(;GM[1]FF[4]SZ[19]
GN[Example 1, Difference Game (i)]
PC[http://senseis.xmp.net/?DifferenceGame]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?DifferenceGame

Example 1, Difference Game (i)]
PL[B]

AB[ea][ka][ma][eb][kb][mb][ec][kc][mc][ed][kd][ee][ke][me][ef][kf][lf][mf]
AW[fa][ha][na][fb][hb][nb][fc][hc][nc][fd][hd][nd][he][ne][ff][gf][hf][nf]

;B[fe]C[B1]MN[1]
;W[md]C[W2]MN[2]
;B[ld]C[B3]MN[3]
;W[ge]C[W4]MN[4]

;
)
