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#1640: "possibly non-random dice"

wontfix: Problém nebude opravený

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Backgammon #10459903

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3 Oct 2014 07:01 • Darnoc • Problém zatiaľ nebol zopakovaný programátormi:

At table 10459903 there were 10 doubles rolled and 33 non-doubles. This is suspicious, but it is impossible to prove there is a bug. However, I suggest the php code be inspected to see if it uses the "rand" function. PHP rand uses the underlying "libc" rand function, which is notoriously non-random in some implementations. In particular it is bad in Windows, which might be what the server is running(?) Even in unix, "rand" is a poor choice. I suggest using the preferred PHP function for random numbers: "mt_rand". Easy to switch, as the function interfaces are identical.

See link: php.net/manual/en/function.mt-rand.php

Also, I would love to view the source code, to look for this problem, and others. Long ago I wrote the math library IBM used in many computers, including a then state-of-the-art random number generator, so I might spot other sources of non-randomness. I have a BGA Studio login, but the owner of the code would have to grant me access.

PS: seeding the random number generator can also cause problems, so I suggest *not* using srand/mt_srand, unless you seed the function from random.org, or some other source of true randomness.

3 Oct 2014 20:20 • pejsek • Problém zatiaľ nebol zopakovaný programátormi:

You created a duplicate bug to one you already have posted to. You might want to check his answer there, and concentrate discussion on this topic to one bug report.

2 Sep 2015 16:24 • bidulpik • Problém nebude opravený:

no bug

9 Jan 2020 16:04 • Igrac • Problém nebude opravený:

From table: 62542097

Why is Backgammon game not fair? The last two games dies throws are:
First game:
Me: 138 points with 4 times doubles
Opponent: 174 points with 5 times doubles

Second game:
Me: 158 point with 4 times doubles
Opponent: 195 points with 5 times doubles

2 Nov 2020 19:44 • marcelf • Problém nebude opravený:

J’ai le meme probleme. Dans une journee c’est tres difficile de gagner avec plusieurs essais (20) et normalement je gagne souvent. marcelf

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#1640: "possibly non-random dice"

O čom je toto hlásenie?

Čo sa stalo? Prosím vyber z nasledujúcich

Čo sa stalo? Prosím vyber z nasledujúcich

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