[F. trois three + POINT sb.1 B. 3 g.] The third point from the outer end in either table of a backgammon-board.

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1745.  Hoyle, Backgammon, viii. § 7. 50. 5 Men upon his Adversary’s Ace Point, and 3 Men upon his Adversary’s Trois Point.

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1870.  Hardy & Ware, Mod. Hoyle, Backgammon, 143. You must then endeavour to secure your adversary’s cinque, quatre, or trois point.

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