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Bonus for attacked passed pawn promotion path

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Bonus for each attacked square on the promotion path
of an enemy passed pawn.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 141511 W: 25295 L: 24579 D: 91637

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,5.00]
Total: 23161 W: 3022 L: 2831 D: 17308

Bench: 5926706
This commit is contained in:
Stefan Geschwentner 2016-10-27 12:56:32 +02:00 • committed by Marco Costalba
parent 40b1b27178
commit 344616e917
1 changed files with 6 additions and 2 deletions
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8
src/evaluate.cpp
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@ -199,6 +199,7 @@ namespace {
const Score ThreatByPawnPush = S(38, 22); const Score ThreatByPawnPush = S(38, 22);
const Score Unstoppable = S( 0, 20); const Score Unstoppable = S( 0, 20);
const Score PawnlessFlank = S(20, 80); const Score PawnlessFlank = S(20, 80);
const Score HinderPassedPawn = S( 7, 0);
// Penalty for a bishop on a1/h1 (a8/h8 for black) which is trapped by // 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 // a friendly pawn on b2/g2 (b7/g7 for black). This can obviously only
@ -601,7 +602,7 @@ namespace {
const Color Them = (Us == WHITE ? BLACK : WHITE); const Color Them = (Us == WHITE ? BLACK : WHITE);
Bitboard b, squaresToQueen, defendedSquares, unsafeSquares; Bitboard b, bb, squaresToQueen, defendedSquares, unsafeSquares;
Score score = SCORE_ZERO; Score score = SCORE_ZERO;
b = ei.pi->passed_pawns(Us); b = ei.pi->passed_pawns(Us);
@ -613,6 +614,9 @@ namespace {
assert(pos.pawn_passed(Us, s)); assert(pos.pawn_passed(Us, s));
assert(!(pos.pieces(PAWN) & forward_bb(Us, s))); assert(!(pos.pieces(PAWN) & forward_bb(Us, s)));
bb = forward_bb(Us, s) & (ei.attackedBy[Them][ALL_PIECES] | pos.pieces(Them));
score -= HinderPassedPawn * popcount(bb);
int r = relative_rank(Us, s) - RANK_2; int r = relative_rank(Us, s) - RANK_2;
int rr = r * (r - 1); int rr = r * (r - 1);
@ -638,7 +642,7 @@ namespace {
// in the pawn's path attacked or occupied by the enemy. // in the pawn's path attacked or occupied by the enemy.
defendedSquares = unsafeSquares = squaresToQueen = forward_bb(Us, s); defendedSquares = unsafeSquares = squaresToQueen = forward_bb(Us, s);
Bitboard bb = forward_bb(Them, s) & pos.pieces(ROOK, QUEEN) & pos.attacks_from<ROOK>(s); bb = forward_bb(Them, s) & pos.pieces(ROOK, QUEEN) & pos.attacks_from<ROOK>(s);
if (!(pos.pieces(Us) & bb)) if (!(pos.pieces(Us) & bb))
defendedSquares &= ei.attackedBy[Us][ALL_PIECES]; defendedSquares &= ei.attackedBy[Us][ALL_PIECES];