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RE: [Bug-gnubg] grandmaster with 3ply

From: Alain Redlinger
Subject: RE: [Bug-gnubg] grandmaster with 3ply
Date: Tue, 26 Jan 2010 13:36:13 +0100

Hi Filipa and Louis

I had the same « random.org » problem (both dice always within 1 and 3) with the october build (2009-10-26).

This is solved with the latest (december) build.



Alain Redlinger




De : address@hidden [mailto:address@hidden De la part de Louis Zulli
Envoyé : mardi 26 janvier 2010 11:06
À : Filipa Andrade
Cc : address@hidden
Objet : Re: [Bug-gnubg] grandmaster with 3ply


Hi Filipa,


I just tried www.random.org for dice generation. It worked correctly for me.


What version of gnubg do you have? Go to Help-->About gnubg-->Build Info to see.



Hi Louis,

thanks for your answer. I am using the same number generator as you.
My memory is not fooling me because I wrote the results in a paper for more than 100 games. I started to have this feeling some weeks ago and then started to write the results of who starts first. I will continue though :P

I do not suspect any cheating, I was just curious if it happens to anyone else.

Still related to the number generators, when I use random.org with seed 16000000 I only get numbers between 1 and 3 in both dice. Does this have an explanation?

Thanks again.

On Tue, Jan 26, 2010 at 01:06, Louis Zulli <address@hidden> wrote:


If I recall, for a binomial distribution with n=100, p=.5 and q=.5, the standard deviation is sqrt(n*p*q) = 5. So having gnubg start first 80 times represents 6 standard deviations above the mean. The probability of this happening by chance is very, very small!

Maybe you were simply very, very unlucky. Or maybe your memory is fooling you.

For my dice generation, I use a random number generator (Mersenne Twister). I have no sense that gnubg wins the first roll more than I do, and I have played hundreds (maybe thousands) of games.


On Jan 25, 2010, at 7:07 AM, Filipa Andrade wrote:

> Hi,
> I am playing against gnubg in grandmaster level with 3ply.
> I find it strange that only around 20% of the times I start. 80% is gnubg that starts. Is it normal? I have made a sample of more than 100 games.
> I a normal 7 games match it happens often that I never get to start first. Which are the best dice settings?
> Thank you for your help and thank you so much for gnubg, I am learning a lot!

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> Bug-gnubg mailing list
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