jirayu_sri/stockfish
1
0
Fork 0
mirror of https://github.com/official-stockfish/Stockfish.git synced 2026-07-22 20:57:10 +00:00
Code Issues Packages Projects Releases Wiki Activity

Merge commit 'aff1f67997cd2584ea7c82d967ac7bfd4cc77861' into cluster

Browse Source 
This is the last commit before there are more conflicts.
This commit is contained in:
Steinar H. Gunderson
2025-12-25 16:59:53 +01:00
parent e8bc8639fc aff1f67997
commit fa1ab27e15
2 changed files with 18 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+15 -19
View File
@@ -89,7 +89,8 @@ Value to_corrected_static_eval(Value v, const Worker& w, const Position& pos) {
const auto wnpcv = w.nonPawnCorrectionHistory[WHITE][us][non_pawn_index<WHITE>(pos)];
const auto bnpcv = w.nonPawnCorrectionHistory[BLACK][us][non_pawn_index<BLACK>(pos)];
const auto cv =
(98198 * pcv + 68968 * mcv + 54353 * macv + 85174 * micv + 85581 * (wnpcv + bnpcv)) / 2097152;
(99916 * pcv + 55067 * mcv + 55530 * macv + 95324 * micv + 105056 * (wnpcv + bnpcv))
/ 2097152;
v += cv;
return std::clamp(v, VALUE_TB_LOSS_IN_MAX_PLY + 1, VALUE_TB_WIN_IN_MAX_PLY - 1);
}
@@ -1461,12 +1462,15 @@ moves_loop: // When in check, search starts here
{
auto bonus = std::clamp(int(bestValue - ss->staticEval) * depth / 8,
-CORRECTION_HISTORY_LIMIT / 4, CORRECTION_HISTORY_LIMIT / 4);
thisThread->pawnCorrectionHistory[us][pawn_structure_index<Correction>(pos)] << bonus;
thisThread->materialCorrectionHistory[us][material_index(pos)] << bonus;
thisThread->majorPieceCorrectionHistory[us][major_piece_index(pos)] << bonus;
thisThread->minorPieceCorrectionHistory[us][minor_piece_index(pos)] << bonus;
thisThread->nonPawnCorrectionHistory[WHITE][us][non_pawn_index<WHITE>(pos)] << bonus;
thisThread->nonPawnCorrectionHistory[BLACK][us][non_pawn_index<BLACK>(pos)] << bonus;
thisThread->pawnCorrectionHistory[us][pawn_structure_index<Correction>(pos)]
<< bonus * 101 / 128;
thisThread->materialCorrectionHistory[us][material_index(pos)] << bonus * 99 / 128;
thisThread->majorPieceCorrectionHistory[us][major_piece_index(pos)] << bonus * 157 / 128;
thisThread->minorPieceCorrectionHistory[us][minor_piece_index(pos)] << bonus * 153 / 128;
thisThread->nonPawnCorrectionHistory[WHITE][us][non_pawn_index<WHITE>(pos)]
<< bonus * 123 / 128;
thisThread->nonPawnCorrectionHistory[BLACK][us][non_pawn_index<BLACK>(pos)]
<< bonus * 165 / 128;
}
assert(bestValue > -VALUE_INFINITE && bestValue < VALUE_INFINITE);
@@ -1646,19 +1650,11 @@ Value Search::Worker::qsearch(Position& pos, Stack* ss, Value alpha, Value beta)
continue;
}
// If static eval is much lower than alpha and move is
// not winning material, we can prune this move. (~2 Elo)
if (futilityBase <= alpha && !pos.see_ge(move, 1))
// if static exchange evaluation is low enough
// we can prune this move. (~2 Elo)
if (!pos.see_ge(move, alpha - futilityBase))
{
bestValue = std::max(bestValue, futilityBase);
continue;
}
// If static exchange evaluation is much worse than what
// is needed to not fall below alpha, we can prune this move.
if (futilityBase > alpha && !pos.see_ge(move, (alpha - futilityBase) * 4))
{
bestValue = alpha;
bestValue = (futilityBase > alpha) ? alpha : std::max(bestValue, futilityBase);
continue;
}
}