(;GM[1]FF[4]SZ[19]
GN[Not a clean problem]
PC[https://senseis.xmp.net/?GokyoShumyoSection4Problem11/Solution]AP[GoWiki:2009]
DT[2022-12-29]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection4Problem11/Solution

Not a clean problem]
PL[B]

AB[hb][cc][dc][fc][gc][hc][ed][ee]
AW[eb][fb][gb][ec][bd][cd][dd]

;B[db]C[B1]MN[1]
;W[da]C[W2]MN[2]
;B[ca]C[B3]MN[3]
;W[fa]C[W4]MN[4]

;
)
