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Tweak return value in futility pruning

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In futility pruning, return the average between eval and beta.

Passed STC:
https://tests.stockfishchess.org/tests/view/65680bb6136acbc5735521d7
LLR: 2.93 (-2.94,2.94) <0.00,2.00>
Total: 15200 W: 3926 L: 3642 D: 7632
Ptnml(0-2): 36, 1699, 3867, 1941, 57

Passed LTC:
https://tests.stockfishchess.org/tests/view/656817fc136acbc573552304
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 200376 W: 49700 L: 49036 D: 101640
Ptnml(0-2): 110, 22584, 54137, 23246, 111

closes https://github.com/official-stockfish/Stockfish/pull/4897

Bench: 1403703
This commit is contained in:
lonfom169 2023-11-30 01:12:19 -03:00 • committed by Disservin
parent 15d47a2b38
commit 08cdbca56f
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -780,7 +780,7 @@ Value search(Position& pos, Stack* ss, Value alpha, Value beta, Depth depth, boo
>= beta
&& eval >= beta && eval < 29462 // smaller than TB wins
&& (!ttMove || ttCapture))
return eval;
return (eval + beta) / 2;
// Step 9. Null move search with verification search (~35 Elo)
if (!PvNode && (ss - 1)->currentMove != MOVE_NULL && (ss - 1)->statScore < 17257 && eval >= beta