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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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4
src/evaluate.cpp
View file

@ -1088,7 +1088,8 @@ Value Eval::evaluate(const Position& pos) {
// Deciding between classical and NNUE eval (~10 Elo): for high PSQ imbalance we use classical, // Deciding between classical and NNUE eval (~10 Elo): for high PSQ imbalance we use classical,
// but we switch to NNUE during long shuffling or with high material on the board. // but we switch to NNUE during long shuffling or with high material on the board.
if ( !useNNUE if ( !useNNUE
|| abs(eg_value(pos.psq_score())) * 5 > (856 + pos.non_pawn_material() / 64) * (5 + pos.rule50_count())) || ((pos.this_thread()->depth > 9 || pos.count<ALL_PIECES>() > 7) &&
abs(eg_value(pos.psq_score())) * 5 > (856 + pos.non_pawn_material() / 64) * (5 + pos.rule50_count())))
{ {
v = Evaluation<NO_TRACE>(pos).value(); // classical v = Evaluation<NO_TRACE>(pos).value(); // classical
useClassical = abs(v) >= 297; useClassical = abs(v) >= 297;
@ -1138,6 +1139,7 @@ std::string Eval::trace(Position& pos) {
std::memset(scores, 0, sizeof(scores)); std::memset(scores, 0, sizeof(scores));
// Reset any global variable used in eval // Reset any global variable used in eval
pos.this_thread()->depth = 0;
pos.this_thread()->trend = SCORE_ZERO; pos.this_thread()->trend = SCORE_ZERO;
pos.this_thread()->bestValue = VALUE_ZERO; pos.this_thread()->bestValue = VALUE_ZERO;
pos.this_thread()->optimism[WHITE] = VALUE_ZERO; pos.this_thread()->optimism[WHITE] = VALUE_ZERO;

1
src/search.cpp
View file

@ -560,6 +560,7 @@ namespace {
// Step 1. Initialize node // Step 1. Initialize node
Thread* thisThread = pos.this_thread(); Thread* thisThread = pos.this_thread();
thisThread->depth = depth;
ss->inCheck = pos.checkers(); ss->inCheck = pos.checkers();
priorCapture = pos.captured_piece(); priorCapture = pos.captured_piece();
Color us = pos.side_to_move(); Color us = pos.side_to_move();

2
src/thread.h
View file

@ -69,7 +69,7 @@ public:
Position rootPos; Position rootPos;
StateInfo rootState; StateInfo rootState;
Search::RootMoves rootMoves; Search::RootMoves rootMoves;
Depth rootDepth, completedDepth; Depth rootDepth, completedDepth, depth;
Value rootDelta; Value rootDelta;
CounterMoveHistory counterMoves; CounterMoveHistory counterMoves;
ButterflyHistory mainHistory; ButterflyHistory mainHistory;