(;GM[1]FF[4]SZ[19]
GN[The ko idea no longer works for White]
PC[http://senseis.xmp.net/?BQM578/Attempt]AP[GoWiki:2009]
DT[2013-04-23]
C[Diagram from http://senseis.xmp.net/?BQM578/Attempt

The ko idea no longer works for White]
PL[W]

AB[ba][ca][ga][db][gb][ec][fc][gc][ed][be][ce][de]
AW[ab][bb][cb][ac][bc][cc][dc]

;W[eb]C[W1]MN[1]
;B[ea]C[B2]MN[2]
;W[da]C[W3]MN[3]
;B[fa]C[B4]MN[4]

;
)
