(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?BeginnerExercise273/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?BeginnerExercise273/Solution

Solution]
PL[B]

AB[da][ea][bb][gb][ib][cc][gc][cd][gd][ce][de][ee][fe][ge]
AW[fa][cb][eb][fb][dc][fc][dd][ed][fd]
LB[bc:a]

;B[ba]C[B1]MN[1]
;W[db]C[W2]MN[2]
;B[ca]C[B3]MN[3]

;LB[bc:a]
)
