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Introduce TT Move History Double Extensions

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Passed VVLTC w/ STC bounds:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 74918 W: 19436 L: 19120 D: 36362
Ptnml(0-2): 6, 6890, 23354, 7200, 9
https://tests.stockfishchess.org/tests/view/67e4a1088888403457d878bb

Passed VVLTC w/ LTC bounds:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 111706 W: 29050 L: 28619 D: 54037
Ptnml(0-2): 13, 10218, 34959, 10651, 12
https://tests.stockfishchess.org/tests/view/67d6877c517865b4a2dfd36b

STC Elo Estimate:
Elo: 1.26 ± 2.0 (95%) LOS: 88.8%
Total: 30000 W: 7855 L: 7746 D: 14399
Ptnml(0-2): 104, 3531, 7630, 3622, 113
nElo: 2.44 ± 3.9 (95%) PairsRatio: 1.03
https://tests.stockfishchess.org/tests/view/67eacb8c31d7cf8afdc44b99

closes https://github.com/official-stockfish/Stockfish/pull/5961

Bench: 1887897
This commit is contained in:
Shawn Xu
2025-03-31 21:15:56 -07:00
committed by Disservin
parent d942e13398
commit d7c04a9429
3 changed files with 15 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/history.h
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@@ -166,6 +166,8 @@ struct CorrHistTypedef<NonPawn> {
template<CorrHistType T> template<CorrHistType T>
using CorrectionHistory = typename Detail::CorrHistTypedef<T>::type; using CorrectionHistory = typename Detail::CorrHistTypedef<T>::type;
using TTMoveHistory = Stats<std::int16_t, 8192, PAWN_HISTORY_SIZE, COLOR_NB>;
} // namespace Stockfish } // namespace Stockfish
#endif // #ifndef HISTORY_H_INCLUDED #endif // #ifndef HISTORY_H_INCLUDED

12
src/search.cpp
View File

@@ -580,6 +580,8 @@ void Search::Worker::clear() {
minorPieceCorrectionHistory.fill(0); minorPieceCorrectionHistory.fill(0);
nonPawnCorrectionHistory.fill(0); nonPawnCorrectionHistory.fill(0);
ttMoveHistory.fill(0);
for (auto& to : continuationCorrectionHistory) for (auto& to : continuationCorrectionHistory)
for (auto& h : to) for (auto& h : to)
h.fill(5); h.fill(5);
@@ -1139,7 +1141,8 @@ moves_loop: // When in check, search starts here
{ {
int corrValAdj1 = std::abs(correctionValue) / 248873; int corrValAdj1 = std::abs(correctionValue) / 248873;
int corrValAdj2 = std::abs(correctionValue) / 255331; int corrValAdj2 = std::abs(correctionValue) / 255331;
int doubleMargin = 262 * PvNode - 188 * !ttCapture - corrValAdj1; int doubleMargin = 262 * PvNode - 188 * !ttCapture - corrValAdj1
- ttMoveHistory[pawn_structure_index(pos)][us] / 128;
int tripleMargin = int tripleMargin =
88 + 265 * PvNode - 256 * !ttCapture + 93 * ss->ttPv - corrValAdj2; 88 + 265 * PvNode - 256 * !ttCapture + 93 * ss->ttPv - corrValAdj2;
@@ -1430,8 +1433,15 @@ moves_loop: // When in check, search starts here
// If there is a move that produces search value greater than alpha, // If there is a move that produces search value greater than alpha,
// we update the stats of searched moves. // we update the stats of searched moves.
else if (bestMove) else if (bestMove)
{
update_all_stats(pos, ss, *this, bestMove, prevSq, quietsSearched, capturesSearched, depth, update_all_stats(pos, ss, *this, bestMove, prevSq, quietsSearched, capturesSearched, depth,
bestMove == ttData.move, moveCount); bestMove == ttData.move, moveCount);
if (!PvNode)
{
int bonus = (ttData.move == move) ? 800 : -600 * moveCount;
ttMoveHistory[pawn_structure_index(pos)][us] << bonus;
}
}
// Bonus for prior quiet countermove that caused the fail low // Bonus for prior quiet countermove that caused the fail low
else if (!priorCapture && prevSq != SQ_NONE) else if (!priorCapture && prevSq != SQ_NONE)

2
src/search.h
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@@ -292,6 +292,8 @@ class Worker {
CorrectionHistory<NonPawn> nonPawnCorrectionHistory; CorrectionHistory<NonPawn> nonPawnCorrectionHistory;
CorrectionHistory<Continuation> continuationCorrectionHistory; CorrectionHistory<Continuation> continuationCorrectionHistory;
TTMoveHistory ttMoveHistory;
private: private:
void iterative_deepening(); void iterative_deepening();