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King-pawn threat bonus for endgames.

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STC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 10224 W: 1765 L: 1638 D: 6821

LTC:
LLR: 2.96 (-2.94,2.94) [0.00,6.00]
Total: 6923 W: 1027 L: 899 D: 4997

bench 7818100

Resolves #49
This commit is contained in:
mbootsector 2014-09-19 22:33:42 +08:00 • committed by Gary Linscott
parent aa10d0aaa6
commit 2eec710318
1 changed files with 7 additions and 1 deletions
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8
src/evaluate.cpp
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@ -152,6 +152,8 @@ namespace {
// Hanging contains a bonus for each enemy hanging piece
const Score Hanging = S(23, 20);
const Score KingPawnThreatOne = S(0, 64);
const Score KingPawnThreatMany = S(0, 128);
#undef S
@ -527,7 +529,11 @@ namespace {
b = weakEnemies & ~ei.attackedBy[Them][ALL_PIECES];
if (b)
score += more_than_one(b) ? Hanging * popcount<Max15>(b) : Hanging;
}
b = weakEnemies & pos.pieces(Them, PAWN) & ei.attackedBy[Us][KING];
if (b)
score += more_than_one(b) ? KingPawnThreatMany : KingPawnThreatOne;
}
if (Trace)
Tracing::terms[Us][Tracing::THREAT] = score;