(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]C[Black to play and kill]AW[pq][pr][ps][qs][lq][mq][kr][nr]AB[rs][rr][qr][qq][pp][rp][op][np][mp][lp][kq][jq][hr][hp][jo]
(;B[ks]C[In this shape this is often a good play];W[ls];B[js]
;W[ns]C[However White can live.])
(;B[or]C[This wedge sometimes works too.];W[oq];B[nq];W[os];B[mr];W[lr];B[ms]
;W[ls]C[However White lives.])
(;B[lr]C[This is the correct first play.]
(;W[ls]
;B[or]C[If white plays this way then the wedge works];W[oq];B[nq];W[mr]
;B[ns]C[Snap-back shape];W[jr];B[js]
(;W[ir];B[is];W[iq];B[hq];W[ip];B[io];W[jp]
;B[kp]C[White cannot escape])
(;W[is]
;B[ir]C[False eye.]))
(;W[mr]C[This White's strongest reply.];B[ns]C[This is the correct next play - the point between two potential eyes.]
(;W[ls];B[or];W[oq];B[nq];W[jr]
;B[js]C[As we have seen White cannot escape here.])
(;W[or];B[ks];W[ls]
;B[js]C[White is dead.])
(;W[oq]C[This does not work either.];B[nq]
(;W[ls];B[or];W[jr];B[js])
(;W[or];B[ks];W[ls];B[js])))))
