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Refine definition of improving

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This patch also allows improving flag to be true if static evaluation of
the position is good enough.

Passed STC:
https://tests.stockfishchess.org/tests/view/6720906086d5ee47d953d4d0
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 34816 W: 9172 L: 8858 D: 16786
Ptnml(0-2): 113, 3988, 8887, 4312, 108

Passed LTC:
https://tests.stockfishchess.org/tests/view/6721162686d5ee47d953d597
LLR: 2.96 (-2.94,2.94) <0.50,2.50>
Total: 145374 W: 37118 L: 36574 D: 71682
Ptnml(0-2): 91, 15875, 40212, 16417, 92

closes https://github.com/official-stockfish/Stockfish/pull/5662

Bench: 1518856
This commit is contained in:
Michael Chaly 2024-11-01 02:04:35 +03:00 • committed by Disservin
parent c2611efe5c
commit ecf5646f6e
1 changed files with 2 additions and 0 deletions
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2
src/search.cpp
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@ -795,6 +795,8 @@ Value Search::Worker::search(
&& eval < VALUE_TB_WIN_IN_MAX_PLY)
return beta + (eval - beta) / 3;
improving |= ss->staticEval >= beta + 100;
// Step 9. Null move search with verification search (~35 Elo)
if (cutNode && (ss - 1)->currentMove != Move::null() && eval >= beta
&& ss->staticEval >= beta - 23 * depth + 400 && !excludedMove && pos.non_pawn_material(us)