(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[http://senseis.xmp.net/?GokyoShumyoSection4Problem28/Solution]AP[GoWiki:2009]
DT[2009-04-22]
C[Diagram from http://senseis.xmp.net/?GokyoShumyoSection4Problem28/Solution

Solution]
PL[B]

AB[db][dc][gc][ed][fd][gd][be][ce][de][ee][ef][bg][cg][dg][cj]
AW[eb][gb][hb][cc][ec][fc][bd][cd][dd][ae][ge][he][af][bf][cf][df][eg][fg]

;B[cb]C[B1]MN[1]
;W[bb]C[W2]MN[2]
;B[ab]C[B3]MN[3]

;
)
