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Gammons and backgammons

Two ways to win more than a single point — and why they change how you play.

Most backgammon games are worth one point. A game becomes worth more when the loser is not merely behind but stranded.

The definitions

TermPointsCondition
Single game1The loser has borne off at least one checker.
Gammon2The loser has borne off no checkers at all.
Backgammon3The loser has borne off nothing and still has a checker on the bar or in the winner's home board.

The condition is about the loser's position at the moment the game ends, not about how the game was played. One checker borne off — even the very last roll before defeat — reduces a gammon to a single game.

Why the difference matters

Gammons change cube decisions more than they change checker play. If you are winning and gammons are live, doubling can be a mistake — your opponent drops for one point and you lose the extra point you were on track to win. If you are losing and gammons are live against you, a take that would otherwise be routine becomes wrong, because some of your losses now cost four rather than two.

How often do they happen?

Gammons are common — a substantial fraction of decided games. Backgammons are rare, typically a percent or two, because they require the loser to have a checker still trapped in the winner's home board at the very end.

Watching it change

Because a gammon depends on the loser bearing off nothing, gammon chances collapse the instant your opponent takes their first checker off — from whatever they were straight to zero. Game review shows this: the gammon band under the win curve vanishes at that exact move.

Review a finished game to see how the gammon and backgammon chances moved with each play.

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