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

Author: Severi Salminen

Date: 13:21:15 02/26/01

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>Note that in crafty I don't do the attack_to/attack_from stuff, I dynamically
>compute it as needed with the rotated bitmap table lookups...  that might make
>a difference.

What is this attack_to/attack_from you are talking about? I do this in
gen_captures(bishop, for example): I take one white bishop from Board.Bishops.
Then I extract the necessary diagonal states which I use to get a bitboard which
has all bits on where a bishop might capture to. Then I AND this with black
pieces and scan through those. In make_move() I just move the pieces around and
update all bitboards. My board structure has only the necessary bitboards which
are needed to store the board and 3 rotated bitboards. So what are these
attack_to and _from bitboards and where are they used?

Severi

• Re: Bitboard VS array board ,speed difference in movegen() Robert Hyatt 07:23:08 02/27/01
  • Re: Bitboard VS array board ,speed difference in movegen() Severi Salminen 08:36:43 02/27/01
    • Re: Bitboard VS array board ,speed difference in movegen() Bo Persson 10:36:40 02/27/01
      • Re: Bitboard VS array board ,speed difference in movegen() Severi Salminen 02:58:48 02/28/01
      • Re: Bitboard VS array board ,speed difference in movegen() Dan Andersson 11:19:42 02/27/01

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