position: Remove incomplete flip()

src/position.cpp

@@ -507,42 +507,6 @@ out:
     return k;
 }
 
-/// Position::flip() flips position with the white and black sides reversed. This
-/// is only useful for debugging e.g. for finding evaluation symmetry bugs.
-
-void Position::flip()
-{
-#if 0
-    string f, token;
-    std::stringstream ss(fen());
-
-    for (Rank r = RANK_8; r >= RANK_1; --r) // Piece placement
-    {
-        std::getline(ss, token, r > RANK_1 ? '/' : ' ');
-        f.insert(0, token + (f.empty() ? " " : "/"));
-    }
-
-    ss >> token; // Active color
-    f += (token == "w" ? "B " : "W "); // Will be lowercased later
-
-    ss >> token; // Castling availability
-    f += token + " ";
-
-    std::transform(f.begin(), f.end(), f.begin(),
-                   [](char c) { return char(islower(c) ? toupper(c) : tolower(c)); });
-
-    ss >> token; // En passant square
-    f += (token == "-" ? token : token.replace(1, 1, token[1] == '3' ? "6" : "3"));
-
-    std::getline(ss, token); // Half and full moves
-    f += token;
-
-    set(f, st, this_thread());
-
-    assert(pos_is_ok());
-#endif
-}
-
 
 ///////////////////////////////////////////////////////////////////////////////
 

src/position.h

@@ -92,7 +92,6 @@ public:
     Thread *this_thread() const;
     int rule50_count() const;
 
-    void flip();
 
     /// Mill Game
 

src/uci.cpp

@@ -216,7 +216,6 @@ void UCI::loop(int argc, char *argv[])
 
         // Additional custom non-UCI commands, mainly for debugging.
         // Do not use these commands during a search!
-        else if (token == "flip")     pos->flip();
         else if (token == "d")        sync_cout << *pos << sync_endl;
         else if (token == "compiler") sync_cout << compiler_info() << sync_endl;
         else