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Subject: Re: Java vs. C++ Chess Programming Question

Author: Antonio Dieguez

Date: 10:37:03 05/16/01

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On May 15, 2001 at 20:28:25, Sam Gross wrote:

>I am writing a bitboard-based chess engine in Java, and a preliminary test of
>the search function (plain alpha-beta search, no transposition table, history,
>null move, or anything else) was pretty disappointing.  I am getting about 10%
>of the nps crafty gets on the same machine, even though my evaluation function
>is just the material imbalance.  My question is, how much of this is due to
>differences in speed between Java and C++, and how much is due to lack of a
>transposition table (or other factors)?  Also, I wonder if my program may be
>stretching Java's automatic garbage collectors.  A new copy of my board is made
>for every node, and each node creates many instances of my move object, which I
>imagine would use up a lot of time.  Any help would be appreciated.

I did a java chess program. Not bitboard based. A lot of arrays. And, just in
case you want to know, when I translated it to c++ and compiling with cygwin,
there was a factor of just 2 (I was dissapointed...). A bit later when I updated
the applet a little(primary the eval) the factor... growed(?) to more or less
Anyway with the best compiler around and doing optimizations and in a newer
computer than mine the c++ version can be much more faster.
If you want to see my java source code(in wich there is nothing so special) is


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