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Simplify the extension formula

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Simplify the extension formula in the case of cutNode by removing the depth condition and always setting extension to -2.

Passed STC:
LLR: 2.97 (-2.94,2.94) <-1.75,0.25>
Total: 277280 W: 70760 L: 70802 D: 135718
Ptnml(0-2): 971, 31775, 73153, 31807, 934
https://tests.stockfishchess.org/tests/view/65ad08f779aa8af82b979dd6

Passed LTC:
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 452976 W: 112992 L: 113215 D: 226769
Ptnml(0-2): 266, 51041, 124112, 50788, 281
https://tests.stockfishchess.org/tests/view/65ae466fc865510db026a760

closes https://github.com/official-stockfish/Stockfish/pull/5021

Bench: 1492957
This commit is contained in:
FauziAkram 2024-01-27 21:55:00 +03:00 • committed by Joost VandeVondele
parent 3cce4c4cf4
commit 56b342f9b2
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1065,7 +1065,7 @@ moves_loop: // When in check, search starts here
// If we are on a cutNode but the ttMove is not assumed to fail high over current beta (~1 Elo) // If we are on a cutNode but the ttMove is not assumed to fail high over current beta (~1 Elo)
else if (cutNode) else if (cutNode)
extension = depth < 20 ? -2 : -1; extension = -2;
// If the ttMove is assumed to fail low over the value of the reduced search (~1 Elo) // If the ttMove is assumed to fail low over the value of the reduced search (~1 Elo)
else if (ttValue <= value) else if (ttValue <= value)