(;GM[1]FF[4]SZ[19]
GN[Black mistake]
PC[http://senseis.xmp.net/?Numbers]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?Numbers

Black mistake]
PL[B]

AB[ie][if][jf][jg][jh][kh][ki][kj][lj][lk][ll][ml][mm][mn][mo]
AW[fe][ge][he][ff][fg][gg][hg][ig][fh][fi][gi][hi][ii][ji][fj][fk][gk][hk][ik][jk][kk][fl][fm][gm][hm][im][jm][km][lm][fn][fo][go][ho][io][jo][ko][lo]

;B[kl]C[B1]MN[1]
;W[ln]C[W2]MN[2]

;
)
