(;GM[1]FF[4]SZ[19]
GN[Black allows the ko]
PC[http://senseis.xmp.net/?BeginnerExercise144/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise144/Attempts

Black allows the ko]
PL[W]

AB[db][dc][hc][cd][de][df][ff][hf][eg]
AW[bb][fb][cc][ec][gc][ic][bd][fd][hd][be][cf][cg][dg]
CR[db][dc]

;W[ee]C[W1]MN[1]
;B[ef]C[B2]MN[2]
;W[dd]C[W3]MN[3]
;B[ed]C[B4]MN[4]

;CR[db][dc]
)
