(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AB[qq][pq][nq][pr][mq][lq][op][lr][np]AW[rq][oq][or][nr][mr][pp][qp][rp]C[Black to play]
(;B[ps]C[This is the correct play which allows Black to make use of the corner.]
(;W[qs];B[rr];W[os];B[qr];W[sr]
;B[rs]C[Black's eye wins the capturing race.])
(;W[qr]C[If White plays here first, Black can still use the corner to gain liberties.];B[rr];W[rs]
(;B[ms]C[This wins the capturing race.])
(;B[sr]C[Black should not do this as White has enough liberties to set up the snap-back.];W[os])))
(;B[rr]C[This is not fast enough.];W[ps];B[qr];W[sr])
(;B[qs]C[Nor is this.];W[rr];B[os];W[qr]))
