diff --git a/RuleEngine/Phase/PhaseMachine.cs b/RuleEngine/Phase/PhaseMachine.cs
index 82f8636..879ba26 100644
--- a/RuleEngine/Phase/PhaseMachine.cs
+++ b/RuleEngine/Phase/PhaseMachine.cs
@@ -174,18 +174,20 @@ public class MahjongPhaseMachine
         return actions;
     }
 
+    /// <summary>Shared fan value fallback — single source of truth for both PhaseMachine and ScoreEngine.</summary>
+    public static int DefaultFanValue(string fanName) => fanName switch
+    {
+        "清一色" => 24, "混一色" => 6, "对对胡" => 2, "碰碰和" => 6,
+        "暗七对" => 8, "七对" => 8, "带幺九" => 2, "十三幺" => 88,
+        "鸡胡" => 1,
+        _ => 0
+    };
+
     private int GetFanValue(string fanName)
     {
         if (_fanConfig.TryGetValue(fanName, out var def))
             return def.BaseFan;
-        // Fallback for well-known fans when DSL doesn't define them
-        return fanName switch
-        {
-            "清一色" => 24, "混一色" => 6, "对对胡" => 2, "碰碰和" => 6,
-            "暗七对" => 8, "七对" => 8, "带幺九" => 2, "十三幺" => 88,
-            "鸡胡" => 1,
-            _ => 0
-        };
+        return DefaultFanValue(fanName);
     }
 
     private bool CanPung(MahjongGameState state, string playerId, int tile)
diff --git a/RuleEngine/Scoring/ScoreEngine.cs b/RuleEngine/Scoring/ScoreEngine.cs
index 5fc6240..be30df6 100644
--- a/RuleEngine/Scoring/ScoreEngine.cs
+++ b/RuleEngine/Scoring/ScoreEngine.cs
@@ -162,20 +162,7 @@ public class MahjongScoreEngine
     {
         if (_fanConfig.TryGetValue(fan, out var def))
             return def.BaseFan;
-        // Hardcoded values for well-known fans not in every DSL
-        return fan switch
-        {
-            "清一色" => 24,
-            "混一色" => 6,
-            "对对胡" => 2,
-            "碰碰和" => 6,
-            "暗七对" => 8,
-            "七对" => 8,
-            "带幺九" => 2,
-            "十三幺" => 88,
-            "鸡胡" => 1,
-            _ => 0
-        };
+        return Phase.MahjongPhaseMachine.DefaultFanValue(fan);
     }
 
     private static string FlowerName(int tile) => tile switch