a game for two people played on a board marked with long thin triangles. Players throw dice and move pieces around the board. 十五子棋戏（棋盘上有楔形小区，两人玩，掷骰子决定走棋步数） 
Word Originmid 17th cent.: from back + gammon, mid 18th cent.: apparently from Old English gamen or gamenian (see game), with survival of the -n ending.
