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Re: [Bug-gnubg] Possible small UI simplification

From: Philippe Michel
Subject: Re: [Bug-gnubg] Possible small UI simplification
Date: Sat, 22 Aug 2015 00:12:58 +0200 (CEST)
User-agent: Alpine 2.20 (BSF 67 2015-01-07)

On Wed, 19 Aug 2015, address@hidden wrote:

Is there any reasonof any importance, beside the not important and VERY small UI simplification, to remove the non-deterministic noise ?

It seems useless to me (but I may have missed something, that's why I asked) and its documentation is rather obscure. Can you read what follows and complete the sentence "In ... case, I absolutely have to use the non-deterministic choice and here's why : ..." ?

If noise is added to the evaluations GNU Backgammon will take a Box Müller transform of a point in the unit circle and add to each possible outcome probability. This means that the addition is random, but distributed so that it's more likely to have an noise addition close to zero than a noise addition close to the limit. The noise addition is limited to the number you put into the noise field in the dialog box.

If you check the box Deterministic noise, the noise added to each evaluation will be based on a sum of the bytes in the hash of the board position, which (by the central limit theorem) should have a normal distribution. In that way you will always have that same noise amount to a position, since the noise added to the evaluation is only depending on the position itself.
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