Author: Stuart Cracraft
Date: 17:00:04 08/06/04
Go up one level in this thread
Hi -- I made the changes. But when I do SEE on the
square e5 after e4, e5, Nf3, Nc6 d4, a6, it returns
-1000. If I do the same but after e4, e5, Nf3, Nc6,
d4, d6, it returns 1000.
I would have expected it to return 1000 after the first
sequence and 0 after the second? Since the first sequence
wins a pawn and the second sequence is even after dxe5
and dxe5.
The code has your fix from below and generates the
next_fig in the order of smallest defender, then
smallest attacker, then next larger defender,
then next larger attacker, etc. The defenders
are absolute value, so they come in like 1, 2, 3
and 2, 3, 4, etc. for both sides. Both are
positive and I am depending on the stm/-stm
to keep the up and down right.
Something is amiss.
Stuart
On August 06, 2004 at 18:54:11
Andreas Guettinger wrote:
>Two small glitches in my example:
>
>The array of values should be:
>mat_value[13] = {INFINITY, 900, 500, 300, 300, 100, 0, 100, 300, 300, 500, 900,
>INFINITY};
>
>and after looking for hidden figures the next_fig has to be updated to the next
>figure that takes part in the attack.
>
>For the minimax part, it's best to look at an examples and print out all the
>steps at first for debugging.
>Ok, this is maybe not the best example, just one that I came quickly up with.
>The scores in the minimax column derive from whether to back up the scores or
>stand pat, by following the if <= or >= part.
>
>
>[D]1k1q4/p7/1pp5/3n4/4B3/P4Q2/1PP5/2K5 w - -
>
>move: Be4xd5
>
>
>counter swapscore[counter] stm flag minimax swap
>0: 300 1 0
>1: 300 + (-300) = 0 -1 0 (back up)
>2: 0 + 100 = 100 1 -800 (don't back up)
>3: 100 - 900 = -800 -1 -800 (back up)
>
>backed up score = 0 (only exchange, net gain 0)
>
>
>[D]1k1q4/p7/1pp5/3n4/2P1B3/P4Q2/1P6/2K5 w - -
>
>move: c4xd5
>
>
>counter swapscore[counter] stm flag minimax swap
>0: 300 1 300
>1: 300 + (-100) = 200 -1 300 (back up)
>2: 200 + 100 = 300 1 300 (back up)
>3: 300 - 300 = 0 -1 900 (don't back up)
>4: 0 + 900 = 900 1 900 (back up)
>
>backed up score = 300 (win a knight)
>
>
>regards
>Andy
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