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Code Issues Releases Wiki Activity

Penalty for undefended rook as well

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Gary Linscott 2012-03-22 07:33:47 -04:00
parent d4c9abb967
commit f41a21fefd
1 changed files with 11 additions and 9 deletions
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20
src/evaluate.cpp
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@ -167,8 +167,8 @@ namespace {
// happen in Chess960 games. // happen in Chess960 games.
const Score TrappedBishopA1H1Penalty = make_score(100, 100); const Score TrappedBishopA1H1Penalty = make_score(100, 100);
// Penalty for a minor piece that is not defended by anything // Penalty for BNR that is not defended by anything
const Score UndefendedMinorPenalty = make_score(25, 10); const Score UndefendedPiecePenalty = make_score(25, 10);
// The SpaceMask[Color] contains the area of the board which is considered // The SpaceMask[Color] contains the area of the board which is considered
// by the space evaluation. In the middle game, each side is given a bonus // by the space evaluation. In the middle game, each side is given a bonus
@ -682,13 +682,15 @@ Value do_evaluate(const Position& pos, Value& margin) {
Bitboard b; Bitboard b;
Score score = SCORE_ZERO; Score score = SCORE_ZERO;
// Undefended minors get penalized even if not under attack // Undefended pieces get penalized even if not under attack
Bitboard undefended = pos.pieces(Them) Bitboard undefended = pos.pieces(Them) & ~ei.attackedBy[Them][0];
& (pos.pieces(BISHOP) | pos.pieces(KNIGHT)) const Bitboard undefendedMinors = undefended & (pos.pieces(BISHOP) | pos.pieces(KNIGHT));
& ~ei.attackedBy[Them][0];
if (undefended) if (undefendedMinors)
score += single_bit(undefended) ? UndefendedMinorPenalty score += single_bit(undefendedMinors) ? UndefendedPiecePenalty
: UndefendedMinorPenalty * 2; : UndefendedPiecePenalty * 2;
if (undefended & pos.pieces(ROOK))
score += UndefendedPiecePenalty;
// Enemy pieces not defended by a pawn and under our attack // Enemy pieces not defended by a pawn and under our attack
Bitboard weakEnemies = pos.pieces(Them) Bitboard weakEnemies = pos.pieces(Them)