-extern Value evaluate(const Position& pos, Value& margin);
-extern std::string trace_evaluate(const Position& pos);
-extern void read_evaluation_uci_options(Color sideToMove);
+namespace Eval {
+
+const Value Tempo = Value(17); // Must be visible to search
+
+void init();
+Value evaluate(const Position& pos);
+std::string trace(const Position& pos);
+
+}