diff --git a/wgamesolv.py b/wgamesolv.py
index 404434d..c23b866 100755
--- a/wgamesolv.py
+++ b/wgamesolv.py
@@ -57,10 +57,12 @@ def resolv_len(liste, lenght):
 
 def resolv_pattern(liste, pattern):
     # Pattern : élimination des mots ne satisfaisant pas la pattern
-    pattern_dict = {}
+    pattern_dict, not_pattern_dict = {}, {}
     for lettre in pattern:
-        if lettre != ".":
+        if lettre != "." and lettre.isupper():
             pattern_dict.update({pattern.index(lettre): lettre})
+        if lettre != "." and lettre.islower():
+            not_pattern_dict.update({pattern.index(lettre): lettre.upper()})
     MotsOK, MotsKO = [], []
     for mot in liste:
         for key in pattern_dict:
@@ -68,6 +70,10 @@ def resolv_pattern(liste, pattern):
                 MotsOK.append(mot)
             else:
                 MotsKO.append(mot)
+        for key in not_pattern_dict:
+            if mot[key] == not_pattern_dict[key]:
+                MotsKO.append(mot)
+    MotsKO = set(MotsKO)
     liste = [mot for mot in MotsOK if mot not in MotsKO]
     liste = list(set(liste))
     return liste