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Introduce double extensions for PV nodes

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Our double/triple extensions were allowed only for non-pv nodes. This
patch allows them to be done for PV nodes, with some stricter
conditions.

Passed STC:
https://tests.stockfishchess.org/tests/view/65d657ec1d8e83c78bfddab8
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 339424 W: 88097 L: 87318 D: 164009
Ptnml(0-2): 1573, 39935, 85729, 41090, 1385

Passed LTC:
https://tests.stockfishchess.org/tests/view/65dd63824b19edc854ebc433
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 459564 W: 115812 L: 114614 D: 229138
Ptnml(0-2): 248, 51441, 125173, 52705, 215

closes https://github.com/official-stockfish/Stockfish/pull/5093

Bench: 1714391
This commit is contained in:
Michael Chaly 2024-03-07 11:57:18 +03:00 • committed by Disservin
parent 1db969e620
commit 6136d094c5
1 changed files with 2 additions and 0 deletions
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2
src/search.cpp
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@ -1042,6 +1042,8 @@ moves_loop: // When in check, search starts here
extension = 2 + (value < singularBeta - 78 && !ttCapture);
depth += depth < 16;
}
if (PvNode && !ttCapture && ss->multipleExtensions <= 5 && value < singularBeta - 50)
extension = 2;
}
// Multi-cut pruning