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Do second step of shallower search

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Specifically if lmr depth is not lower than new depth and value is really bad.

Passed STC:
https://tests.stockfishchess.org/tests/view/6805444898cd372e3aea0494
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 77664 W: 20136 L: 19762 D: 37766
Ptnml(0-2): 214, 9006, 20039, 9338, 235

Passed LTC:
https://tests.stockfishchess.org/tests/view/680549b298cd372e3aea05ac
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 115458 W: 29447 L: 28971 D: 57040
Ptnml(0-2): 62, 12357, 32421, 12821, 68

closes https://github.com/official-stockfish/Stockfish/pull/6001

bench: 1515501
This commit is contained in:
Michael Chaly
2025-04-26 21:52:36 +02:00
committed by Joost VandeVondele
parent 4176ad7b0a
commit 449a8b017e
1 changed files with 4 additions and 0 deletions
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src/search.cpp
+4
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@@ -1286,7 +1286,11 @@ moves_loop: // When in check, search starts here
update_continuation_histories(ss, movedPiece, move.to_sq(), 1600); update_continuation_histories(ss, movedPiece, move.to_sq(), 1600);
} }
else if (value > alpha && value < bestValue + 9) else if (value > alpha && value < bestValue + 9)
{
newDepth--; newDepth--;
if (value < bestValue + 3)
newDepth--;
}
} }
// Step 18. Full-depth search when LMR is skipped // Step 18. Full-depth search when LMR is skipped