(;GM[1]FF[4]SZ[19]
GN[A way kos can help (double-ko seki)]
PC[http://senseis.xmp.net/?BeginnerExercise9/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise9/Solution

A way kos can help (double-ko seki)]
PL[B]

AB[ba][da][fa][ab][bb][cb][fb][bc][fc][fd][fe][af][bf][cf][df][ef][ff]
AW[ea][db][eb][ac][cc][dc][ec][bd][cd][ed][ae][be][ce][de][ee]


;
)
