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Make Pv search shallower in some cases

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Conditions are the same as they are for doShallowerSearch, just that
they also apply for cases where LMR wasn't reducing anything - if result
is bad enough reduce search depth of PV search by 1.

Passed STC:
https://tests.stockfishchess.org/tests/view/67b9d2aca49c651c2caac818
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 29216 W: 7731 L: 7424 D: 14061
Ptnml(0-2): 87, 3345, 7473, 3580, 123

Passed LTC:
https://tests.stockfishchess.org/tests/view/67ba538c01f3463ae1d35e69
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 33168 W: 8529 L: 8219 D: 16420
Ptnml(0-2): 12, 3505, 9262, 3771, 34

closes https://github.com/official-stockfish/Stockfish/pull/5895

Bench: 2290732
This commit is contained in:
Michael Chaly
2025-02-23 19:52:37 +03:00
committed by Disservin
parent 57f0fe08c0
commit c19a6ea53c
1 changed files with 2 additions and 0 deletions
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2
src/search.cpp
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@@ -1260,6 +1260,8 @@ moves_loop: // When in check, search starts here
int bonus = (value >= beta) * 2010;
update_continuation_histories(ss, movedPiece, move.to_sq(), bonus);
}
else if (value > alpha && value < bestValue + 9)
newDepth--;
}
// Step 18. Full-depth search when LMR is skipped