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Simplify piece threat calculation

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Passed STC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 105984 W: 27206 L: 27067 D: 51711
Ptnml(0-2): 260, 11556, 29245, 11647, 284
https://tests.stockfishchess.org/tests/view/6914798e7ca87818523317cf

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 53028 W: 13635 L: 13456 D: 25937
Ptnml(0-2): 28, 5184, 15908, 5369, 25
https://tests.stockfishchess.org/tests/view/6918c5fc7ca8781852332312

closes https://github.com/official-stockfish/Stockfish/pull/6459

No functional change
This commit is contained in:
FauziAkram
2025-12-21 15:43:25 +01:00
committed by Disservin
parent 5edfabd070
commit 863c0ec6d0
1 changed files with 3 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/position.cpp
+3 -30
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@@ -1108,35 +1108,8 @@ void Position::update_piece_threats(Piece pc,
const Bitboard rAttacks = attacks_bb<ROOK>(s, occupied); const Bitboard rAttacks = attacks_bb<ROOK>(s, occupied);
const Bitboard bAttacks = attacks_bb<BISHOP>(s, occupied); const Bitboard bAttacks = attacks_bb<BISHOP>(s, occupied);
Bitboard qAttacks = Bitboard(0); Bitboard threatened = attacks_bb(pc, s, occupied) & occupied;
if constexpr (ComputeRay) Bitboard sliders = (rookQueens & rAttacks) | (bishopQueens & bAttacks);
qAttacks = rAttacks | bAttacks;
else if (type_of(pc) == QUEEN)
qAttacks = rAttacks | bAttacks;
Bitboard threatened;
switch (type_of(pc))
{
case PAWN :
threatened = PseudoAttacks[color_of(pc)][s];
break;
case BISHOP :
threatened = bAttacks;
break;
case ROOK :
threatened = rAttacks;
break;
case QUEEN :
threatened = qAttacks;
break;
default :
threatened = PseudoAttacks[type_of(pc)][s];
}
threatened &= occupied;
Bitboard sliders = (rookQueens & rAttacks) | (bishopQueens & bAttacks);
Bitboard incoming_threats = Bitboard incoming_threats =
(PseudoAttacks[KNIGHT][s] & knights) | (attacks_bb<PAWN>(s, WHITE) & blackPawns) (PseudoAttacks[KNIGHT][s] & knights) | (attacks_bb<PAWN>(s, WHITE) & blackPawns)
| (attacks_bb<PAWN>(s, BLACK) & whitePawns) | (PseudoAttacks[KING][s] & kings); | (attacks_bb<PAWN>(s, BLACK) & whitePawns) | (PseudoAttacks[KING][s] & kings);
@@ -1189,7 +1162,7 @@ void Position::update_piece_threats(Piece pc,
Piece slider = piece_on(sliderSq); Piece slider = piece_on(sliderSq);
const Bitboard ray = RayPassBB[sliderSq][s] & ~BetweenBB[sliderSq][s]; const Bitboard ray = RayPassBB[sliderSq][s] & ~BetweenBB[sliderSq][s];
const Bitboard discovered = ray & qAttacks & occupied; const Bitboard discovered = ray & (rAttacks | bAttacks) & occupied;
assert(!more_than_one(discovered)); assert(!more_than_one(discovered));
if (discovered && (RayPassBB[sliderSq][s] & noRaysContaining) != noRaysContaining) if (discovered && (RayPassBB[sliderSq][s] & noRaysContaining) != noRaysContaining)