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Do more aggressive pawn history updates

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Tweak of recent patch that made pawn history to update for move that caused a fail low - and setting up default value of it to -900.  This patch makes it more aggressive - twice bigger updates and default value -1100.

Passed STC:
https://tests.stockfishchess.org/tests/view/6648c5d4308cceea45533b5d
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 235200 W: 61090 L: 60476 D: 113634
Ptnml(0-2): 763, 27952, 59651, 28376, 858

Passed LTC:
https://tests.stockfishchess.org/tests/view/664a1008ae57c1758ac5b523
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 20076 W: 5193 L: 4908 D: 9975
Ptnml(0-2): 7, 2105, 5534, 2380, 12

closes https://github.com/official-stockfish/Stockfish/pull/5268

Bench: 1590474
This commit is contained in:
Michael Chaly 2024-05-19 18:48:43 +03:00 • committed by Joost VandeVondele
parent a3bb7e626d
commit 4a66a7c9ca
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()); counterMoves.fill(Move::none());
mainHistory.fill(0); mainHistory.fill(0);
captureHistory.fill(0); captureHistory.fill(0);
pawnHistory.fill(-900); pawnHistory.fill(-1100);
correctionHistory.fill(0); correctionHistory.fill(0);
for (bool inCheck : {false, true}) for (bool inCheck : {false, true})
@ -1339,7 +1339,7 @@ moves_loop: // When in check, search starts here
if (type_of(pos.piece_on(prevSq)) != PAWN && ((ss - 1)->currentMove).type_of() != PROMOTION) if (type_of(pos.piece_on(prevSq)) != PAWN && ((ss - 1)->currentMove).type_of() != PROMOTION)
thisThread->pawnHistory[pawn_structure_index(pos)][pos.piece_on(prevSq)][prevSq] thisThread->pawnHistory[pawn_structure_index(pos)][pos.piece_on(prevSq)][prevSq]
<< stat_bonus(depth) * bonus * 2; << stat_bonus(depth) * bonus * 4;
} }
if (PvNode) if (PvNode)