[ns]))
(;B[rr]C[This inside move gives the same result.]
;W[rs]
;B[ps])))
