(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AW[qs][rr][or][oq][nr][mr][pp][qp][rp][sp][pn]AB[ps][pr][pq][qq][rq][sq][op][np][nq][lr][lq][lo]C[Black to play and live]
(;B[ms]C[Black need to capture the four white stones to escape];W[sr]C[Hoever White plays here and Black is short of liberties]
(;B[os];W[qr])
(;B[mq];W[qr])
(;B[rs];W[os]))
(;B[rs]C[This is the key play]
(;W[ss];B[ms];W[sr]
;B[mq]C[Now it is White that is short of liberties])
(;W[os]
;B[qr]C[This is two eyes])))
