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Simplify away main history default

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Passed non-regression STC
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 130752 W: 33725 L: 33605 D: 63422
Ptnml(0-2): 421, 15472, 33460, 15612, 411
https://tests.stockfishchess.org/tests/view/697eb9e35f56030af97b5a9e

Passed non-regression LTC
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 53352 W: 13697 L: 13509 D: 26146
Ptnml(0-2): 36, 5804, 14811, 5986, 39
https://tests.stockfishchess.org/tests/view/6980e5846362aee5c8a55396

closes https://github.com/official-stockfish/Stockfish/pull/6590

Bench: 2375860
This commit is contained in:
Daniel Monroe
2026-02-08 15:22:29 +01:00
committed by Disservin
parent 6b6334ce8e
commit 21b0974f8d
1 changed files with 2 additions and 4 deletions
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src/search.cpp
+2 -4
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@@ -65,7 +65,6 @@ using namespace Search;
namespace { namespace {
constexpr int SEARCHEDLIST_CAPACITY = 32; constexpr int SEARCHEDLIST_CAPACITY = 32;
constexpr int mainHistoryDefault = 68;
using SearchedList = ValueList<Move, SEARCHEDLIST_CAPACITY>; using SearchedList = ValueList<Move, SEARCHEDLIST_CAPACITY>;
// (*Scalers): // (*Scalers):
@@ -316,8 +315,7 @@ void Search::Worker::iterative_deepening() {
for (Color c : {WHITE, BLACK}) for (Color c : {WHITE, BLACK})
for (int i = 0; i < UINT_16_HISTORY_SIZE; i++) for (int i = 0; i < UINT_16_HISTORY_SIZE; i++)
mainHistory[c][i] = mainHistory[c][i] = mainHistory[c][i] * 3 / 4;
(mainHistory[c][i] - mainHistoryDefault) * 3 / 4 + mainHistoryDefault;
// Iterative deepening loop until requested to stop or the target depth is reached // Iterative deepening loop until requested to stop or the target depth is reached
while (++rootDepth < MAX_PLY && !threads.stop while (++rootDepth < MAX_PLY && !threads.stop
@@ -585,7 +583,7 @@ void Search::Worker::undo_null_move(Position& pos) { pos.undo_null_move(); }
// Reset histories, usually before a new game // Reset histories, usually before a new game
void Search::Worker::clear() { void Search::Worker::clear() {
mainHistory.fill(mainHistoryDefault); mainHistory.fill(0);
captureHistory.fill(-689); captureHistory.fill(-689);
// Each thread is responsible for clearing their part of shared history // Each thread is responsible for clearing their part of shared history