Value Eval::evaluate(const Position& pos) {
bool classical = !Eval::useNNUE
- || abs(eg_value(pos.psq_score())) >= NNUEThreshold;
+ || abs(eg_value(pos.psq_score())) >= NNUEThreshold * (16 + pos.rule50_count()) / 16;
Value v = classical ? Evaluation<NO_TRACE>(pos).value()
- : NNUE::evaluate(pos) + Tempo;
+ : NNUE::evaluate(pos) * 5 / 4 + Tempo;
// Damp down the evaluation linearly when shuffling
v = v * (100 - pos.rule50_count()) / 100;
+ // Guarantee evalution outside of TB range
+ v = Utility::clamp(v, VALUE_TB_LOSS_IN_MAX_PLY + 1, VALUE_TB_WIN_IN_MAX_PLY - 1);
+
return v;
}