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Simplify NMP condition

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As this is tried only for cutNode, and all children of cutNodes will be nonCutNodes, the guard condition is redundant.
Simplification just removes the unnecessary condition (always true).

closes https://github.com/official-stockfish/Stockfish/pull/6187

No functional change
This commit is contained in:
Styx
2025-07-28 20:11:40 +02:00
committed by Joost VandeVondele
parent 1d8f118c3e
commit ab83d320b8
2 changed files with 5 additions and 3 deletions
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src/search.cpp
+4 -3
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@@ -856,10 +856,11 @@ Value Search::Worker::search(
}
// Step 9. Null move search with verification search
if (cutNode && (ss - 1)->currentMove != Move::null()
&& ss->staticEval >= beta - 19 * depth + 403 && !excludedMove && pos.non_pawn_material(us)
&& ss->ply >= nmpMinPly && !is_loss(beta))
if (cutNode && ss->staticEval >= beta - 19 * depth + 403 && !excludedMove
&& pos.non_pawn_material(us) && ss->ply >= nmpMinPly && !is_loss(beta))
{
assert((ss - 1)->currentMove != Move::null());
// Null move dynamic reduction based on depth
Depth R = 7 + depth / 3;