Computer Chess Club Archives

Search

Terms

Messages

Subject: Re: Why is Rebel 8 engine within Rebel 9 15 % slower than original Rebel 8 ?

Author: Ed Schröder

Date: 08:21:23 11/17/97

Go up one level in this thread

>Posted by Jouni Uski on November 17, 1997 at 01:18:02:

>If I run Rebel 8 engine in Rebel 9 it's about 15 % slower than real
>Rebel 8 ! Ed, what's the reason? I tested with exactly same settings
>in both cases - PC is 486.

Maybe you can be more precisely?

I have taken one example, here is the output.

r1bq1rk1/3nbppp/p2pp3/6PQ/1p1BP2P/2NB4/PPP2P2/2KR3R w - - bm d4g7;

Level is PLY9
Hash table set to 4 Mb

Rebel 9.0   1:10  (nodes 4,897,611)
R8 (module) 1:15  (nodes 5,565,251)
R8 (real)   1:16  (nodes 5,566,305)

The only difference between Rebel8 as module (R8M) within Rebel9 and
the real thing (R8) is that R8M also make use of the doubling in
maximum ply depth from 30 to 60 plies which could be a clue.

But as you can see from the above example there is almost no difference
at all in the total nodes searched.

Perhaps you should post your examples?

- Ed Schroder -

This page took 0 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.