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Parameter Tweaks

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This patch is a parameter tweak that passed both STC and LTC tests.

STC:
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 80944 W: 21557 L: 21189 D: 38198
Ptnml(0-2): 192, 8883, 22028, 9103, 266
https://tests.stockfishchess.org/tests/view/63b07fe2d421d8f75795a03b

LTC:
LLR: 2.95 (-2.94,2.94) <0.50,2.50>
Total: 30440 W: 8296 L: 8007 D: 14137
Ptnml(0-2): 6, 2893, 9143, 3162, 16
https://tests.stockfishchess.org/tests/view/63b167d02ab1290f961644db

closes https://github.com/official-stockfish/Stockfish/pull/4318

Bench: 4182223
This commit is contained in:
FauziAkram
2023-01-02 19:14:05 +01:00
committed by Joost VandeVondele
parent a6fa683418
commit fc5b59b88b
2 changed files with 36 additions and 36 deletions
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src/evaluate.cpp
+6 -6
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@@ -1056,7 +1056,7 @@ Value Eval::evaluate(const Position& pos, int* complexity) {
// 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);
bool useClassical = !useNNUE || (pos.count<ALL_PIECES>() > 7 && abs(psq) > 1781);
if (useClassical)
v = Evaluation<NO_TRACE>(pos).value();
@@ -1071,8 +1071,8 @@ Value Eval::evaluate(const Position& pos, int* complexity) {
Value nnue = NNUE::evaluate(pos, true, &nnueComplexity);
// Blend nnue complexity with (semi)classical complexity
nnueComplexity = ( 412 * nnueComplexity
+ 428 * abs(psq - nnue)
nnueComplexity = ( 406 * nnueComplexity
+ 424 * abs(psq - nnue)
+ (optimism > 0 ? int(optimism) * int(psq - nnue) : 0)
) / 1024;
@@ -1080,12 +1080,12 @@ Value Eval::evaluate(const Position& pos, int* complexity) {
if (complexity)
*complexity = nnueComplexity;
optimism = optimism * (278 + nnueComplexity) / 256;
v = (nnue * scale + optimism * (scale - 755)) / 1024;
optimism = optimism * (272 + nnueComplexity) / 256;
v = (nnue * scale + optimism * (scale - 748)) / 1024;
}
// Damp down the evaluation linearly when shuffling
v = v * (197 - pos.rule50_count()) / 214;
v = v * (200 - pos.rule50_count()) / 214;
// Guarantee evaluation does not hit the tablebase range
v = std::clamp(v, VALUE_TB_LOSS_IN_MAX_PLY + 1, VALUE_TB_WIN_IN_MAX_PLY - 1);