(;GM[1]FF[4]SZ[19]
GN[Solution]
PC[https://senseis.xmp.net/?HitachiNumber17]AP[GoWiki:2009]
DT[2022-04-13]
C[Diagram from https://senseis.xmp.net/?HitachiNumber17

Solution]
PL[B]

AB[bb][eb][cc][dc]
AW[fb][ec][gc][bd][ed][ce]

;B[ca]C[B1]MN[1]
;W[db]C[W2]MN[2]
;B[ea]C[B3]MN[3]
;W[ab]C[W4]MN[4]
;B[ac]C[B5]MN[5]
;W[bc]C[W6]MN[6]
;B[aa]C[B7]MN[7]

;
)
