(;GM[1]FF[4]SZ[19:13]
GN[Difference Game]
PC[http://senseis.xmp.net/?ThrowInOrNot]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?ThrowInOrNot

Difference Game]
PL[B]

AB[eb][hb][ec][fc][gc][hc][ic][bi][cj][dj][dk][dl][fl][gl][il][em][hm]
AW[ea][ha][db][fb][gb][ib][dc][cd][dd][be][ek][fk][gk][hk][ik][el][hl]

;B[jb]C[B1]MN[1]
;W[fm]C[W2]MN[2]
;B[gm]C[B3]MN[3]
;W[jl]C[W4]MN[4]

;
)
