Author: David B Weller
Date: 15:18:40 01/06/05
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Hi Geoff, The fact that you stumble over my code is probably a credit to your intellegence, and if I tried to explain: attack_mask[][], I would embarass myself. In fact, while thinking over how to best answer your question, I too became somewhat puzzled as to how what I did, actually improves GES performance. It really is inacurate. The part I added is at the end of control.cpp and 1 line in evaluate.cpp : s += count_ctrl() * 3; the '3' is pulled from memory - I think Prof Hyatt used it for Bishop mobility, but since what I am counting isnt the same, it is probably way off. WAY off. The basic idea of count_ctrl() is to detirmine who 'owns' each of the 64 squares. But it is very simple and naive. It makes assumptions which are probably true more often than not, but still wrong much of the time. eg., if white has a pawn attacking a square, but black doesnt have a pawn attacking that square - white owns the square. regardless of what else is attacking it. If both have pawns attacking [or, niether do] then the same idea is applied for knights. Then Bishops, then Rooks, then Queens.
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