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Simplify away complexity in evaluation

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Simplification STC: https://tests.stockfishchess.org/tests/view/64394bc0605991a801b4f6f0
LLR: 2.95 (-2.94,2.94) <-1.75,0.25>
Total: 72360 W: 19313 L: 19138 D: 33909
Ptnml(0-2): 206, 7883, 19800, 8112, 179

Simplification LTC: https://tests.stockfishchess.org/tests/view/6439e788c233ce943b6bdac1
LLR: 2.94 (-2.94,2.94) <-1.75,0.25>
Total: 224992 W: 60665 L: 60654 D: 103673
Ptnml(0-2): 96, 21875, 68526, 21920, 79

closes https://github.com/official-stockfish/Stockfish/pull/4530

Bench: 3709369
This commit is contained in:
Muzhen Gaming
2023-04-14 20:48:22 +08:00
committed by Joost VandeVondele
parent f9d9c69bc3
commit c90dd38903
5 changed files with 10 additions and 31 deletions
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10
src/evaluate.cpp
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@@ -1046,7 +1046,7 @@ make_v:
/// evaluate() is the evaluator for the outer world. It returns a static
/// evaluation of the position from the point of view of the side to move.
Value Eval::evaluate(const Position& pos, int* complexity) {
Value Eval::evaluate(const Position& pos) {
assert(!pos.checkers());
@@ -1075,10 +1075,6 @@ Value Eval::evaluate(const Position& pos, int* complexity) {
+ (424 + optimism) * abs(psq - nnue)
) / 1024;
// Return hybrid NNUE complexity to caller
if (complexity)
*complexity = nnueComplexity;
optimism = optimism * (272 + nnueComplexity) / 256;
v = (nnue * scale + optimism * (scale - 748)) / 1024;
}
@@ -1089,10 +1085,6 @@ Value Eval::evaluate(const Position& pos, int* complexity) {
// 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);
// When not using NNUE, return classical complexity to caller
if (complexity && useClassical)
*complexity = abs(v - psq);
return v;
}