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Subject: Re: Is my branching factor normal ?

Author: Andrew Williams

Date: 02:46:42 07/04/04

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On July 03, 2004 at 22:31:54, Mathieu Pagé wrote:

>Hi !
>
>I was wondering, what is a normal branching factor for my program... it use
>AlphaBeta, iterative deepening, a transposition table and an aspiration search.
>it's evaluation function is blindly fast (and bad). For the starting position I
>got branching factor of less thant 2 (time to depth N+1 / Time To depth N).
>
>is this normal ?
>
><output>
>MatMoi version: 5.12.2
>Creer par Mathieu Page
>Date: Jun 12 2004 19:36:41
>
>>st 60
>>gonow
>              depth   time  score   variation
>                1->   0.09   0.00   a2a3
>                2->   0.13   0.00   a2a3 a7a6
>                3->   0.17   0.00   a2a3 a7a6 a3a4
>                4->   0.20   0.00   a2a3 a7a6 a3a4 b7b6
>                5     0.24   1.00   b2b3 a7a6 c1a3 b7b6 a3e7
>                5->   0.28   1.00   b2b3 a7a6 c1a3 b7b6 a3e7
>                6->   0.66  -1.00   b2b3 b7b6 b3b4 c8b7 b4b5 b7g2
>                7->   1.27   1.00   b2b3 a7a6 a2a3 b7b6 c1b2 c7c6 b2g7
>                8->   5.38  -1.00   b2b3 a7a6 b3b4 b7b6 a2a3 e7e6 b4b5 a6b5
>                9->  12.55   1.00   b2b3 a7a6 b3b4 b7b6 e2e3 c7c6 e3e4 d7d6 f1a6
>

Do you have a bug here? Why would the score go from 0.00 to +1.00 and then to
-1.00 and then back to +1.00? Before worrying about your branching factor, I
would look in detail at the apparent problem you have above.

Andrew




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