diff --git a/index.html b/index.html
index cf74d20..e973b47 100644
--- a/index.html
+++ b/index.html
@@ -475,6 +475,17 @@
                 subgroupSelect.innerHTML = '<option value="">Tous</option>';
             }
 
+            function extractSubgroup(name) {
+                // Extract subgroup from name by removing opponent part after " - "
+                if (!name) return "";
+                const parts = name.split(" - ");
+                if (parts.length > 1) {
+                    parts.pop(); // Remove opponent
+                    return parts.join(" - ");
+                }
+                return name;
+            }
+
             function updateSubgroupOptions(selectedAgegroup, events) {
                 // Reset subgroup options
                 subgroupSelect.innerHTML = '<option value="">Tous</option>';
@@ -493,10 +504,9 @@
                 events
                     .filter(event => event.agegroup === selectedAgegroup)
                     .forEach(event => {
-                        // Extract subgroup from event.name or event.title
-                        // This assumes the subgroup is part of the name field
+                        // Extract subgroup from event.name by removing opponent
                         if (event.name && event.name !== selectedAgegroup) {
-                            subgroups.add(event.name);
+                            subgroups.add(extractSubgroup(event.name));
                         }
                     });
 
@@ -521,7 +531,8 @@
                     if (selectedAgegroup !== "" && event.agegroup !== selectedAgegroup) return false;
 
                     // Filter by subgroup
-                    if (selectedSubgroup !== "" && event.name !== selectedSubgroup) return false;
+                    let eventSubgroup = extractSubgroup(event.name);
+                    if (selectedSubgroup !== "" && eventSubgroup !== selectedSubgroup) return false;
 
                     return true;
                 });