(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AB[pr][pq][pp][op][nq][qq][ro][qn][on][mn][kq][kp][lo][iq][gq]AW[ps][or][oq][np][mp][qr][rp][rq][rr][rs][lq]C[White has a corner eye so Black needs to stop one forming around the isolated stone.]
(;B[nr];W[os];B[ns]
;W[qs]C[These moves are forcing, but can Black escape?]
(;B[ks]C[This is normally the trick in this shape.]
(;W[ms]C[White can try this.];B[mr];W[lr];B[ls];W[mq];B[ms]
;W[kr]C[In this case Black is caught.])
(;W[lr]C[This also traps Black.];B[ls];W[ms];B[mr];W[mq];B[ms];W[kr]))
(;B[lr]C[Black can try this, but it fails with shortage of liberties.];W[mr]
(;B[mq];W[ms])
(;B[ms];W[mq];B[ls];W[kr]))
(;B[kr]C[This fails too.];W[lr];B[ls];W[ms];B[mr];W[mq]))
(;B[mr]C[Playing this way fails to escape too.];W[lr])
(;B[ks]C[The correct play here is to make the connecting move first.]
(;W[mr]C[White can try this.];B[nr];W[os];B[ns];W[qs];B[ms];W[mq];B[ls];W[kr];B[jr];W[lr]
;B[js]C[Black escapes.])
(;W[lr]C[This also looks like it disconnects...]
(;B[nr];W[os];B[ns];W[qs];B[ls];W[ms];B[mr];W[mq];B[ms]
;W[kr]C[.. and playing this way it does.])
(;B[ls]C[...but Black plays here]
(;W[ms]C[If White tries to block the white stones run short of liberties.];B[ns]
(;W[mr]
;B[nr]C[White dies.];W[os];B[qs])
(;W[nr];B[mr];W[mq]
;B[ms]C[This way the eye is false.]))
(;W[mr]C[This may look as if it works.];B[nr];W[os]
;B[ms]C[However Black plays here.];W[kr]
;B[ns]C[Black escapes.])))))
