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Decrease depth for cutnodes with no tt move

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By analogy to existing logic of decreasing depth for PvNodes w/o tt move
do the same for cutNodes.

Passed STC
https://tests.stockfishchess.org/tests/view/613abf5a689039fce12e1155
LLR: 2.94 (-2.94,2.94) <-0.50,2.50>
Total: 90336 W: 23108 L: 22804 D: 44424
Ptnml(0-2): 286, 10316, 23642, 10656, 268

Passed LTC
https://tests.stockfishchess.org/tests/view/613ae330689039fce12e1172
LLR: 2.94 (-2.94,2.94) <0.50,3.50>
Total: 37736 W: 9607 L: 9346 D: 18783
Ptnml(0-2): 21, 3917, 10730, 4180, 20

closes https://github.com/official-stockfish/Stockfish/pull/3697

bench 5891181
This commit is contained in:
Michael Chaly 2021-09-10 11:38:50 +03:00 • committed by Stéphane Nicolet
parent b7b6b4ba18
commit 30fdbf4328
1 changed files with 6 additions and 1 deletions
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7
src/search.cpp
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@ -903,12 +903,17 @@ namespace {
ss->ttPv = ttPv; ss->ttPv = ttPv;
} }
// Step 10. If the position is not in TT, decrease depth by 2 // Step 10. If the position is not in TT, decrease depth by 2 or 1 depending on node type
if ( PvNode if ( PvNode
&& depth >= 6 && depth >= 6
&& !ttMove) && !ttMove)
depth -= 2; depth -= 2;
if ( cutNode
&& depth >= 9
&& !ttMove)
depth--;
moves_loop: // When in check, search starts here moves_loop: // When in check, search starts here
ttCapture = ttMove && pos.capture_or_promotion(ttMove); ttCapture = ttMove && pos.capture_or_promotion(ttMove);