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Also dampen NNUE eval with 50 move rule

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Move the existing dampening function last so that NNUE evaluations are
also handled as we approach the 50 move rule.

STC:
LLR: 2.95 (-2.94,2.94) {-0.50,1.50}
Total: 4792 W: 695 L: 561 D: 3536
Ptnml(0-2): 19, 420, 1422, 478, 57
https://tests.stockfishchess.org/tests/view/5f3164179081672066537534

LTC:
LLR: 8.62 (-2.94,2.94) {0.25,1.75}
Total: 286744 W: 18494 L: 17430 D: 250820
Ptnml(0-2): 418, 14886, 111745, 15860, 463
https://tests.stockfishchess.org/tests/view/5f316b039081672066537541

closes https://github.com/official-stockfish/Stockfish/pull/3004

Bench: 4001800
This commit is contained in:
Miguel Lahoz
2020-08-10 22:57:11 +08:00
committed by Joost VandeVondele
parent ce009ea1aa
commit e5f450cf0b
1 changed files with 9 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
src/evaluate.cpp
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@@ -927,9 +927,6 @@ make_v:
// Side to move point of view // Side to move point of view
v = (pos.side_to_move() == WHITE ? v : -v) + Tempo; v = (pos.side_to_move() == WHITE ? v : -v) + Tempo;
// Damp down the evaluation linearly when shuffling
v = v * (100 - pos.rule50_count()) / 100;
return v; return v;
} }
@@ -941,14 +938,15 @@ make_v:
Value Eval::evaluate(const Position& pos) { Value Eval::evaluate(const Position& pos) {
if (Eval::useNNUE) bool classical = !Eval::useNNUE
{ || abs(eg_value(pos.psq_score())) >= NNUEThreshold;
Value v = eg_value(pos.psq_score()); Value v = classical ? Evaluation<NO_TRACE>(pos).value()
// Take NNUE eval only on balanced positions : NNUE::evaluate(pos) + Tempo;
if (abs(v) < NNUEThreshold)
return NNUE::evaluate(pos) + Tempo; // Damp down the evaluation linearly when shuffling
} v = v * (100 - pos.rule50_count()) / 100;
return Evaluation<NO_TRACE>(pos).value();
return v;
} }
/// trace() is like evaluate(), but instead of returning a value, it returns /// trace() is like evaluate(), but instead of returning a value, it returns