X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fevaluate.cpp;h=9061a38421fb75ae22be58f8f77940455a17c781;hb=f7d1491b3df28bf10faac81e340cb6a22fc5b57b;hp=718c7bc035da95f92718e73fe599ee376ff793d7;hpb=cc7bcd5303a645223a6cd853817d3172754243aa;p=stockfish

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 718c7bc0..9061a384 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -192,7 +192,6 @@ using namespace Trace;
 
 namespace {
 
-
   // Threshold for lazy and space evaluation
   constexpr Value LazyThreshold1    =  Value(3631);
   constexpr Value LazyThreshold2    =  Value(2084);
@@ -1084,13 +1083,14 @@ make_v:
 Value Eval::evaluate(const Position& pos) {
 
   Value v;
-  bool useClassical = false;
+  // Deciding between classical and NNUE eval (~10 Elo): for high PSQ imbalance we use classical,
+  // but we switch to NNUE during long shuffling or with high material on the board.
+  bool useClassical = (pos.this_thread()->depth > 9 || pos.count<ALL_PIECES>() > 7) &&
+          abs(eg_value(pos.psq_score())) * 5 > (856 + pos.non_pawn_material() / 64) * (10 + pos.rule50_count());
 
   // Deciding between classical and NNUE eval (~10 Elo): for high PSQ imbalance we use classical,
   // but we switch to NNUE during long shuffling or with high material on the board.
-  if (  !useNNUE
-      || ((pos.this_thread()->depth > 9 || pos.count<ALL_PIECES>() > 7) &&
-          abs(eg_value(pos.psq_score())) * 5 > (856 + pos.non_pawn_material() / 64) * (10 + pos.rule50_count())))
+  if (!useNNUE || useClassical)
   {
       v = Evaluation<NO_TRACE>(pos).value();          // classical
       useClassical = abs(v) >= 297;