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Simplify TT PV reduction

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This also removes some incorrect fail-high logic.

Passed STC:
https://tests.stockfishchess.org/tests/view/65cb3b641d8e83c78bfd04a9
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 87968 W: 22634 L: 22468 D: 42866
Ptnml(0-2): 315, 10436, 22323, 10588, 322

Passed LTC:
https://tests.stockfishchess.org/tests/view/65cccee21d8e83c78bfd222c
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 70794 W: 17846 L: 17672 D: 35276
Ptnml(0-2): 44, 7980, 19189, 8126, 58

closes https://github.com/official-stockfish/Stockfish/pull/5055

Bench: 1474424
This commit is contained in:
cj5716 2024-02-13 17:50:16 +08:00 • committed by Disservin
parent 9d61822b5d
commit f3df0cfb84
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@ -1098,9 +1098,9 @@ moves_loop: // When in check, search starts here
thisThread->nodes.fetch_add(1, std::memory_order_relaxed);
pos.do_move(move, st, givesCheck);
// Decrease reduction if position is or has been on the PV (~5 Elo)
// Decrease reduction if position is or has been on the PV (~7 Elo)
if (ss->ttPv)
r -= 1 + (ttValue > alpha) + (ttValue > beta && tte->depth() >= depth);
r -= 1 + (ttValue > alpha) + (tte->depth() >= depth);
// Increase reduction for cut nodes (~4 Elo)
if (cutNode)