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Pawns count imbalance table

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Instead of having a continuous increasing bonus for our number of pawns when calculating imbalance, use a separate lookup array with tuned values.
Idea by GuardianRM.

STC
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 16155 W: 2980 L: 2787 D: 10388

LTC
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 100478 W: 13055 L: 12615 D: 74808

Bench: 6128779

Closes #1030
This commit is contained in:
joergoster 2017-03-17 14:41:08 -07:00 • committed by Joona Kiiski
parent a6d6a2c2fa
commit c076216a32
1 changed files with 7 additions and 2 deletions
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9
src/material.cpp
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@ -35,7 +35,7 @@ namespace {
// OUR PIECES
// pair pawn knight bishop rook queen
{1667 }, // Bishop pair
{ 40, 2 }, // Pawn
{ 40, 0 }, // Pawn
{ 32, 255, -3 }, // Knight OUR PIECES
{ 0, 104, 4, 0 }, // Bishop
{ -26, -2, 47, 105, -149 }, // Rook
@ -53,6 +53,11 @@ namespace {
{ 101, 100, -37, 141, 268, 0 } // Queen
};
// PawnsSet[count] contains a bonus/malus indexed by number of pawns
const int PawnsSet[9] = {
24, -32, 107, -51, 117, -9, -126, -21, 31
};
// Endgame evaluation and scaling functions are accessed directly and not through
// the function maps because they correspond to more than one material hash key.
Endgame<KXK> EvaluateKXK[] = { Endgame<KXK>(WHITE), Endgame<KXK>(BLACK) };
@ -89,7 +94,7 @@ namespace {
const Color Them = (Us == WHITE ? BLACK : WHITE);
int bonus = 0;
int bonus = PawnsSet[pieceCount[Us][PAWN]];
// Second-degree polynomial material imbalance by Tord Romstad
for (int pt1 = NO_PIECE_TYPE; pt1 <= QUEEN; ++pt1)