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Rescale pawn history updates

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This patch is somewhat of a continuation of recent pawn history gainers.
It makes pawn history updates after search twice smaller. Since on average they make pawn history more negative offset is changed to lower value to remain average value approximately the same.

https://tests.stockfishchess.org/tests/view/664b3af9830eb9f886614aab
Passed STC:
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 170464 W: 44239 L: 43724 D: 82501
Ptnml(0-2): 523, 20278, 43128, 20767, 536

Passed LTC against pending PR :
https://tests.stockfishchess.org/tests/view/664b8c58830eb9f886614b64
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 98178 W: 25015 L: 24569 D: 48594
Ptnml(0-2): 48, 10769, 27005, 11223, 44

closes https://github.com/official-stockfish/Stockfish/pull/5275

Bench: 1343175
This commit is contained in:
Michael Chaly
2024-05-21 00:40:55 +03:00
committed by Joost VandeVondele
parent b8ccaf038a
commit daf9787de1
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@@ -496,7 +496,7 @@ void Search::Worker::clear() {
counterMoves.fill(Move::none());
mainHistory.fill(0);
captureHistory.fill(0);
pawnHistory.fill(-1100);
pawnHistory.fill(-1300);
correctionHistory.fill(0);
for (bool inCheck : {false, true})
@@ -1827,7 +1827,7 @@ void update_quiet_histories(
update_continuation_histories(ss, pos.moved_piece(move), move.to_sq(), bonus);
int pIndex = pawn_structure_index(pos);
workerThread.pawnHistory[pIndex][pos.moved_piece(move)][move.to_sq()] << bonus;
workerThread.pawnHistory[pIndex][pos.moved_piece(move)][move.to_sq()] << bonus / 2;
}
// Updates move sorting heuristics