(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AB[pr][ps][qq][rq][pp][qo][oo][no][mo][lo][ko][kq][jq][jr][lr][ls]
[ms]AW[kr][mr][lq][lp][mp][np][os][oq][or][pq]C[Black to play and kill.]
(;B[nr]C[Incorrect.];W[nq];B[mq]
;W[ns]C[Black cannot save 1 and 3.]
(;B[mr];W[ks];B[mr]
(;W[qr]C[Wrong timing.];B[lr])
(;W[lr]
(;B[ms]
;W[qr]C[White lives.])
(;B[qr]
;W[ms]C[White lives.])))
(;B[ks];W[mr]))
(;B[ks]C[This is the correct play, removing Black's liberty shortge.]
(;W[ns];B[nq];W[qr];B[op];W[qs]
;B[kp]C[Now White is short of liberties.])
(;W[qr]
;B[nr]C[Black here now kills as no liberty shortage.];W[ns];B[mq];W[nq];B[mr])))
