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Code Issues Releases Wiki Activity

Reduce When TTValue is Above Alpha

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Passed STC:
LLR: 2.95 (-2.94,2.94) <0.00,2.00>
Total: 53376 W: 13818 L: 13476 D: 26082
Ptnml(0-2): 156, 6212, 13626, 6522, 172
https://tests.stockfishchess.org/tests/view/664aa261830eb9f8866145e5

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 393444 W: 100096 L: 99042 D: 194306
Ptnml(0-2): 191, 43516, 108248, 44582, 185
https://tests.stockfishchess.org/tests/view/664ab54f830eb9f88661463c

closes https://github.com/official-stockfish/Stockfish/pull/5276

Bench: 1024562
This commit is contained in:
Shawn Xu 2024-05-18 03:19:36 -07:00 • committed by Joost VandeVondele
parent daf9787de1
commit f27a9be29c
1 changed files with 5 additions and 1 deletions
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6
src/search.cpp
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@ -42,6 +42,7 @@
#include "thread.h"
#include "timeman.h"
#include "tt.h"
#include "types.h"
#include "uci.h"
#include "ucioption.h"
@ -833,9 +834,12 @@ Value Search::Worker::search(
if (PvNode && !ttMove)
depth -= 3;
if (!PvNode && ss->ttHit && (tte->bound() & BOUND_UPPER) && ttValue > alpha + 5 * depth)
depth--;
// Use qsearch if depth <= 0.
if (depth <= 0)
return qsearch<PV>(pos, ss, alpha, beta);
return qsearch < PvNode ? PV : NonPV > (pos, ss, alpha, beta);
// For cutNodes without a ttMove, we decrease depth by 2 if depth is high enough.
if (cutNode && depth >= 8 && (!ttMove || tte->bound() == BOUND_UPPER))