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Tweak reductions for captures/promotions

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From the third move reduce captures and promotions more if remaining depth is low.

STC:
LLR: 2.94 (-2.94,2.94) {-1.00,3.00}
Total: 25218 W: 5008 L: 4837 D: 15373
Ptnml(0-2): 439, 2950, 5717, 3001, 499
http://tests.stockfishchess.org/tests/view/5e1b33abd12216a2857e6359

LTC:
LLR: 2.95 (-2.94,2.94) {0.00,2.00}
Total: 35491 W: 4760 L: 4524 D: 26207
Ptnml(0-2): 264, 3288, 10413, 3460, 294
http://tests.stockfishchess.org/tests/view/5e1b88d5d12216a2857e6385

Closes https://github.com/official-stockfish/Stockfish/pull/2488

Bench: 4979757
This commit is contained in:
Stefan Geschwentner 2020-01-13 11:19:03 +01:00 • committed by Stéphane Nicolet
parent 4901218d4c
commit 7150183d07
1 changed files with 4 additions and 0 deletions
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4
src/search.cpp
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@ -1186,6 +1186,10 @@ moves_loop: // When in check, search starts from here
r -= ss->statScore / 16384; r -= ss->statScore / 16384;
} }
// Increase reduction for captures/promotions if late move and at low depth
else if (depth < 8 && moveCount > 2)
r++;
Depth d = clamp(newDepth - r, 1, newDepth); Depth d = clamp(newDepth - r, 1, newDepth);
value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, true); value = -search<NonPV>(pos, ss+1, -(alpha+1), -alpha, d, true);