(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AB[qr][qq][rq][qp][pp][op][np][nq][mr]AW[oq][pq][pr][nr][lr][mq][mp][lo][no][oo][po][qo][ro]C[Black needs two plays to make two eyes in the corner.]
(;B[ps]C[This doesn't help.];W[or];B[rs];W[sr])
(;B[rs];W[sr];B[or];W[os];B[ps]
;W[qs]C[This is a Ko with Balck to find the first threat.])
(;B[or]C[This is the best first play.];W[os];B[ps];W[qs];B[rs]
(;W[sr]
;B[ps]C[This Ko White has to make
the first threat so is the best sequence.])
(;W[ps]C[If White avoids the Ko, 
Black lives.];B[sr])))
