(;GM[1]FF[4]SZ[19]
GN[White to kill]
PC[http://senseis.xmp.net/?Imagist/DifficultProblem2Attempts]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?Imagist/DifficultProblem2Attempts

White to kill]
PL[W]

AB[bb][cb][eb][bc][ec][fc][gc][dd][hd][id][ae][be][ce][de][fe]
AW[ea][db][fb][gb][cc][dc][hc][ic][ad][bd][cd]

;W[aa]C[W1]MN[1]
;B[ac]C[B2]MN[2]
;W[da]C[W3]MN[3]
;B[ca]C[B4]MN[4]
;W[fa]C[W5]MN[5]
;B[hb]C[B6]MN[6]

;
)
