diff --git a/docs/endpoint-map.md b/docs/endpoint-map.md
index 78b611c..f390386 100644
--- a/docs/endpoint-map.md
+++ b/docs/endpoint-map.md
@@ -48,7 +48,7 @@ This document maps confirmed or suspected FIFA 23 FUT API endpoints to their Ope
 
 | FUT Endpoint | Core Endpoint | Status | Notes |
 |---|---|---|---|
-| Unknown | `POST /matches/result` | ❌ | Needs capture |
+| Unknown | `POST /matches/complete` | ❌ | Needs capture. Body must carry a `match_identity` (exactly-once key). `POST /matches/result` was removed — no transaction, no idempotency key. |
 
 ## Objectives
 
diff --git a/src/dashboard.html b/src/dashboard.html
index ec95a05..764d199 100644
--- a/src/dashboard.html
+++ b/src/dashboard.html
@@ -1651,12 +1651,20 @@ async function submitMatch() {
   const opponentName = currentOpponent?.opponent_name ?? `${diff.replace('_',' ')} Bot`;
 
   try {
-    const r = await api('POST', '/matches/result', {
+    // Each click is a distinct match, so it mints its own identity: the
+    // exactly-once route keys idempotency on it, and the old /matches/result
+    // path (no transaction, no identity) is closed. The dashboard drives Core's
+    // own match mode, so it opts into Core loan expiry and season progression.
+    const r = await api('POST', '/matches/complete', {
+      match_identity: `dashboard-${Date.now()}-${Math.random().toString(36).slice(2, 10)}`,
+      result: gf > ga ? 'win' : gf === ga ? 'draw' : 'loss',
       squad_id: 'dashboard',
       opponent_name: opponentName,
       goals_for: gf,
       goals_against: ga,
       mode: 'squad_battles',
+      expire_loans: true,
+      advance_season: true,
     });
     const outcome = gf > ga ? 'Win' : gf === ga ? 'Draw' : 'Loss';
     const outcomeColor = gf > ga ? '#3fb950' : gf === ga ? '#8b949e' : '#f85149';
diff --git a/src/mapper.rs b/src/mapper.rs
index d9cb0a1..7e25a21 100644
--- a/src/mapper.rs
+++ b/src/mapper.rs
@@ -157,8 +157,10 @@ const EXACT: &[ExactRoute] = &[
     },
     ExactRoute {
         ea_method: "POST", ea_path: "/ut/game/fut/result",
-        core_method: "POST", core_path: "/matches/result",
-        notes: "FUT match result submit → Core match result",
+        core_method: "POST", core_path: "/matches/complete",
+        notes: "FUT match result submit → Core exactly-once match completion. \
+                Core requires a match_identity on the body; /matches/result was \
+                removed because it had no transaction and no idempotency key.",
     },
     ExactRoute {
         ea_method: "GET", ea_path: "/ut/game/fut/matches",
@@ -301,8 +303,9 @@ const EXACT: &[ExactRoute] = &[
     },
     ExactRoute {
         ea_method: "POST", ea_path: "/ut/game/fut/rivals/result",
-        core_method: "POST", core_path: "/matches/result",
-        notes: "FUT rivals match result → Core match result",
+        core_method: "POST", core_path: "/matches/complete",
+        notes: "FUT rivals match result → Core exactly-once match completion \
+                (body must carry a match_identity).",
     },
     ExactRoute {
         ea_method: "GET", ea_path: "/ut/game/fut/rivals/leaderboard",
@@ -783,7 +786,7 @@ mod tests {
     fn test_rivals_result_maps() {
         let m = map_to_core("POST", "/ut/game/fut/rivals/result");
         assert!(m.is_some());
-        assert_eq!(m.unwrap().core_path, "/matches/result");
+        assert_eq!(m.unwrap().core_path, "/matches/complete");
     }
 
     #[test]