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Tweak futility pruning depth.

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STC https://tests.stockfishchess.org/tests/view/5f2d237161e3b6af64881f43
LLR: 2.96 (-2.94,2.94) {-0.50,1.50}
Total: 12712 W: 1823 L: 1664 D: 9225
Ptnml(0-2): 122, 1166, 3627, 1313, 128

LTC https://tests.stockfishchess.org/tests/view/5f2d473061e3b6af64881f6f
LLR: 2.96 (-2.94,2.94) {0.25,1.75}
Total: 12104 W: 912 L: 788 D: 10404
Ptnml(0-2): 13, 665, 4582, 769, 23

closes https://github.com/official-stockfish/Stockfish/pull/2930

bench: 4271421
This commit is contained in:
Unai Corzo
2020-08-08 08:24:20 +02:00
committed by Joost VandeVondele
parent 857e045ced
commit dc5af66ead
1 changed files with 1 additions and 1 deletions
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2
src/search.cpp
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@@ -816,7 +816,7 @@ namespace {
// Step 8. Futility pruning: child node (~50 Elo)
if ( !PvNode
&& depth < 6
&& depth < 8
&& eval - futility_margin(depth, improving) >= beta
&& eval < VALUE_KNOWN_WIN) // Do not return unproven wins
return eval;