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Simplify PvNode Reduction

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Remove the depth condition for PvNode reduction.

Simplification STC:
https://tests.stockfishchess.org/tests/view/64d308fa5b17f7c21c0e0303
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 38976 W: 10106 L: 9889 D: 18981
Ptnml(0-2): 129, 4479, 10040, 4726, 114

Simplification LTC:
https://tests.stockfishchess.org/tests/view/64d457db5b17f7c21c0e236f
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 156402 W: 39727 L: 39645 D: 77030
Ptnml(0-2): 71, 17143, 43696, 17215, 76

closes https://github.com/official-stockfish/Stockfish/pull/4747

Bench: 1493904
This commit is contained in:
Muzhen Gaming 2023-08-13 22:02:17 +08:00 • committed by Disservin
parent 3e5a817fd2
commit fe0dca12f1
1 changed files with 2 additions and 2 deletions
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4
src/search.cpp
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@ -1136,9 +1136,9 @@ moves_loop: // When in check, search starts here
if (ttCapture)
r++;
// Decrease reduction for PvNodes based on depth (~2 Elo)
// Decrease reduction for PvNodes (~2 Elo)
if (PvNode)
r -= 1 + (depth < 6);
r--;
// Decrease reduction if ttMove has been singularly extended (~1 Elo)
if (singularQuietLMR)