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Backgammon Forum hosted by Bill Robertie. Discussion of anything related to backgammon: strategy, problems, books, clubs, and tournaments.

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Old 07-15-2020, 05:33 PM   #26
echidna
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Join Date: Mar 2020
Posts: 6
Re: Backgammon Galaxy dice are rigged

Quote:
Originally Posted by Robertie View Post
Excellent point. I'm particularly curiously as to how sites select the 'unlucky' people. Are they chosen at random, or are darker forces at work?
I was selected because I'm 5'1", 240lbs, have the face of a donkey, and a microphallus. I suspect that's why others were chosen too.
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Old 07-17-2020, 10:08 AM   #27
Gobbs23
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Join Date: Apr 2019
Posts: 36
Re: Backgammon Galaxy dice are rigged

Just to update my previous post:

Remember, we would expect a particular double to occur once every 36 rolls (2.78 percent) and any double to occur once every 6 rolls (16.67 percent). I analyzed all 56,930 rolls (28,483 by me and 28,447 by my opponents) over my last 256 matches. Therefore, we would expect a particular double to occur just over 1,581 times and any double to occur just over 9,488 times. The results are:

11 - 1,613
22 - 1,614
33 - 1,596
44 - 1,559
55 - 1,626
66 - 1,490
Total - 9,498

Overall, over the course of 256 matches (about 1,800 games, give or take) and almost 57,000 rolls, my opponents and I have rolled doubles only 10 more times than the expected value - well within expected variances and deviations and definitely close enough to show any perception that doubles occur too often is incorrect. In fact, together, we rolled significantly fewer double sixes than expected. A quick check showed this is not one-sided, we both rolled fewer double sixes than expected.

So, I think it's safe to say that the dice are not rigged to roll more doubles. It's just people's skewed perceptions.
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