diff --git a/module/rdd-alchimie.js b/module/rdd-alchimie.js
index 6ceff48f..4fac68ac 100644
--- a/module/rdd-alchimie.js
+++ b/module/rdd-alchimie.js
@@ -44,20 +44,13 @@ export class RdDAlchimie {
   }
 
   /* -------------------------------------------- */
-  static getDifficulte( aspects ) {
-    let aspectsArray = aspects.split('-');
-    let diff = 0;
-    let nbDifferent = 0;
-    let aspectsHash = {}
-    for (let colconst of aspectsArray) {
-      if ( aspectsHash[colconst] ){  // Deja present, augmente difficulté de 1
-        diff -= 1;
-      } else {
-        nbDifferent++;
-        aspectsHash[colconst] = colconst; // Keep track
-      }
+  static getDifficulte(aspects) {
+    let elements = aspects.split('-');
+    let composantes = elements.length;
+    let distincts = Object.keys(Misc.classifyFirst(elements, it => it)).length;
+    if (distincts == 1) {
+      composantes--;
     }
-    diff = diff - ((nbDifferent>1) ? nbDifferent : 0); // Ca doit marcher ....
-    return Math.min(0, diff); // Pour être sur
+    return Math.min(0, -composantes);
   }
 }