(;CA[Windows-1252]FF[4]AB[pg][nh][oh][qh][li][mi][mk][md][le][ne][qe][nf][qf][og]
AW[nd][of][pd][qd][pf][mg][ng][mh][ni][pi][nj][qj][rj][nk][od]PL[B]C[Diagram from http\://lifein19x19.com/

]
AP[GoWiki:2009]SZ[19]GM[1]GN[]DT[2011-08-12]PC[http\://lifein19x19.com/]MULTIGOGM[1]

(;W[lg];B[kg];W[kf]
(;B[jg];W[lf]
(;B[je]C[sharpest play];W[kh]
(;B[jh]
(;W[ki]
(;B[lh];W[lk]C[good timing];B[kj];W[ji];B[ii]C[a ladder, but...];W[jf];B[if];W[ig]
C[white has gained the atari he needs.];B[ih];W[ie];B[hg];W[ke];B[jd];W[kd];B[kc]
;W[jc];B[id];W[lc];B[kb];W[mc]C[Escape!])
(;B[kj];W[ji]
(;B[jf];W[lh]C[escape])
(;B[lh];W[jf];B[if];W[ig]C[too many cutting points])))
(;W[ji]C[Looks good, but doesn't work.];B[jf]C[Now, white is short on liberties.]
;W[ki];B[lh]C[There are no ladders here, which is the purpose of the black stone at N9 in the setup.]))
(;B[lh]C[too easy];W[jf];B[if];W[ig];B[jh];W[ie];B[hf];W[ke]))
(;B[ie]C[this move worked when white started at L12, but now white has a vital extra liberty]
;W[ke];B[kd];W[me];B[mf];W[oe];B[me];W[mc];B[ld];W[jd]C[The value of the liberty at M12 becomes clear.]))
(;B[kh];W[lf]C[too easy]))
(;W[kh]C[One of only two interesting moves.

Although better shape than the empty triangle, in this case it makes a premature choice in direction.]
;B[lh];W[lg];B[kg];W[kf];B[jg];W[lf];B[ie])
(;W[lf]C[easily caught in a ladder];B[lg];W[lh];B[kh];W[kg];B[mf];W[lg];B[jg])
(;W[kg]C[easily caught in a ladder];B[lg];W[lh];B[kh];W[lf];B[mf];W[lg];B[jg])
(;W[lh]C[easily caught in a ladder];B[kh];W[kg];B[lg];W[lf];B[mf];W[lg];B[jg]))