Ifyouarelookingforaboardforthefamily,itdoesn'tmatterwhatsizeitis;justmakesurethatit'seasytomovethebackgammonpiecesaroundtheboardandthatthere'senoughspaceforthedicetoroll.
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If you are looking for a board for the family, it doesn't matter what size it is; just make sure that it's easy to move the backgammon pieces around the board and that there's enough space for the dice to roll.