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Modify ttPV reduction

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This patch modifies ttPV reduction by reducing 1 more unless ttValue is above alpha.

Inspired from @pb00068 https://tests.stockfishchess.org/tests/view/658060796a3b4f6202215f1f

Passed STC:
https://tests.stockfishchess.org/tests/view/6591867679aa8af82b958328
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 37856 W: 9727 L: 9407 D: 18722
Ptnml(0-2): 99, 4444, 9568, 4672, 145

Passed LTC:
https://tests.stockfishchess.org/tests/view/6591d9b679aa8af82b958a6c
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 128256 W: 32152 L: 31639 D: 64465
Ptnml(0-2): 64, 14364, 34772, 14851, 77

closes https://github.com/official-stockfish/Stockfish/pull/4957

Bench: 1176235
This commit is contained in:
Viren6 2024-01-02 02:54:45 +00:00 • committed by Disservin
parent 5546bc0a26
commit 28f8663f39
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1152,7 +1152,7 @@ moves_loop: // When in check, search starts here
// Decrease reduction if position is or has been on the PV (~4 Elo)
if (ss->ttPv && !likelyFailLow)
r -= cutNode && tte->depth() >= depth ? 3 : 2;
r -= 1 + (cutNode && tte->depth() >= depth) + (ttValue > alpha);
// Decrease reduction if opponent's move count is high (~1 Elo)
if ((ss - 1)->moveCount > 7)