(;GM[1]FF[4]AP[Drago:4.22.03]SZ[19]CA[UTF-8]AB[ps][pr][qr][mr][mq][mo][np][op][pp][qp][ro][rn][sp]AW[nq][oq][pq][qq][rq][rp][rr][rs][qs]
(;B[ns]C[Black cannot connect the three stones out here or the adjacent points.];W[os];B[or];W[nr])
(;B[sq];W[sr]
;B[ns]C[Reducing the corner liberties allows this play to connect the three stones out because of 
white liberty shortages.];W[so]C[However taking the two edge stones threatens a second eye or to trap the three stones again.]
(;B[sp];W[os];B[or];W[nr])
(;B[nr];W[sp]))
(;B[sr]C[This is correct play to reduce liberies and not leave the eye-threat.];W[sq];B[ns];W[os];B[or]
(;W[nr]C[Now White is in self-atari and taking the edge stone instead does not threaten an eye.])
(;W[so];B[nr])))
