Backgammon: Jacoby rule with doubling cube?
The rule (as in the link):


  A rule popular in money play which says that gammons and backgammons count only as a single game if neither player has offered a double during the game. 


Probably the better way to say it is: If neither player has offered a double during the game, gammons and backgammons do not count.

This doesn't turn off the doubling cube, it just means that if you or your opponent don't double, the best you're doing is a single. Once the cube has been offered and accepted for the first time, gammons will count, and the normal range of 2-6 points is on the table. 

(In theory, this means that every game will have at least 1 double offered, since this rule removes the potential of a position being "too good to double" before the cube is turned for the first time.)