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BGonline.org Forums
Rollouts
Posted By: Ted Smith
Date: Friday, 9 March 2012, at 6:31 p.m.
Stick, we had a brief conversation regarding rollouts last Sunday at the CBC tournament. I found the documentation I was trying to reference regarding GNUBG's rollouts:
"Quasi-Random Dice are used to reduce the element of luck in rollouts. Instead of selecting purely random dice, GNU Backgammon will ensure a uniform distribution of the first roll of the rollout. If 36 trials are requested, one game will start with 11, two games with 21, two games with 31, etc. In general, if n * 36 games is requested, n games will start with 11, 2*n games with 21 etc. This is called rotation of the first roll. Similarly, if n*1296 trials is requested, the second roll will be rotated, such that n games will start with 11-11, n games with 11-21, n games with 21-21, etc. The third roll be also be rotated if the number of trials is proportional to 46656."
Do you know if XG uses the same methodology? You had mentioned that whatever software you use does not implement this uniformization. I am curious as to what advantage lies in randomizing the dice in a rollout rather than this "quasi-random" algorithm...?
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