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Subject: Re: 64-Bit random numbers

Author: Robert Hyatt

Date: 06:57:59 10/29/03

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On October 29, 2003 at 05:07:31, Dan Andersson wrote:

> What you are saying isn't totally correct for most PRNGs. Even if you use the
>Mersenne Twister the number of bits that you can safely use decrease if you just
>combine the output of a series. In the MT case I think the number of safe bits
>decrease to about 53. But this is very paranoid limits.
>
>MvH Dan Andersson
\

You are thinking too big.  We only need 12 * 64 random numbers for Zobrist
hashing.  It won't matter whether you generate 768 64-bit numbers, twice as
many 32 bit numbers and concatenate them, or even 49152 single-bit random
numbers and combine 'em 64 at a time.  The sample size is way small.  If you
are throwing darts with a Monte Carlo trial, I'd be more concerned when you
start tossing 2B darts.  But not 768.



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