Merge official-stockfish/master

diff --cc README.md
Simple merge

diff --cc src/evaluate.cpp
index 9b30887,c396e0f..af810e0
--- 1/src/evaluate.cpp
--- 2/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@@ -47,11 -47,8 +47,9 @@@
  // Note that this does not work in Microsoft Visual Studio.
  #if !defined(_MSC_VER) && !defined(NNUE_EMBEDDING_OFF)
    INCBIN(EmbeddedNNUE, EvalFileDefaultName);
-   constexpr bool             gHasEmbeddedNet = true;
  #else
-   constexpr bool             gHasEmbeddedNet = false;
    const unsigned char        gEmbeddedNNUEData[1] = {0x0};
 +  [[maybe_unused]]
    const unsigned char *const gEmbeddedNNUEEnd = &gEmbeddedNNUEData[1];
    const unsigned int         gEmbeddedNNUESize = 1;
  #endif

diff --cc src/evaluate.h
Simple merge

diff --cc src/nnue/nnue_feature_transformer.h
Simple merge

diff --cc src/uci.cpp
index a78caa9,bb17b8d..310396b
--- 1/src/uci.cpp
--- 2/src/uci.cpp
+++ b/src/uci.cpp
@@@ -348,22 -277,14 +348,29 @@@ void UCI::loop(int argc, char* argv[]) 
        else if (token == "d")        sync_cout << pos << sync_endl;
        else if (token == "eval")     trace_eval(pos);
        else if (token == "compiler") sync_cout << compiler_info() << sync_endl;
-       else if (token == "export_net") Eval::NNUE::export_net();
+       else if (token == "export_net") {
+           std::optional<std::string> filename;
+           std::string f;
+           if (is >> skipws >> f) {
+             filename = f;
+           }
+           Eval::NNUE::export_net(filename);
+       }
 +      else if (token == "load")     { load(is); argc = 1; } // continue reading stdin
 +      else if (token == "check")    check(is);
 +      // UCI-Cyclone omits the "position" keyword
 +      else if (token == "fen" || token == "startpos")
 +      {
 +#ifdef LARGEBOARDS
 +          if (Options["Protocol"] == "uci" && Options["UCI_Variant"] == "chess")
 +          {
 +              Options["Protocol"].set_default("ucicyclone");
 +              Options["UCI_Variant"].set_default("xiangqi");
 +          }
 +#endif
 +          is.seekg(0);
 +          position(pos, is, states);
 +      }
        else if (!token.empty() && token[0] != '#')
            sync_cout << "Unknown command: " << cmd << sync_endl;