Author: Mathieu Pagé
Date: 06:54:16 07/04/04
Go up one level in this thread
On July 04, 2004 at 02:49:09, Volker Böhm wrote:
>Hi,
>
>it may be normal for the first plys on the starting position. Depends on your
>eval-function. If it has only material the branching factor could be again less
>than yours, because on the starting position there are very little capture
>moves.
>
>Try a more complex situation. If the branching factor stays below 2 then it is
>not normal for my chess engine.
>
>I like the following position that is often used for perft tests:
>
>r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq
>
>Volker
<output>
MatMoi version: 5.12.2
Creer par Mathieu Page
Date: Jun 12 2004 19:36:41
>setboard r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 0
>st 60
>gonow
depth time score variation
1 0.02 3.25 e2a6
1-> 0.13 3.25 e2a6
2-> 0.30 0.00 e2a6 b4c3
3-> 0.78 3.25 e2a6 b4c3 f3f6
4-> 1.31 0.00 e2a6 e6d5 e4d5 b4c3
5-> 6.78 2.25 e2a6 h3g2 h1g1 b4c3 f3f6
6-> 8.36 -1.00 e2a6 b4c3 b2c3 e6d5 e5d3 h3g2
7 9.31 1.75 d5e6 e7e6 e2a6 e6e5 a6b7 b4c3 b7a8
7-> 11.67 1.75 d5e6 e7e6 e2a6 e6e5 a6b7 b4c3 b7a8
8 18.33 -1.25 e2a6 b4c3 d2c3 h3g2 f3g2 f6g8 d5e6 g7e5
8-> 29.41 -1.25 e2a6 b4c3 d2c3 h3g2 f3g2 f6g8 d5e6 g7e5
9 59.78 11/48 b2b3
time: 59.91 n: 42112724 nps: 702980
</output>
The branching factor between ply 8 and 7 is : 2.52. This is more than 2 but
not much. between 6 and 5 it is : 1.23 ....
If this is not normal, I am surprised, because it seem to play well. Not well
as in strong, but when it play it do not seem to miss anything.
I hope you wll not tell my I have a bug, cause I won't know where to look.
Mathieu P.
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