diff --git a/reasoning_gym/cognition/rubiks_cube.py b/reasoning_gym/cognition/rubiks_cube.py
index 17f45315..072bd0de 100644
--- a/reasoning_gym/cognition/rubiks_cube.py
+++ b/reasoning_gym/cognition/rubiks_cube.py
@@ -137,20 +137,21 @@ class RubiksCubeDataset(ProceduralDataset):
         return ansi_escape.sub("", line)
 
     def expand_moves(self, move_str):
-        moves = move_str.split()
-        expanded = []
-        for move in moves:
-            # Split the move into the base part and any trailing digits
-            match = re.fullmatch(r"^([^\d]*)(\d*)$", move)
-            if match:
-                base, num_part = match.groups()
-                if num_part:
-                    # Append two copies of the base if there was a number. I don't think F3 is a valid signmaster notation etc
-                    expanded.append(base)
-                    expanded.append(base)
-                else:
-                    expanded.append(base)
-        return " ".join(expanded).strip()
+        try:
+            moves = move_str.split()
+            expanded = []
+            for move in moves:
+                # Split the move into the base part and any trailing digits
+                match = re.fullmatch(r"^([^\d]*)(\d*)$", move)
+                if match:
+                    base, num_part = match.groups()
+                    if num_part:
+                        expanded.extend([base] * int(num_part))
+                    else:
+                        expanded.append(base)
+            return " ".join(expanded).strip()
+        except Exception as e:
+            return move_str
 
 
 # Register the dataset
diff --git a/tests/test_rubiks_cube.py b/tests/test_rubiks_cube.py
index 781d2e69..f615d700 100644
--- a/tests/test_rubiks_cube.py
+++ b/tests/test_rubiks_cube.py
@@ -55,5 +55,7 @@ def test_rubikscube_items():
         if item["metadata"]["example_correct_answer"] != "R":
             assert dataset.score_answer(answer="R", entry=item) == 0.05
 
+        assert dataset.score_answer(answer="R2 R3 R4 R5 R'2 R'3", entry=item) == 0.05
+
         if len(item["metadata"]["example_correct_answer"]) > 0:
             assert dataset.score_answer(answer="", entry=item) == 0.01