diff --git a/Move.cpp b/Move.cpp
index 74b05c8..c1bb590 100644
--- a/Move.cpp
+++ b/Move.cpp
@@ -47,9 +47,13 @@ std::ostream &operator<<(std::ostream &os, const Move &move) {
 }
 
 bool operator<(const Move &lhs, const Move &rhs) {
-    (void) lhs;
-    (void) rhs;
-    return false;
+    if (!(lhs.from() == rhs.from()))
+        return lhs.from() < rhs.from();
+
+    if (!(lhs.to() == rhs.to()))
+        return lhs.to() < rhs.to();
+
+    return lhs.promotion() < rhs.promotion();
 }
 
 bool operator==(const Move &lhs, const Move &rhs) {