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Dimension SI Imperial Japanese
(mm) (inch)
Board width 424.2 16 23/32 1.4 shaku 尺
Board length 454.5 17 29/32 1.5 shaku 尺
Board thickness 151.5 5 31/32 0.5 shaku 尺
Line spacing width-wise 22 7/8 7.26 bu 分
Line spacing length-wise 23.7 15/16 7.82 bu 分
Line thickness 1 1/32 0.3 bu 分
Star point marker diameter 4 5/32 1.2 bu 分
Stone diameter 22.5 29/32 7.5 bu 分
As the line isn't included in the line spacing, in order to fit the goban width, we'd have the following result:
18 * 22mm (the squares) + 19 * 1mm (the lines) = 415mm
total border width = ( board width - lines+square width ) = ( 424.2 - 415 ) = 9.2 mm
That leaves a given border width of 9.2/2 = 4.6 mm
Are the edges of a goban really only 4.6 mm to the first line? Can someone measure this to confirm?
