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Tweak late move reductions at root

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More LMR at root, unless a fail low might happen.

passed STC:
 LLR: 2.94 (-2.94,2.94) {-1.00,3.00}
Total: 25428 W: 4960 L: 4789 D: 15679
Ptnml(0-2): 424, 2948, 5832, 3045, 460
http://tests.stockfishchess.org/tests/view/5e1c9afed12216a2857e6401

passed LTC:
 LLR: 2.94 (-2.94,2.94) {0.00,2.00}
Total: 187423 W: 24253 L: 23599 D: 139571
Ptnml(0-2): 1284, 17437, 55536, 18085, 1292
http://tests.stockfishchess.org/tests/view/5e1ceb9975be933c8fe635a3

Closes https://github.com/official-stockfish/Stockfish/pull/2493

Bench: 5156767
This commit is contained in:
Joost VandeVondele
2020-01-13 15:46:40 +01:00
committed by Stéphane Nicolet
parent 7150183d07
commit baf184e8d9
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@@ -1115,7 +1115,7 @@ moves_loop: // When in check, search starts from here
// Step 16. Reduced depth search (LMR, ~200 Elo). If the move fails high it will be // Step 16. Reduced depth search (LMR, ~200 Elo). If the move fails high it will be
// re-searched at full depth. // re-searched at full depth.
if ( depth >= 3 if ( depth >= 3
&& moveCount > 1 + 2 * rootNode && moveCount > 1 + rootNode + (rootNode && bestValue < alpha)
&& (!rootNode || thisThread->best_move_count(move) == 0) && (!rootNode || thisThread->best_move_count(move) == 0)
&& ( !captureOrPromotion && ( !captureOrPromotion
|| moveCountPruning || moveCountPruning