(;GM[1]FF[4]SZ[19]
GN[I thought that we still have a two-stage ko after W6?]
PC[http://senseis.xmp.net/?BQM507]AP[GoWiki:2009]
DT[2010-02-24]
C[Diagram from http://senseis.xmp.net/?BQM507

I thought that we still have a two-stage ko after W6?]
PL[B]

AB[bb][cb][db][ac][cc][bd][be]
AW[ba][da][ab][eb][dc][cd][ed][ce][bf][cf]
CR[ab]
LB[ca:a]

;B[aa]C[B1]MN[1]
;W[ae]C[W6]MN[6]

;CR[ab]
LB[ca:a]
)
