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Simplify reduction on rootNode when bestMoveChanges is high

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The reduction introduced in #3736 also consider on rootNode, so we don't have to reduce again.

STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 28736 W: 7494 L: 7329 D: 13913
Ptnml(0-2): 95, 3247, 7503, 3444, 79
https://tests.stockfishchess.org/tests/view/61a3abe01b7fdf52228e74d8

LTC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 47816 W: 12434 L: 12308 D: 23074
Ptnml(0-2): 37, 4972, 13755, 5116, 28
https://tests.stockfishchess.org/tests/view/61a3c3e39f0c43dae1c71d71

closes https://github.com/official-stockfish/Stockfish/pull/3817

bench: 6331638
This commit is contained in:
bmc4
2021-11-29 09:30:07 -03:00
committed by Joost VandeVondele
parent 4b86ef8c4f
commit 95a2ac1e07
1 changed files with 2 additions and 2 deletions
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src/search.cpp
+2 -2
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@@ -1185,8 +1185,8 @@ moves_loop: // When in check, search starts here
&& !likelyFailLow) && !likelyFailLow)
r -= 2; r -= 2;
// Increase reduction at root and non-PV nodes when the best move does not change frequently // Increase reduction at non-PV nodes when the best move does not change frequently
if ( (rootNode || !PvNode) if ( !PvNode
&& thisThread->bestMoveChanges <= 2) && thisThread->bestMoveChanges <= 2)
r++; r++;