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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
Download Patch File Download Diff File Expand all files Collapse all files
src/movepick.h
+8 -4
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@@ -135,6 +135,10 @@ enum StatsType {
// see https://www.chessprogramming.org/Butterfly_Boards (~11 elo)
using ButterflyHistory = Stats<int16_t, 7183, COLOR_NB, int(SQUARE_NB) * int(SQUARE_NB)>;
// LowPlyHistory is adressed by play and move's from and to squares, used
// to improve move ordering near the root
using LowPlyHistory = Stats<int16_t, 7183, 4, int(SQUARE_NB) * int(SQUARE_NB)>;
// CapturePieceToHistory is addressed by a move's [piece][to][captured piece type]
using CapturePieceToHistory = Stats<int16_t, 10692, PIECE_NB, SQUARE_NB, PIECE_TYPE_NB>;
@@ -195,11 +199,11 @@ class MovePicker {
Move,
Depth,
const ButterflyHistory*,
const ButterflyHistory*,
const LowPlyHistory*,
const CapturePieceToHistory*,
const PieceToHistory**,
const PawnHistory*,
bool);
int);
MovePicker(const Position&, Move, int, const CapturePieceToHistory*);
Move next_move(bool skipQuiets = false);
@@ -213,7 +217,7 @@ class MovePicker {
const Position& pos;
const ButterflyHistory* mainHistory;
const ButterflyHistory* rootHistory;
const LowPlyHistory* lowPlyHistory;
const CapturePieceToHistory* captureHistory;
const PieceToHistory** continuationHistory;
const PawnHistory* pawnHistory;
@@ -222,7 +226,7 @@ class MovePicker {
int stage;
int threshold;
Depth depth;
bool rootNode;
int ply;
ExtMove moves[MAX_MOVES];
};