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Simplify r50 condition in cutoff

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Passed non-regression STC
LLR: 3.11 (-2.94,2.94) <-1.75,0.25>
Total: 114560 W: 29832 L: 29689 D: 55039
Ptnml(0-2): 332, 12302, 31869, 12445, 332
https://tests.stockfishchess.org/tests/view/68e38587fa806e2e8393d4a9

Passed non-regression LTC
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 256272 W: 65817 L: 65832 D: 124623
Ptnml(0-2): 137, 25528, 76817, 25521, 133
https://tests.stockfishchess.org/tests/view/68e69b47a017f472e763e065

closes https://github.com/official-stockfish/Stockfish/pull/6373

Bench: 2438327
This commit is contained in:
Daniel Monroe
2025-11-01 11:20:23 +01:00
committed by Joost VandeVondele
parent 9e071f3561
commit fd3c563f57
1 changed files with 1 additions and 4 deletions
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src/search.cpp
+1 -4
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@@ -683,10 +683,7 @@ Value Search::Worker::search(
if (!PvNode && !excludedMove && ttData.depth > depth - (ttData.value <= beta)
&& is_valid(ttData.value) // Can happen when !ttHit or when access race in probe()
&& (ttData.bound & (ttData.value >= beta ? BOUND_LOWER : BOUND_UPPER))
&& (cutNode == (ttData.value >= beta) || depth > 5)
// avoid a TT cutoff if the rule50 count is high and the TT move is zeroing
&& (depth > 8 || ttData.move == Move::none() || pos.rule50_count() < 80
|| (!ttCapture && type_of(pos.moved_piece(ttData.move)) != PAWN)))
&& (cutNode == (ttData.value >= beta) || depth > 5))
{
// If ttMove is quiet, update move sorting heuristics on TT hit
if (ttData.move && ttData.value >= beta)