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Tweak the logic for setting the improving flag

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Tweak the logic for setting the improving flag when the static evaluation is significantly higher than alpha.

Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 92320 W: 24057 L: 23664 D: 44599
Ptnml(0-2): 247, 10689, 23893, 11086, 245
https://tests.stockfishchess.org/tests/view/68860aba966ed85face248a1

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 281292 W: 72496 L: 71683 D: 137113
Ptnml(0-2): 135, 30289, 78995, 31082, 145
https://tests.stockfishchess.org/tests/view/6886168c966ed85face24962

closes https://github.com/official-stockfish/Stockfish/pull/6180

Bench: 3200439
This commit is contained in:
FauziAkram
2025-07-28 19:45:13 +02:00
committed by Joost VandeVondele
parent 402602a70d
commit 4fcfb0b4b7
2 changed files with 8 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/search.cpp
+6 -5
View File
@@ -520,14 +520,15 @@ void Search::Worker::do_move(Position& pos, const Move move, StateInfo& st, Stac
do_move(pos, move, st, pos.gives_check(move), ss);
}
void Search::Worker::do_move(Position& pos, const Move move, StateInfo& st, const bool givesCheck, Stack* const ss) {
bool capture = pos.capture_stage(move);
DirtyPiece dp = pos.do_move(move, st, givesCheck, &tt);
void Search::Worker::do_move(
Position& pos, const Move move, StateInfo& st, const bool givesCheck, Stack* const ss) {
bool capture = pos.capture_stage(move);
DirtyPiece dp = pos.do_move(move, st, givesCheck, &tt);
nodes.fetch_add(1, std::memory_order_relaxed);
accumulatorStack.push(dp);
if (ss != nullptr)
{
ss->currentMove = move;
ss->currentMove = move;
ss->continuationHistory = &continuationHistory[ss->inCheck][capture][dp.pc][move.to_sq()];
ss->continuationCorrectionHistory = &continuationCorrectionHistory[dp.pc][move.to_sq()];
}
@@ -893,7 +894,7 @@ Value Search::Worker::search(
}
}
improving |= ss->staticEval >= beta + 87;
improving |= ss->staticEval >= beta + 94 * !PvNode;
// Step 10. Internal iterative reductions
// At sufficient depth, reduce depth for PV/Cut nodes without a TTMove.
src/search.h
+2 -1
View File
@@ -298,7 +298,8 @@ class Worker {
void iterative_deepening();
void do_move(Position& pos, const Move move, StateInfo& st, Stack* const ss);
void do_move(Position& pos, const Move move, StateInfo& st, const bool givesCheck, Stack* const ss);
void
do_move(Position& pos, const Move move, StateInfo& st, const bool givesCheck, Stack* const ss);
void do_null_move(Position& pos, StateInfo& st);
void undo_move(Position& pos, const Move move);
void undo_null_move(Position& pos);