(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AB[rs][rq][qr][pq][oq][nq][mp][lp][lq][lr]AW[mq][mr][nr][np][op][pp][qp][qq][rp][rr][sr]C[Black to play.]
(;B[pr]C[This fails.];W[os];B[ms]
;W[ps]C[Black runs short of liberties.];B[qs]C[Connecting here does not help.];W[sq])
(;B[os]C[This is the correct play.]
(;W[pr];B[or]
;W[qs]L[ms]C[The best White can do is save the corner. Black doesn't yet need to play at A.])
(;W[or]C[This way White runs out of liberties.];B[pr];W[qs];B[ps])))
