(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]PB[Black to play and live]AB[qs][qr][rr][rq][rp][pq][oq][nq][nr]AW[rs][qq][qp][ro][so][sp][pp][op][np][mp][mq][mr][os]
(;B[sq]C[This looks like it makes eyes.];W[ss]C[This leaves the corner as just one eye.];B[ns]
;W[pr]C[Howvever after White here it is self-atari for Black on both sides.]
(;B[or];W[ms])
(;B[ps];W[sr]))
(;B[ss]C[This makes a coner eye.];W[sq]C[So White crawls in threatening to take it away.]
(;B[sr]
;W[ns]C[Black does not have time to make the corner eye.])
(;B[ns]
;W[sr]C[This is only one eye.]))
(;B[ns]C[The correct first play is here.]
(;W[sq]C[If White crawls...];B[or]C[...then Black has two ways to live after this.]
(;W[ps];B[sr])
(;W[sr];B[ps]))
(;W[pr]
;B[ps]C[Black does have time to play here this time.])
(;W[sr]C[This is White's trickiest response.];B[sq];W[pr];B[ss]
;W[ms]C[Black has to give up part of the group to live in the corner.])))
