(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AB[ss][qs][qr][rr][rq][qp][pp][po][np][nq][mr][lr]AW[qo][rp][sq][qq][pq][oq][pr][nr][mq][lq][kr][kq][ro][pn][om][qm]C[Black only has two liberties to the left. So if Black fills the outside
liberty then White wins the race.]
(;B[op];W[or];B[ps];W[ms])
(;B[ps]C[This is not fast enough either.];W[or];B[ns];W[ls])
(;B[ns]C[Nor does this.];W[or];B[ps];W[ls])
(;B[or]C[This is the correct first play
that stops White from playing
there.];W[os]
;B[ps]C[Black now plays there and
catches White short of liberties.]
(;W[ls];B[op]
(;W[or])
(;W[ms]
;B[or]C[White can get two but loses the rest.]))
(;W[or];B[op])))
