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Pins or discovered attacks on the opponent's queen

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Bonus for pins or discovered attacks on the opponent's queen

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 32020 W: 5914 L: 5652 D: 20454

LTC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 10946 W: 1530 L: 1375 D: 8041

Bench: 7031649
This commit is contained in:
Stéphane Nicolet 2016-05-21 10:05:19 +02:00 • committed by Marco Costalba
parent abac509ccb
commit 07b247f943
1 changed files with 8 additions and 0 deletions
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8
src/evaluate.cpp
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@ -187,6 +187,7 @@ namespace {
const Score OtherCheck = S(10, 10);
const Score ThreatByHangingPawn = S(71, 61);
const Score LooseEnemies = S( 0, 25);
const Score WeakQueen = S(35, 0);
const Score Hanging = S(48, 27);
const Score ThreatByPawnPush = S(38, 22);
const Score Unstoppable = S( 0, 20);
@ -488,6 +489,13 @@ namespace {
& ~(ei.attackedBy[Us][ALL_PIECES] | ei.attackedBy[Them][ALL_PIECES]))
score += LooseEnemies;
// Bonus for pin or discovered attack on the opponent queen
if ( pos.count<QUEEN>(Them) == 1
&& pos.slider_blockers(pos.pieces(),
pos.pieces(Us, ROOK, BISHOP),
pos.square<QUEEN>(Them)))
score += WeakQueen;
// Non-pawn enemies attacked by a pawn
weak = (pos.pieces(Them) ^ pos.pieces(Them, PAWN)) & ei.attackedBy[Us][PAWN];