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Use slightly different formula for stat score when position is in check

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Use formula that is closer to movepicker one.

Passed STC:
https://tests.stockfishchess.org/tests/view/67cffb337be98c1ad9b021ee
LLR: 2.99 (-2.94,2.94) <0.00,2.00>
Total: 250432 W: 64978 L: 64343 D: 121111
Ptnml(0-2): 795, 29390, 64159, 30129, 743

Passed LTC:
https://tests.stockfishchess.org/tests/view/67d3905d517865b4a2dfce8a
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 140004 W: 35742 L: 35215 D: 69047
Ptnml(0-2): 60, 15111, 39151, 15602, 78

closes https://github.com/official-stockfish/Stockfish/pull/5930

Bench: 2147336
This commit is contained in:
Michael Chaly
2025-03-16 01:48:49 +03:00
committed by Disservin
parent 652a8874b5
commit 8fc5e92005
1 changed files with 3 additions and 0 deletions
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3
src/search.cpp
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@@ -1235,6 +1235,9 @@ moves_loop: // When in check, search starts here
846 * int(PieceValue[pos.captured_piece()]) / 128
+ thisThread->captureHistory[movedPiece][move.to_sq()][type_of(pos.captured_piece())]
- 4822;
else if (ss->inCheck)
ss->statScore = thisThread->mainHistory[us][move.from_to()]
+ (*contHist[0])[movedPiece][move.to_sq()] - 2771;
else
ss->statScore = 2 * thisThread->mainHistory[us][move.from_to()]
+ (*contHist[0])[movedPiece][move.to_sq()]