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Refine Evaluation Scaling with Piece-Specific Weights

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Refine Evaluation Scaling with Piece-Specific Weights, instead of the simplified npm method.
I took the initial idea from Viren6 , as he worked on it in September of last year.
I worked on it, and tuned it, and now it passed both tests.

Passed STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 95712 W: 24731 L: 24325 D: 46656
Ptnml(0-2): 363, 11152, 24357, 11684, 300
https://tests.stockfishchess.org/tests/view/664b5493830eb9f886614af3

Passed LTC:
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 204480 W: 52167 L: 51501 D: 100812
Ptnml(0-2): 114, 22579, 56166, 23289, 92
https://tests.stockfishchess.org/tests/view/664b75dd830eb9f886614b44

closes https://github.com/official-stockfish/Stockfish/pull/5277

Bench: 1384337
This commit is contained in:
FauziAkram 2024-05-21 02:19:54 +03:00 • committed by Joost VandeVondele
parent f27a9be29c
commit 87bad0c38a
1 changed files with 7 additions and 2 deletions
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9
src/evaluate.cpp
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@ -76,8 +76,13 @@ Value Eval::evaluate(const Eval::NNUE::Networks& networks,
optimism += optimism * (nnueComplexity + std::abs(simpleEval - nnue)) / 584;
nnue -= nnue * (nnueComplexity * 5 / 3) / 32395;
int npm = pos.non_pawn_material() / 64;
v = (nnue * (npm + 943 + 11 * pos.count<PAWN>()) + optimism * (npm + 140)) / 1058;
v = (nnue
* (32961 + 381 * pos.count<PAWN>() + 349 * pos.count<KNIGHT>()
+ 392 * pos.count<BISHOP>() + 649 * pos.count<ROOK>() + 1211 * pos.count<QUEEN>())
+ optimism
* (4835 + 136 * pos.count<PAWN>() + 375 * pos.count<KNIGHT>()
+ 403 * pos.count<BISHOP>() + 628 * pos.count<ROOK>() + 1124 * pos.count<QUEEN>()))
/ 32768;
// Damp down the evaluation linearly when shuffling
v = v * (204 - pos.rule50_count()) / 208;