Author: Dann Corbit
Date: 15:45:34 02/23/06
Go up one level in this thread
On February 23, 2006 at 17:37:21, Gerd Isenberg wrote:
[snip]
>>a1b2 is a 64 bit unsigned integer with bits a1 and b2 set.
>
>Huch! That is possible!?
>Hopefully no indirect jump table with 2**64 entries ;-)
>Is that inside the generator or inside the chess programs.
For a given square, I need at most 128 constants per row or diagonal.
They are precomputed.
Obviously, you must have the 64 unique bitboards A1-H8 defined.
Then, your generator program writes (above the functions themselves):
printf("static const Bitboard a1b2 = %ui64;\n", A1|B2);
Any given file will need 128 for each column and 128 for each row and between 0
and 128 for each diagonal for both diagonals.
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