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simplified and increased threshold to switch between NNUE and classical

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STC https://tests.stockfishchess.org/tests/view/5f2deb1661e3b6af6488200f
LLR: 2.96 (-2.94,2.94) {-1.50,0.50}
Total: 10376 W: 1481 L: 1359 D: 7536
Ptnml(0-2): 91, 953, 2981, 1069, 94

LTC: https://tests.stockfishchess.org/html/live_elo.html?5f2e0a0461e3b6af64882019
LLR: 2.99 (-2.94,2.94) {-1.50,0.50}
Total: 5040 W: 375 L: 315 D: 4350
Ptnml(0-2): 7, 263, 1926, 311, 13

closes https://github.com/official-stockfish/Stockfish/pull/2934

Bench: 4067325
This commit is contained in:
U-DESKTOP-3900\Mark 2020-08-07 19:53:18 -04:00 • committed by Joost VandeVondele
parent 910f779eb1
commit 23ecf3d5c6
2 changed files with 4 additions and 5 deletions
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7
src/evaluate.cpp
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@ -110,7 +110,7 @@ namespace {
constexpr Value LazyThreshold1 = Value(1400);
constexpr Value LazyThreshold2 = Value(1300);
constexpr Value SpaceThreshold = Value(12222);
constexpr Value NNUEThreshold = Value(500);
constexpr Value NNUEThreshold = Value(520);
// KingAttackWeights[PieceType] contains king attack weights by piece type
constexpr int KingAttackWeights[PIECE_TYPE_NB] = { 0, 0, 81, 52, 44, 10 };
@ -939,10 +939,9 @@ Value Eval::evaluate(const Position& pos) {
if (Eval::useNNUE)
{
Value balance = pos.non_pawn_material(WHITE) - pos.non_pawn_material(BLACK);
balance += 200 * (pos.count<PAWN>(WHITE) - pos.count<PAWN>(BLACK));
Value v = eg_value(pos.psq_score());
// Take NNUE eval only on balanced positions
if (abs(balance) < NNUEThreshold)
if (abs(v) < NNUEThreshold)
return NNUE::evaluate(pos) + Tempo;
}
return Evaluation<NO_TRACE>(pos).value();