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Increase reduction at root

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when the best move does not change frequently

STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 51320 W: 5159 L: 4956 D: 41205
Ptnml(0-2): 215, 3897, 17242, 4082, 224
https://tests.stockfishchess.org/tests/view/5faa072367cbf42301d6a767

LTC:
LLR: 2.98 (-2.94,2.94) {0.25,1.25}
Total: 15952 W: 762 L: 642 D: 14548
Ptnml(0-2): 8, 561, 6725, 667, 15
https://tests.stockfishchess.org/tests/view/5faa4c3567cbf42301d6a794

closes https://github.com/official-stockfish/Stockfish/pull/3225

Bench: 3954692
This commit is contained in:
SFisGOD 2020-11-10 18:28:43 +01:00 • committed by Stéphane Nicolet
parent b5781150ea
commit 285bf7041a
2 changed files with 4 additions and 3 deletions
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2
AUTHORS
View file

@ -86,7 +86,7 @@ Jekaa
Jerry Donald Watson (jerrydonaldwatson) Jerry Donald Watson (jerrydonaldwatson)
jjoshua2 jjoshua2
Jonathan Calovski (Mysseno) Jonathan Calovski (Mysseno)
Jonathan Dumale (SFisGOD) Jonathan Buladas Dumale (SFisGOD)
Joost VandeVondele (vondele) Joost VandeVondele (vondele)
Jörg Oster (joergoster) Jörg Oster (joergoster)
Joseph Ellis (jhellis3) Joseph Ellis (jhellis3)

5
src/search.cpp
View file

@ -1161,7 +1161,7 @@ moves_loop: // When in check, search starts from here
if (thisThread->ttHitAverage > 509 * TtHitAverageResolution * TtHitAverageWindow / 1024) if (thisThread->ttHitAverage > 509 * TtHitAverageResolution * TtHitAverageWindow / 1024)
r--; r--;
// Reduction if other threads are searching this position // Increase reduction if other threads are searching this position
if (th.marked()) if (th.marked())
r++; r++;
@ -1169,7 +1169,8 @@ moves_loop: // When in check, search starts from here
if (ss->ttPv) if (ss->ttPv)
r -= 2; r -= 2;
if (!PvNode && depth > 10 && thisThread->bestMoveChanges <= 2) // Increase reduction at root and non-PV nodes when the best move does not change frequently
if ((rootNode || !PvNode) && depth > 10 && thisThread->bestMoveChanges <= 2)
r++; r++;
if (moveCountPruning && !formerPv) if (moveCountPruning && !formerPv)