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Simplify NMP Condition

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Remove eval >= ss->staticEval condition for Null Move Pruning.

Passed non-regression STC:
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 44000 W: 11420 L: 11202 D: 21378
Ptnml(0-2): 174, 5243, 10978, 5401, 204
https://tests.stockfishchess.org/tests/live_elo/6603ee490ec64f0526c57984

Passed non-regression LTC:
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 82956 W: 20978 L: 20818 D: 41160
Ptnml(0-2): 54, 9353, 22499, 9523, 49
https://tests.stockfishchess.org/tests/live_elo/660464b50ec64f0526c5804d

closes https://github.com/official-stockfish/Stockfish/pull/5142

Bench 1759189
This commit is contained in:
Shawn Xu 2024-03-27 02:58:59 -07:00 • committed by Joost VandeVondele
parent 0ef5d05102
commit e13e4cfb83
2 changed files with 3 additions and 2 deletions
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1
AUTHORS
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@ -204,6 +204,7 @@ sf-x
Shahin M. Shahin (peregrine)
Shane Booth (shane31)
Shawn Varghese (xXH4CKST3RXx)
Shawn Xu (xu-shawn)
Siad Daboul (Topologist)
Stefan Geschwentner (locutus2)
Stefano Cardanobile (Stefano80)

4
src/search.cpp
View file

@ -774,8 +774,8 @@ Value Search::Worker::search(
// Step 9. Null move search with verification search (~35 Elo)
if (!PvNode && (ss - 1)->currentMove != Move::null() && (ss - 1)->statScore < 16878
&& eval >= beta && eval >= ss->staticEval && ss->staticEval >= beta - 20 * depth + 314
&& !excludedMove && pos.non_pawn_material(us) && ss->ply >= thisThread->nmpMinPly
&& eval >= beta && ss->staticEval >= beta - 20 * depth + 314 && !excludedMove
&& pos.non_pawn_material(us) && ss->ply >= thisThread->nmpMinPly
&& beta > VALUE_TB_LOSS_IN_MAX_PLY)
{
assert(eval - beta >= 0);