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Simplify both position calls in useClassical

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Simplify the use of classical evaluation when using default settings to only be dependent on piece count and decisive PSQ

passed STC:
https://tests.stockfishchess.org/tests/view/632d32a7006ef9eb96d86ce9
LLR: 2.96 (-2.94,2.94) <-1.75,0.25>
Total: 108048 W: 28904 L: 28763 D: 50381
Ptnml(0-2): 383, 12060, 29006, 12183, 392

passed LTC:
https://tests.stockfishchess.org/tests/view/632d705a006ef9eb96d87649
LLR: 2.93 (-2.94,2.94) <-1.75,0.25>
Total: 76600 W: 20671 L: 20516 D: 35413
Ptnml(0-2): 34, 7533, 23023, 7664, 46

Inspired by sorais, credit to him.

closes https://github.com/official-stockfish/Stockfish/pull/4177

bench  4173163
This commit is contained in:
peregrineshahin 2022-09-22 08:49:21 +03:00 • committed by Joost VandeVondele
parent 4339a756ac
commit 232bf19be4
1 changed files with 4 additions and 6 deletions
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10
src/evaluate.cpp
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@ -1054,12 +1054,10 @@ Value Eval::evaluate(const Position& pos, int* complexity) {
Color stm = pos.side_to_move();
Value psq = pos.psq_eg_stm();
// Deciding between classical and NNUE eval: for high PSQ imbalance we use classical,
// but we switch to NNUE during long shuffling or with high material on the board.
bool useClassical = !useNNUE ||
((pos.count<ALL_PIECES>() > 7)
&& abs(psq) * 5 > (856 + pos.non_pawn_material() / 64) * (10 + pos.rule50_count()));
// We use the much less accurate but faster Classical eval when the NNUE
// option is set to false. Otherwise we use the NNUE eval unless the
// PSQ advantage is decisive and several pieces remain (~3 Elo)
bool useClassical = !useNNUE || (pos.count<ALL_PIECES>() > 7 && abs(psq) > 1760);
if (useClassical)
v = Evaluation<NO_TRACE>(pos).value();
else