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Shallow depth pruning on NonPV advanced pawn push

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Usually advanced pawn pushes are not considered in shallow depth pruning
because it is risky to do so with possible promotions near the horizon.
However, this heuristic is not also beneficial on NonPV nodes since we
can afford to take slightly more risk on less important nodes.

STC:
LLR: 2.95 (-2.94,2.94) [-1.50,4.50]
Total: 54530 W: 11955 L: 11686 D: 30889
http://tests.stockfishchess.org/tests/view/5dc7dda30ebc5902ea57efd0

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,3.50]
Total: 77336 W: 12786 L: 12399 D: 52151
http://tests.stockfishchess.org/tests/view/5dc8050d0ebc5902ea57f491

Closes https://github.com/official-stockfish/Stockfish/pull/2408

Bench: 4422068
This commit is contained in:
Miguel Lahoz 2019-11-10 17:49:06 +08:00 • committed by Stéphane Nicolet
parent 44b6697f19
commit 9ab2590963
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@ -1022,7 +1022,7 @@ moves_loop: // When in check, search starts from here
if ( !captureOrPromotion
&& !givesCheck
&& (!pos.advanced_pawn_push(move) || pos.non_pawn_material(~us) > BishopValueMg))
&& (!PvNode || !pos.advanced_pawn_push(move) || pos.non_pawn_material(~us) > BishopValueMg))
{
// Reduced depth of the next LMR search
int lmrDepth = std::max(newDepth - reduction(improving, depth, moveCount), 0);