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Use NNUE in low piece endgames close to the root.

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This patch enforces that NNUE evaluation is used for endgame positions at shallow depth (depth <= 9).
Classic evaluation will still be used for high imbalance positions when the depth is high or there are many pieces.

Passed STC:
https://tests.stockfishchess.org/tests/view/624c193b3a8a6ac93892dc27
LLR: 2.94 (-2.94,2.94) <0.00,2.50>
Total: 255840 W: 68024 L: 67362 D: 120454
Ptnml(0-2): 1074, 27089, 70926, 27763, 1068

Passed LTC:
https://tests.stockfishchess.org/tests/view/624e8675e9e7821808467f77
LLR: 2.94 (-2.94,2.94) <0.50,3.00>
Total: 67088 W: 17784 L: 17454 D: 31850
Ptnml(0-2): 45, 6209, 20715, 6521, 54

closes https://github.com/official-stockfish/Stockfish/pull/3978

bench: 6602222
This commit is contained in:
Topologist
2022-04-09 08:55:40 +02:00
committed by Joost VandeVondele
parent 9f6bcb38c0
commit 19a90b45bc
3 changed files with 5 additions and 2 deletions
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2
src/thread.h
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@@ -69,7 +69,7 @@ public:
Position rootPos;
StateInfo rootState;
Search::RootMoves rootMoves;
Depth rootDepth, completedDepth;
Depth rootDepth, completedDepth, depth;
Value rootDelta;
CounterMoveHistory counterMoves;
ButterflyHistory mainHistory;