diff --git a/CHANGELOG.md b/CHANGELOG.md
index 147d314..84935d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+1.0.0
+
+- fix: broken algo for extreme keys range detection
+
 0.9.0
 
 - fix problem with translation calculation when all keys are marked
diff --git a/OP_animate_path.py b/OP_animate_path.py
index 40f2318..6ae74f2 100644
--- a/OP_animate_path.py
+++ b/OP_animate_path.py
@@ -42,9 +42,12 @@ def has_extremes(b, act=None):
 
 def get_extreme_range(ob, act, b):
     b_fcurves = [fcu for fcu in act.fcurves if fcu.data_path.split('"')[1] == b.bone.name]
-    start_frame = end_frame = None
-
+    # for f in b_fcurves:
+    #     print('fc:', f.data_path, f.array_index)
+    curves = []
     for fcu in b_fcurves:
+        start_frame = end_frame = None
+        e_ct = 0
         encountered_marks = False # flag to stop after last extreme of each fcu
         for k in fcu.keyframe_points:
             # if k.select_control_point: # based on selection ?
@@ -61,15 +64,37 @@ def get_extreme_range(ob, act, b):
                     end_frame = f
                 if end_frame < f:
                     end_frame = f
-
-            else:
-                if encountered_marks:
-                    ## means back to other frame type after passed breakdown we stop
-                    ## (for this fcu)
+                
+                e_ct += 1
+                continue
+            
+            # it's a normal keyframe
+            if encountered_marks:
+                if e_ct == 1:
+                    # reset (continue scan to next frame range)
+                    e_ct = 0
+                    start_frame = end_frame = None
+                    encountered_marks = False
+                
+                else:
+                    ## means back to other frame type after passed sufficient key
+                    ## (stop for this fcu)
                     break
-    if start_frame is None or end_frame is None:
+
+        print(fcu.data_path, fcu.array_index, start_frame, end_frame)
+        if start_frame is None or end_frame is None:
+            continue
+        if end_frame - start_frame == 0: # same key
+            continue
+
+        print('ok')
+        curves.append(end_frame - start_frame)
+
+    if not curves:
         return
-    return end_frame - start_frame
+    print('curves: ', curves)
+    curves.sort()
+    return curves[-1]
 
 def find_best_foot(ob):
     '''Get an armature object and do some wizardry to return best match for foot bone'''
@@ -120,17 +145,20 @@ def find_best_foot(ob):
         return b
     
     flipped_contact_range = get_extreme_range(ob, act, flipped)
-    if not flipped_contact_range:
-        return b
+    print('flipped_contact_range: ', flipped_contact_range)
     
     bone_contact_range = get_extreme_range(ob, act, b)
-    if bone_contact_range:
-        if bone_contact_range < flipped_contact_range:
-            return flipped
-    else:
-        return ('ERROR', f'No Extreme (red keys) on bone "{b.name}" for action "{act.name}"')
+    print('bone_contact_range: ', bone_contact_range)
     
-    return b
+    if bone_contact_range:
+        if flipped_contact_range and (bone_contact_range < flipped_contact_range):
+            return flipped
+        else:
+            return b
+    elif flipped_contact_range:
+        return flipped
+
+    return ('ERROR', f'No Extreme (red keys) on bone "{b.name}" for action "{act.name}"')
 
 
 def anim_path_from_translate():
@@ -189,8 +217,10 @@ def anim_path_from_translate():
     b_fcurves = [fcu for fcu in act.fcurves if fcu.data_path.split('"')[1] == b.bone.name]
     print('b_fcurves: ', len(b_fcurves))
 
-    start_frame = end_frame = None
+    # find best fcurve
+
     for fcu in b_fcurves:
+        start_frame = end_frame = None
         # skip problematic keys
         if not len(fcu.keyframe_points):
             if debug: print(fcu.data_path, fcu.array_index, '>> no keys !')
@@ -202,8 +232,8 @@ def anim_path_from_translate():
             continue
 
         encountered_marks = False # flag to stop after last extreme of each fcu
+        e_ct = 0
         for k in fcu.keyframe_points:
-            # if k.select_control_point: # based on selection ?
             if k.type == 'EXTREME':
                 encountered_marks = True
                 
@@ -217,15 +247,33 @@ def anim_path_from_translate():
                     end_frame = f
                 if end_frame < f:
                     end_frame = f
-
-            else:
-                if encountered_marks:
+                
+                e_ct += 1
+                continue
+            
+            # this is a normal keyframe 
+            if encountered_marks:
+                if e_ct == 1:
+                    # mean only one extreme has been scanned
+                    # reset and continue de keys scan
+                    e_ct = 0
+                    start_frame = end_frame = None
+                    encountered_marks = False
+                else:
                     ## means back to other frame type after passed breakdown we stop
                     ## (for this fcu)
                     break
 
+        if start_frame is None or end_frame is None:
+            continue
+        if start_frame == end_frame:
+            continue
+
+        # we have a range and were probably happy with this one.
+        break
+
     if start_frame is None or end_frame is None:
-        return ('ERROR', f'No / All / not enough keyframe marked Extreme {ob.name} > {b.name}')
+        return ('ERROR', f'No / All or not enough keyframe marked Extreme {ob.name} > {b.name}')
     if start_frame == end_frame:
        return ('ERROR', f'Only one key detected as extreme (at frame {start_frame}) !\nNeed at least two chained marked keys')
 
diff --git a/__init__.py b/__init__.py
index cd2cb4b..bb44d1b 100644
--- a/__init__.py
+++ b/__init__.py
@@ -4,7 +4,7 @@ bl_info = {
     "name": "Unfold Anim Cycle",
     "description": "Anim tools to develop walk/run cycles along a curve",
     "author": "Samuel Bernou",
-    "version": (0, 9, 1),
+    "version": (1, 0, 0),
     "blender": (3, 0, 0),
     "location": "View3D",
     "warning": "",