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Questions about variant engines - BGBlitz 3.2.1 is published

Posted By: MK
Date: Saturday, 1 February 2025, at 10:31 a.m.

In Response To: BGBlitz 3.2.1 is published (Frank Berger)

After sending you an email, I realized that asking the questions here would be more appropriate as others can possibly benefit from your answers also.

Your user guide says:

"Setup Game" Configure the game itself, including cube usage, Crawford or Jacoby rules, manual or automatic dice, and the Egyptian rule. You can also use starting positions from Nackgammon, Snake, or Longgammon, or play "Tables" (backgammon without the cube and Backgammons).

Are all variants simply different starting positions and different valid moves, played with the same engine? Or was the bot trained separately for each variant?

If no, aren't equities for the same positions different in all/most of these variants? So, how can the bot play them correctly using the same neural net?

If yes, could you document the differences a little more in detail for each of the above?

Crawford? : I think this is handled using MET's? If so, please skip.

Jacoby? : Both in match and money games?

Egyptian rule? : GnuBG manual says "The position evaluator in GNU Backgammon doesn't have a clue about how to evaluate positions according to the Egyptian rule". How does your bot handle them?

Nackgammon? : Skip this. It's just another lame starting position variant played with the same engine in all bots.

Snake? :

Longgammon? :

Tables? :

Thanks.

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