(;GM[1]FF[4]SZ[19]
GN[Counter-example]
PC[http://senseis.xmp.net/?BeginnerExercise258/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise258/Attempts

Counter-example]
PL[W]

AB[fa][cb][db][eb][fb][dc][gc][hc][ic][dd][ce][af][bf][cf][df][ef][ci]
AW[ba][ca][da][ea][bb][cc][ec][ad][cd][ed][gd][id][be][de][ee][ge][ie]
LB[bc:a]

;W[ae]C[W1]MN[1]
;B[ac]C[B2]MN[2]
;W[bd]C[W3]MN[3]
;B[ab]C[B4]MN[4]

;LB[bc:a]
)
