HCha/Stockfish
1
0
Fork 0
mirror of https://github.com/HChaZZY/Stockfish.git synced 2025-12-20 09:06:45 +08:00
Code Issues Packages Projects Releases Wiki Activity

Bishop pins only

Browse Source
This commit is contained in:
Gary Linscott
2013-02-11 10:26:18 -05:00
parent 57797822f8 733d0099b2
commit a7cdf7299a
17 changed files with 512 additions and 582 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
src/evaluate.cpp
View File

@@ -577,16 +577,15 @@ Value do_evaluate(const Position& pos, Value& margin) {
mobility += MobilityBonus[Piece][mob];
if (Piece == BISHOP && (PseudoAttacks[Piece][pos.king_square(Them)] & s)) {
const Bitboard between = BetweenBB[s][pos.king_square(Them)] & pos.pieces();
if (!more_than_one(between))
score += make_score(25, 25);
}
// Decrease score if we are attacked by an enemy pawn. Remaining part
// of threat evaluation must be done later when we have full attack info.
if (ei.attackedBy[Them][PAWN] & s)
score -= ThreatenedByPawnPenalty[Piece];
else if (Piece == BISHOP && (PseudoAttacks[Piece][pos.king_square(Them)] & s)) {
const Bitboard between = BetweenBB[s][pos.king_square(Them)] & pos.pieces();
if (!more_than_one(between))
score += make_score(15, 25);
}
// Bishop and knight outposts squares
if ( (Piece == BISHOP || Piece == KNIGHT)
@@ -693,7 +692,8 @@ Value do_evaluate(const Position& pos, Value& margin) {
& ~ei.attackedBy[Them][0];
if (undefendedMinors)
score += UndefendedMinorPenalty;
score += more_than_one(undefendedMinors) ? UndefendedMinorPenalty * 2
: UndefendedMinorPenalty;
// Enemy pieces not defended by a pawn and under our attack
weakEnemies = pos.pieces(Them)