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Simplify ThreatBySafePawn scoring

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Bench: 6197938

Closes #1047
This commit is contained in:
joergoster 2017-03-25 10:21:24 -07:00 • committed by Joona Kiiski
parent 30c583204f
commit afe75571d8
1 changed files with 15 additions and 21 deletions
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36
src/evaluate.cpp
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@ -146,12 +146,6 @@ namespace {
// friendly pawn on the rook file.
const Score RookOnFile[2] = { S(20, 7), S(45, 20) };
// ThreatBySafePawn[PieceType] contains bonuses according to which piece
// type is attacked by a pawn which is protected or is not attacked.
const Score ThreatBySafePawn[PIECE_TYPE_NB] = {
S(0, 0), S(0, 0), S(176, 139), S(131, 127), S(217, 218), S(203, 215)
};
// ThreatByMinor/ByRook[attacked PieceType] contains bonuses according to
// which piece type attacks which one. Attacks on lesser pieces which are
// pawn-defended are not considered.
@ -190,19 +184,20 @@ namespace {
};
// Assorted bonuses and penalties used by evaluation
const Score MinorBehindPawn = S(16, 0);
const Score BishopPawns = S( 8, 12);
const Score RookOnPawn = S( 8, 24);
const Score TrappedRook = S(92, 0);
const Score WeakQueen = S(50, 10);
const Score OtherCheck = S(10, 10);
const Score CloseEnemies = S( 7, 0);
const Score PawnlessFlank = S(20, 80);
const Score ThreatByHangingPawn = S(71, 61);
const Score ThreatByRank = S(16, 3);
const Score Hanging = S(48, 27);
const Score ThreatByPawnPush = S(38, 22);
const Score HinderPassedPawn = S( 7, 0);
const Score MinorBehindPawn = S( 16, 0);
const Score BishopPawns = S( 8, 12);
const Score RookOnPawn = S( 8, 24);
const Score TrappedRook = S( 92, 0);
const Score WeakQueen = S( 50, 10);
const Score OtherCheck = S( 10, 10);
const Score CloseEnemies = S( 7, 0);
const Score PawnlessFlank = S( 20, 80);
const Score ThreatByHangingPawn = S( 71, 61);
const Score ThreatBySafePawn = S(182,175);
const Score ThreatByRank = S( 16, 3);
const Score Hanging = S( 48, 27);
const Score ThreatByPawnPush = S( 38, 22);
const Score HinderPassedPawn = S( 7, 0);
// Penalty for a bishop on a1/h1 (a8/h8 for black) which is trapped by
// a friendly pawn on b2/g2 (b7/g7 for black). This can obviously only
@ -539,8 +534,7 @@ namespace {
if (weak ^ safeThreats)
score += ThreatByHangingPawn;
while (safeThreats)
score += ThreatBySafePawn[type_of(pos.piece_on(pop_lsb(&safeThreats)))];
score += ThreatBySafePawn * popcount(safeThreats);
}
// Squares strongly protected by the opponent, either because they attack the