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Tweak low ply history

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Increase low ply history maximum ply by 1 and also allow to use it for check evasions scoring.

Pased STC:
https://tests.stockfishchess.org/tests/view/682a2db36ec7634154f9a358
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 66464 W: 17440 L: 17081 D: 31943
Ptnml(0-2): 191, 7717, 17056, 8078, 190

Passed LTC:
https://tests.stockfishchess.org/tests/view/682a3d406ec7634154f9a39c
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 384030 W: 98476 L: 97452 D: 188102
Ptnml(0-2): 180, 41564, 107522, 42550, 199

closes https://github.com/official-stockfish/Stockfish/pull/6075

Bench: 2422771
This commit is contained in:
Michael Chaly
2025-05-19 11:42:45 +03:00
committed by Joost VandeVondele
parent ccfa651968
commit 56ea1fadf1
2 changed files with 5 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/history.h
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@@ -36,7 +36,7 @@ namespace Stockfish {
constexpr int PAWN_HISTORY_SIZE = 512; // has to be a power of 2 constexpr int PAWN_HISTORY_SIZE = 512; // has to be a power of 2
constexpr int CORRECTION_HISTORY_SIZE = 32768; // has to be a power of 2 constexpr int CORRECTION_HISTORY_SIZE = 32768; // has to be a power of 2
constexpr int CORRECTION_HISTORY_LIMIT = 1024; constexpr int CORRECTION_HISTORY_LIMIT = 1024;
constexpr int LOW_PLY_HISTORY_SIZE = 4; constexpr int LOW_PLY_HISTORY_SIZE = 5;
static_assert((PAWN_HISTORY_SIZE & (PAWN_HISTORY_SIZE - 1)) == 0, static_assert((PAWN_HISTORY_SIZE & (PAWN_HISTORY_SIZE - 1)) == 0,
"PAWN_HISTORY_SIZE has to be a power of 2"); "PAWN_HISTORY_SIZE has to be a power of 2");

4
src/movepick.cpp
View File

@@ -186,8 +186,12 @@ void MovePicker::score() {
if (pos.capture_stage(m)) if (pos.capture_stage(m))
m.value = PieceValue[pos.piece_on(m.to_sq())] + (1 << 28); m.value = PieceValue[pos.piece_on(m.to_sq())] + (1 << 28);
else else
{
m.value = (*mainHistory)[pos.side_to_move()][m.from_to()] m.value = (*mainHistory)[pos.side_to_move()][m.from_to()]
+ (*continuationHistory[0])[pos.moved_piece(m)][m.to_sq()]; + (*continuationHistory[0])[pos.moved_piece(m)][m.to_sq()];
if (ply < LOW_PLY_HISTORY_SIZE)
m.value += 2 * (*lowPlyHistory)[ply][m.from_to()] / (1 + ply);
}
} }
} }