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Subject: Re: no transposition tables

Author: Tom Kerrigan

Date: 13:54:46 06/19/00

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On June 19, 2000 at 16:27:58, John Coffey wrote:

>Let us say that I have a system with not much RAM, like the Gameboys that I
>program.  Transposition tables are out of the question.   The Gameboy Advanced
>(16 mhz risc processor) has 1/4 meg available as an option that can be placed on
>an external cartridge, but I figure that is not enough to do anything.

256k is a terrific size for a hash table, esp. if the processor is 16mhz.

>Here is what I am thinking for a chess program:  Iterative iterative deeping.
>If I have a 7 play search, and I am at ply 4 deep, it would still do a 1 ply
>followed by a 2 ply folled by 3 ply to finish that branch of the tree.
>
>Of course I would give priority to checks and some captures.
>
>Would it help?

If you think about it, searching 1 ply at each leaf of a 6 ply search is exactly
the point of searching 7 ply.

-Tom



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