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Queen vs. Minors imbalance

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Addition of correction values in case of Imbalance of queens,
depending on the number of light pieces on the side without a queen.

Passed patch:

STC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 29036 W: 5379 L: 5130 D: 18527

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 13680 W: 1836 L: 1674 D: 10170

Bench: 6258930

Closes #1155
This commit is contained in:
GuardianRM 2017-07-08 14:07:25 -07:00 • committed by Joona Kiiski
parent 802fca6fdd
commit c8e5384c3a
1 changed files with 10 additions and 0 deletions
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10
src/material.cpp
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@ -58,6 +58,12 @@ namespace {
24, -32, 107, -51, 117, -9, -126, -21, 31 24, -32, 107, -51, 117, -9, -126, -21, 31
}; };
// QueenMinorsImbalance[opp_minor_count] is applied when only one side has a queen.
// It contains a bonus/malus for the side with the queen.
const int QueenMinorsImbalance[16] = {
31, -8, -15, -25, -5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
// Endgame evaluation and scaling functions are accessed directly and not through // Endgame evaluation and scaling functions are accessed directly and not through
// the function maps because they correspond to more than one material hash key. // the function maps because they correspond to more than one material hash key.
Endgame<KXK> EvaluateKXK[] = { Endgame<KXK>(WHITE), Endgame<KXK>(BLACK) }; Endgame<KXK> EvaluateKXK[] = { Endgame<KXK>(WHITE), Endgame<KXK>(BLACK) };
@ -111,6 +117,10 @@ namespace {
bonus += pieceCount[Us][pt1] * v; bonus += pieceCount[Us][pt1] * v;
} }
// Special handling of Queen vs. Minors
if (pieceCount[Us][QUEEN] == 1 && pieceCount[Them][QUEEN] == 0)
bonus += QueenMinorsImbalance[pieceCount[Them][KNIGHT] + pieceCount[Them][BISHOP]];
return bonus; return bonus;
} }