Author: Tony Werten
Date: 02:56:52 11/27/01
Go up one level in this thread
On November 27, 2001 at 04:55:14, Tony Werten wrote:
>On November 26, 2001 at 17:55:23, Michel Langeveld wrote:
>
>>On November 25, 2001 at 15:07:16, Tony Werten wrote:
>>
>>>On November 25, 2001 at 11:30:51, Michel Langeveld wrote:
>>>
>>>>Fixed some errors in the passer code...
>>>>
>>>> //grouping rule
>>>> //isolated pawns
>>>> //passers
>>>> //double and triple pawns
>>>> bool whiteGroup = false;
>>>> bool blackGroup = false;
>>>> int whiteGroups = 0;
>>>> int blackGroups = 0;
>>>> bool whiteIsolated = false;
>>>> bool blackIsolated = false;
>>>>
>>>> for (int i=0; i<8; i++)
>>>> {
>>>> if (evalStructure.whitePawnsPlace[i] > 0)
>>>> {
>>>>
>>>> //double pawns
>>>> if (evalStructure.whitePawnsPlace[i] == 2)
>>>> {
>>>> score -= PAWNDOUBLE_PENALTY;
>>>> }
>>>> if (evalStructure.whitePawnsPlace[i] == 3)
>>>> {
>>>> score -= PAWNTRIPLE_PENALTY;
>>>> }
>>>>
>>>> //passer?
>>>> if (evalStructure.blackPawnsPlace[i] == 0)
>>>> {
>>>> if (
>>>> (i != 0 &&
>>>> evalStructure.blackPawnsPlace[i-1] == 0 &&
>>>
>>>connected passed pawns don't pass this test
>>>
>>>> evalStructure.whitePawnsPlace[i-1] > 0 &&
>>>> evalStructure.blackPawnsPlace[i-2] == 0) ||
>>>
>>>How are passed pawns and not having a pawn 2 files away related ? BTW i-2 can
>>>become -1 here, hope your array runs from -1 to 8.
>>
>>I also evaluate pawns 2 further than the current pawn because I had big problems
>>with evaluation the following pawn structure.
>>
>> 8/pppp4/8/8/8/8/P1PP4/8 w - - 0 1
>>
>>How many passed pawns does white have....?
>
>0
>
>White has a passed pawn when: (board seen from white)
>
>white has a pawn on current line
>AND
>(black does not have a pawn on current line OR *1
> blackpawn_rank[current_line] < whitepawn_rank[current_line]) *1
>AND
>(current_line=0 OR
> black does have pawn on [current_line-1] OR
^^^
oops, not
> blackpawn_rank[current_line-1]<=whitepawn_rank[current_line])
>AND
>(current_line=7 OR
> black does have pawn on [current_line+1] OR
^^^
not
> blackpawn_rank[current_line+1]<=whitepawn_rank[current_line])
>
>In your diagram none of the 3 pawns pass *1
>
>>
>>p.s.1 yes there's a bounce problem in my code. I programmed it in by purpose to
>>gain some extra speed. But fixed it later again.
>>p.s.2 I'm not sure what you meant by the connected passed pawns comment. Can you
>>give an example?
>
>I'm not sure how many passed pawns your evaluation finds here.
>
>[D] 7k/8/8/8/8/8/2PP4/7K w - - 0 1
>
>Tony
>
>>
>>Thanks for your comments.
>>
>>Regards,
>>
>>Michel
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