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Refactor root history into low ply history

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This patch changes root history to low ply history - butterfly history for plies < 4.
Doubles weight of this history for root, latter plies have lesser effect.

Passed STC:
https://tests.stockfishchess.org/tests/view/66f77d2386d5ee47d953b65d
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 180992 W: 47362 L: 46830 D: 86800
Ptnml(0-2): 554, 21499, 45928, 21891, 624

Passed LTC:
https://tests.stockfishchess.org/tests/view/66fb557986d5ee47d953b8e5
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 42462 W: 11013 L: 10682 D: 20767
Ptnml(0-2): 33, 4518, 11795, 4855, 30

closes https://github.com/official-stockfish/Stockfish/pull/5614

Bench 1264335
This commit is contained in:
Michael Chaly
2024-10-02 10:49:23 +03:00
committed by Joost VandeVondele
parent 0186904f53
commit 7ac745a736
4 changed files with 40 additions and 48 deletions
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src/search.h
+1 -1
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@@ -278,7 +278,7 @@ class Worker {
// Public because they need to be updatable by the stats
ButterflyHistory mainHistory;
ButterflyHistory rootHistory;
LowPlyHistory lowPlyHistory;
CapturePieceToHistory captureHistory;
ContinuationHistory continuationHistory[2][2];