(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play and rescue 4 stones]AW[qm][on][mo][qo][kp][lp][qp][mq][nq][pq][pr]AB[mp][np][op][pp][rp][lq][qq][qr][rr]TR[mp][np][op][pp]
(;B[mr]C[This is the correct move, threatening to catch white before
white can fill the four liberties on the black stones.]
;W[nr]
(;B[ns]C[This is the next key move to keep white's liberties down.]
(;W[lr]C[If white plays the double atari...]
;B[or]C[Then black wedges in, catching white short of liberties.]
(;W[kq]
;B[oq]C[Black gets two stones and escapes.])
(;W[oq]C[This is self-atari.]
;B[ps]))
(;W[or]
;B[lr]))
(;B[or]C[If you wedge at once...]
;W[oq]C[... then white connects without shortage of liberties
and black has too much to defend against.]
;B[lr]
;W[os]
;B[qs]
;W[no]
;B[ps]
;W[oo]C[Black is captured
]))
(;B[oq]C[Wedging through fills one of black's own liberties.]
;W[or]
;B[nr]
;W[mr]
(;B[lr]
;W[ns]C[White will capture black.])
(;B[ns]
;W[ms]
;B[lr]
;W[os]C[Again white gets more liberties than black.])))
