Fair Backgammon

Backgammon that cannot
fix the dice

Every roll is decided before the match starts.

The whole sequence of rolls is fixed before the first move and can be checked when the match ends. The computer does not see them coming either. No ads, no purchases, no account.

How the proof works Press kit

How it plays

A board that fits a phone

A real backgammon board is wider than it is tall, which does not fit a phone held upright. So it stands a quarter turn: twelve points down each side, the bar between them. Every point stays more than four times the width of a fingertip.

A backgammon board turned a quarter turn for a phone: twelve points down each side, the bar between them, checkers stacked inward.
The board in portrait

Fair play

Fixed before the first roll

The entire sequence of dice is decided before the match starts, and committed to with a hash you can see straight away. When the match ends the seed is revealed and anyone can recompute every roll. The computer plays the same dice you do.

The fairness screen showing the commitment hash, the seeds, and the position in the stream.
The proof

Afterwards

What each move cost

The analysis walks back through the match and puts a number on each move. Not a verdict, a difference: this is what you played, this is what the best line was worth.

The post-game analysis listing each move and how much it gained or lost.
What the move cost

What is true today

  • No ads
  • No in-app purchases
  • No account, ever
  • No network connection at all
  • No review pop-up
  • Universal: iPhone and iPad

Not true yet: this is in development. There is no release date, no store page to link to, and no player numbers or review scores, because there are none. When there is a store page this line will say so.