(;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 two stones]AW[rp][qq][rq][or][pr][qs]AB[qo][ro][pp][pq][qr][rr]
(;B[sr]C[Extnding to the 2-1 point is the play that gains liberties for black.]
(;W[sq]C[Too slow]
;B[qp])
(;W[rs]
(;B[sp]
(;W[sq]C[Self-atari])
(;W[ps]C[Not fast enough]
;B[sq]
;W[ss]
;B[qp]))
(;B[sq]C[This way fails]
;W[sp])
(;B[qp]C[This also works.]
;W[ps]
;B[sp]
;W[ss]
;B[sq]))
(;W[ss]C[Also no good]
;B[rs]
;W[sq]
;B[ps]
;W[os]
;B[qp]))
(;B[ss]C[The 1-1 point fails.]
;W[ps]
(;B[sq]
;W[rs])
(;B[sp]
;W[rs])
(;B[sr]
;W[sq]))
(;B[sq]C[Filling a liberty is too slow.]
;W[rs]
;B[sr]
;W[sp])
(;B[qp]C[Same here.]
;W[sr]))
