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Bonus for loose enemies

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STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 30504 W: 5743 L: 5485 D: 19276

LTC:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 11936 W: 1651 L: 1493 D: 8792

Bench: 8880041

Resolves #606
This commit is contained in:
snicolet
2016-03-27 20:54:39 +01:00
committed by Joona Kiiski
parent 8788612828
commit 24dac5ccd3
1 changed files with 6 additions and 0 deletions
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6
src/evaluate.cpp
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@@ -185,6 +185,7 @@ namespace {
const Score TrappedRook = S(92, 0); const Score TrappedRook = S(92, 0);
const Score Checked = S(20, 20); const Score Checked = S(20, 20);
const Score ThreatByHangingPawn = S(70, 63); const Score ThreatByHangingPawn = S(70, 63);
const Score LooseEnemies = S( 0, 25);
const Score Hanging = S(48, 28); const Score Hanging = S(48, 28);
const Score ThreatByPawnPush = S(31, 19); const Score ThreatByPawnPush = S(31, 19);
const Score Unstoppable = S( 0, 20); const Score Unstoppable = S( 0, 20);
@@ -469,6 +470,11 @@ namespace {
Bitboard b, weak, defended, safeThreats; Bitboard b, weak, defended, safeThreats;
Score score = SCORE_ZERO; Score score = SCORE_ZERO;
// Small bonus if the opponent has loose pawns or pieces
if ( (pos.pieces(Them) ^ pos.pieces(Them, QUEEN, KING))
& ~(ei.attackedBy[Us][ALL_PIECES] | ei.attackedBy[Them][ALL_PIECES]))
score += LooseEnemies;
// Non-pawn enemies attacked by a pawn // Non-pawn enemies attacked by a pawn
weak = (pos.pieces(Them) ^ pos.pieces(Them, PAWN)) & ei.attackedBy[Us][PAWN]; weak = (pos.pieces(Them) ^ pos.pieces(Them, PAWN)) & ei.attackedBy[Us][PAWN];