(;GM[1]FF[4]SZ[19]
GN[Unconditional]
PC[https://senseis.xmp.net/?GokyoShumyoSection6Problem73/Solution]AP[GoWiki:2009]
DT[2023-01-23]
C[Diagram from https://senseis.xmp.net/?GokyoShumyoSection6Problem73/Solution

Unconditional]
PL[B]

AB[ba][bb][gb][bc][cc][gc][cd][fd][ce][fe][ff][eg]
AW[ab][cb][fb][ac][dc][fc][ae][de][ee][bf][cf][dg][ch]

;B[df]C[B1]MN[1]
;W[ef]C[W2]MN[2]
;B[da]C[B3]MN[3]
;W[db]C[W4]MN[4]
;B[dd]C[B5]MN[5]
;W[ed]C[W6]MN[6]
;B[fa]C[B7]MN[7]

;
)
