(;GM[1]FF[4]SZ[19]
GN[Reference]
PC[https://senseis.xmp.net/?BeginnerExercise125/Solution]AP[GoWiki:2009]
DT[2024-09-09]
C[Diagram from https://senseis.xmp.net/?BeginnerExercise125/Solution

Reference]
PL[B]

AB[dc][dd][hd][de][ge][ef][ff][gf][dg]
AW[cc][cd][fd][ce][ee][fe][cf][df]
LB[gd:a]

;B[fc]C[B1]MN[1]
;W[ec]C[W2]MN[2]
;B[eb]C[B3]MN[3]
;W[db]C[W4]MN[4]

;LB[gd:a]
)
