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Use qsearch on step 11 if depth is equal to or below 0

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larger reduction of depth if no TT entry is found, and go in qsearch as needed.

stc:
https://tests.stockfishchess.org/tests/view/629dfacd593a4a9b6482db72
LLR: 2.93 (-2.94,2.94) <0.00,2.50>
Total: 31920 W: 8591 L: 8322 D: 15007
Ptnml(0-2): 127, 3551, 8376, 3738, 168

ltc:
https://tests.stockfishchess.org/tests/view/629e304e593a4a9b6482e451
LLR: 2.95 (-2.94,2.94) <0.50,3.00>
Total: 17488 W: 4842 L: 4614 D: 8032
Ptnml(0-2): 13, 1670, 5151, 1896, 14

closes https://github.com/official-stockfish/Stockfish/pull/4056

Bench: 5870283
This commit is contained in:
candirufish 2022-06-07 07:21:43 +02:00 • committed by Joost VandeVondele
parent 809849fa27
commit 00297cfef0
1 changed files with 9 additions and 6 deletions
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15
src/search.cpp
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@ -908,14 +908,17 @@ namespace {
ss->ttPv = ttPv;
}
// Step 11. If the position is not in TT, decrease depth by 2 or 1 depending on node type (~3 Elo)
if ( PvNode
&& depth >= 3
// Step 11. If the position is not in TT, decrease depth by 3.
// Use qsearch if depth is equal or below zero (~4 Elo)
if ( PvNode
&& !ttMove)
depth -= 2;
depth -= 3;
if ( cutNode
&& depth >= 8
if (depth <= 0)
return qsearch<PV>(pos, ss, alpha, beta);
if ( cutNode
&& depth >= 8
&& !ttMove)
depth--;