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Simplify Away Negative Extension

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This patch simplifies away the negative extension applied when the value returned by the transposition table is assumed to fail low over the value of reduced search.

Passed STC:
LLR: 2.99 (-2.94,2.94) <-1.75,0.25>
Total: 248736 W: 64293 L: 64302 D: 120141
Ptnml(0-2): 925, 29833, 62831, 29884, 895
https://tests.stockfishchess.org/tests/view/663bee3bca93dad645f7f64a

Passed LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 254970 W: 64289 L: 64308 D: 126373
Ptnml(0-2): 110, 28428, 70422, 28421, 104
https://tests.stockfishchess.org/tests/view/663c11f0c0b75d7f7b97d4bb

closes https://github.com/official-stockfish/Stockfish/pull/5226

Bench: 2353057
This commit is contained in:
Shawn Xu 2024-05-08 14:26:01 -07:00 • committed by Joost VandeVondele
parent 574ad14b32
commit c43425b0b1
1 changed files with 0 additions and 4 deletions
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4
src/search.cpp
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@ -1087,10 +1087,6 @@ 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)
else if (cutNode)
extension = -2;
// If the ttMove is assumed to fail low over the value of the reduced search (~1 Elo)
else if (ttValue <= value)
extension = -1;
}
// Extension for capturing the previous moved piece (~0 Elo on STC, ~1 Elo on LTC)