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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 20:47:34 +02:00
committed by Joost VandeVondele
parent ccfa651968
commit 56ea1fadf1
2 changed files with 5 additions and 1 deletions
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src/movepick.cpp
+4
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@@ -186,8 +186,12 @@ void MovePicker::score() {
if (pos.capture_stage(m))
m.value = PieceValue[pos.piece_on(m.to_sq())] + (1 << 28);
else
{
m.value = (*mainHistory)[pos.side_to_move()][m.from_to()]
+ (*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);
}
}
}