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Zero more redundant coefficients

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Coefficients for Bishop<->BishopPair and Bishop<->Bishop
are also pretty much redundant. By altering the values
in LinearCoefficients[] these coefficients can be zeroed
without changing the imbalance calculations in any position
with less than 3 bishops for one side.

bench: 7995098
This commit is contained in:
Chris Caino
2013-11-04 15:20:17 +00:00
committed by Marco Costalba
parent 1064288b38
commit 53c04c0429
1 changed files with 2 additions and 2 deletions
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4
src/material.cpp
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@@ -39,14 +39,14 @@ namespace {
const Value RedundantRook = Value(554);
// pair pawn knight bishop rook queen
const int LinearCoefficients[6] = { 1824, -162, -1122, -190, 105, 26 };
const int LinearCoefficients[6] = { 1852, -162, -1122, -183, 105, 26 };
const int QuadraticCoefficientsSameColor[][PIECE_TYPE_NB] = {
// pair pawn knight bishop rook queen
{ 0 }, // Bishop pair
{ 39, 2 }, // Pawn
{ 35, 271, -4 }, // Knight
{ 7, 105, 4, 7 }, // Bishop
{ 0, 105, 4, 0 }, // Bishop
{ -27, -2, 46, 100, 56 }, // Rook
{ 58, 29, 83, 148, -3, -25 } // Queen
};