+struct ExtMove {
+ Move move;
+ int value;
+
+ operator Move() const { return move; }
+ void operator=(Move m) { move = m; }
+
+ // Inhibit unwanted implicit conversions to Move
+ // with an ambiguity that yields to a compile error.
+ operator float() const = delete;
+};
+
+inline bool operator<(const ExtMove& f, const ExtMove& s) {
+ return f.value < s.value;
+}