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[Bug-gnubg] bias in the probability to win a gammon?

From: Mrs Bibi e Bibo
Subject: [Bug-gnubg] bias in the probability to win a gammon?
Date: Wed, 30 Apr 2014 13:22:38 -0700 (PDT)

I did a simple experiment in which I let gnubg play against itself 1800 games in $ mode (unlimited) and without cube (actually, I played the first 20 games). This is an important point. The machine was set as computer against human, in settings>players and I had to click "end game" every single game. I noticed that the advantage of gnubg steadily increased.  Intrigued, I did some statistical analysis and found  a statistically significant difference in the probability of winning a gammon between gnubg and the human player.  Apparently gnubg has a probability nearly 3% higher. I have attached a PDF file with my results. I find difficult to believe that gnubg cheats but I wanted to share with you these results,  perhaps someone knows better. Thanks!

Attachment: Gnu_bg Test.pdf
Description: Adobe PDF document

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