jacoby rule in backgammon game

[williamsoo]

What means jacoby rule in backgammon game?

[dominique]

In backgammon, the Jacoby rule means that Gammons and Backgammons count only as a single game unless one of the players offers a double in that game.

That way play goes faster, because players can't avoid doubling just so they can play on for a gammon.

[gmauunoo]

The Jacoby rule allows gammons and backgammons to count for their respective double and triple values only if the cube has already been offered and accepted. This encourages a player with a large lead to double, possibly ending the game, rather than to play it to conclusion hoping for a gammon or backgammon. The Jacoby rule is widely used in money play but is not used in match play.