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Tweak the reduction formula

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Tweak the reduction formula if position is or has been on the PV
Taking inspiration from an old Viren test.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 78528 W: 20607 L: 20225 D: 37696
Ptnml(0-2): 262, 9297, 19785, 9637, 283
https://tests.stockfishchess.org/tests/view/666339c70ff7cb4868d1fe24

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 138630 W: 35666 L: 35132 D: 67832
Ptnml(0-2): 118, 15345, 37835, 15919, 98
https://tests.stockfishchess.org/tests/view/66645dec0612cd151f9e77b0

closes https://github.com/official-stockfish/Stockfish/pull/5385

Bench: 1134281
This commit is contained in:
FauziAkram 2024-06-12 14:04:43 +03:00 • committed by Joost VandeVondele
parent ff10f4ac65
commit 2046c92ad4
1 changed files with 2 additions and 1 deletions
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3
src/search.cpp
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@ -1134,7 +1134,8 @@ moves_loop: // When in check, search starts here
// Decrease reduction if position is or has been on the PV (~7 Elo)
if (ss->ttPv)
r -= 1 + (ttData.value > alpha) + (ttData.depth >= depth);
r -= 1 + (ttData.value > alpha) + (ttData.depth >= depth)
- (PvNode && ttData.value < alpha && ttData.depth >= depth);
// Decrease reduction for PvNodes (~0 Elo on STC, ~2 Elo on LTC)
if (PvNode)