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Subject: Bitboard VS array board ,speed difference in movegen()

Author: TEERAPONG TOVIRAT

Date: 21:57:05 02/23/01

Hi,

I want to measure the speed difference in move
generation between bitboard and array board.
I think it's unfair to compare the speed of these
two movegen() directly,because bitboard calculates
attacked squares in makemove() and also unmake()
(at least the technique I used) .
So,the test should include makemove(),unmake() too.
The question is what is the optimum ratio for
each function?
Suppose the branching factor is 4, this means that
in a real situation,approximately the first 4 moves
are passed to next ply repeatedly.
So, the ratio should be 1:4:4 for movegen():
makemove():unmakemove. Here is my test...

       for(iteration n times)
        {
        movegen() // of course, n times
        for(first 4 moves) // so, 4n times
         	{
	makemove();
        	unmakemove();
        	}
        }

Any comments?

Thanks in advance,
Teerapong

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