(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AB[rr][rq][qp][pp][op][np][mq][lq][kp][kr]AW[lr][mr][nq][oq][pq][qq][qr][ns]C[Black to play and kill]
(;B[or]C[Playing in the eye-space is often correct.];W[ls];B[ps];W[nr];B[qs]
;W[os]C[But White can live here.])
(;B[qs]C[It is this hane that kills here.]
(;W[ps]C[If White here...];B[or]C[... then the placement kills.];W[ls];B[nr])
(;W[ls]C[If White makes this eye...];B[os]C[... Black stops the other eye with this.];W[ps];B[pr];W[or])))
