(;GM[1]FF[4]SZ[19]
GN[Mistake 1]
PC[http://senseis.xmp.net/?EndgameTesuji11]AP[GoWiki:2009]
DT[2010-03-05]
C[Diagram from http://senseis.xmp.net/?EndgameTesuji11

Mistake 1]
PL[W]

AB[fb][bc][dc][fc][cd][fd][de][ee][ff]
AW[gb][gc][bd][gd][be][ce][ge][df][cg]
LB[ac:a]

;W[fa]C[W1]MN[1]
;B[ea]C[B2]MN[2]
;W[ga]C[W3]MN[3]
;B[cb]C[B4]MN[4]

;LB[ac:a]
)
