(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?GokyoShumyoSection5Problem18/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection5Problem18/Solution

Solution]
PL[W]

AB[da][fa][cb][db][eb][gb][hb][bc][cc][ic][hd][ce][ee][fe][ie][bf]
AW[bb][fb][ac][dc][ec][fc][gc][hc][ad][bd][cd][dd]

;W[aa]C[W1]MN[1]
;B[jb]C[B2]MN[2]
;W[ca]C[W3]MN[3]

;
)
