(;GM[1]FF[4]SZ[19]
GN[Approach ko]
PC[http://senseis.xmp.net/?KyuExercise90/Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?KyuExercise90/Attempts

Approach ko]
PL[B]

AB[ea][db][dc][dd][ce][de][bf][cf][ch]
AW[cb][eb][gb][cc][ec][bd][cd][ed][ee][ef]
LB[be:c]

;B[ab]C[B1]MN[1]
;W[ca]C[W2]MN[2]
;B[da]C[B3]MN[3]
;W[bb]C[W4]MN[4]
;B[ac]C[B5]MN[5]
;W[aa]C[W6]MN[6]

;LB[be:c]
)
