(;GM[1]FF[4]SZ[19]
GN[Ko]
PC[https://senseis.xmp.net/?GokyoShumyoSection6Problem48/Solution]AP[GoWiki:2009]
DT[2023-01-25]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection6Problem48/Solution

Ko]
PL[B]

AB[cb][gb][cc][gc][ic][cd][ed][hd][ce][de]
AW[fb][dc][ec][bd][dd][gd][be][ee][ge][cf][df][ef]
LB[fc:a]

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

;LB[fc:a]
)
