diff --git a/manifests/dev/base/abis/contracts/bytebeasts-battle_system-461868ac.json b/manifests/dev/base/abis/contracts/bytebeasts-battle_system-461868ac.json
index 5f6fb4e..2b4a2e8 100644
--- a/manifests/dev/base/abis/contracts/bytebeasts-battle_system-461868ac.json
+++ b/manifests/dev/base/abis/contracts/bytebeasts-battle_system-461868ac.json
@@ -131,6 +131,72 @@
     "name": "BattleActionsImpl",
     "interface_name": "bytebeasts::systems::battle::IBattleActions"
   },
+  {
+    "type": "struct",
+    "name": "bytebeasts::models::Beast",
+    "members": [
+      {
+        "name": "beast_id",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "beast_name",
+        "type": "core::felt252"
+      },
+      {
+        "name": "beast_type",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "beast_description",
+        "type": "core::felt252"
+      },
+      {
+        "name": "player_id",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "hp",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "current_hp",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "attack",
+        "type": "core::integer::u64"
+      },
+      {
+        "name": "defense",
+        "type": "core::integer::u64"
+      },
+      {
+        "name": "mt1",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "mt2",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "mt3",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "mt4",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "level",
+        "type": "core::integer::u32"
+      },
+      {
+        "name": "experience_to_next_level",
+        "type": "core::integer::u64"
+      }
+    ]
+  },
   {
     "type": "interface",
     "name": "bytebeasts::systems::battle::IBattleActions",
@@ -150,6 +216,26 @@
         ],
         "outputs": [],
         "state_mutability": "external"
+      },
+      {
+        "type": "function",
+        "name": "check_flee_success",
+        "inputs": [
+          {
+            "name": "player_beast",
+            "type": "bytebeasts::models::Beast"
+          },
+          {
+            "name": "opponent_beast",
+            "type": "bytebeasts::models::Beast"
+          }
+        ],
+        "outputs": [
+          {
+            "type": "core::felt252"
+          }
+        ],
+        "state_mutability": "view"
       }
     ]
   },
diff --git a/manifests/dev/base/contracts/bytebeasts-battle_system-461868ac.toml b/manifests/dev/base/contracts/bytebeasts-battle_system-461868ac.toml
index 2570f2d..42903d7 100644
--- a/manifests/dev/base/contracts/bytebeasts-battle_system-461868ac.toml
+++ b/manifests/dev/base/contracts/bytebeasts-battle_system-461868ac.toml
@@ -1,6 +1,6 @@
 kind = "DojoContract"
-class_hash = "0x26ce110d44d925e05ce62603ad698824266db3199eb9a549e996cd94b94dd73"
-original_class_hash = "0x26ce110d44d925e05ce62603ad698824266db3199eb9a549e996cd94b94dd73"
+class_hash = "0x43222893b3ed91744967f9971ca278b217e57668303c343fc9b9abbaead14c1"
+original_class_hash = "0x43222893b3ed91744967f9971ca278b217e57668303c343fc9b9abbaead14c1"
 base_class_hash = "0x0"
 abi = "manifests/dev/base/abis/contracts/bytebeasts-battle_system-461868ac.json"
 reads = []
diff --git a/src/systems/battle.cairo b/src/systems/battle.cairo
index b572025..4f22b42 100644
--- a/src/systems/battle.cairo
+++ b/src/systems/battle.cairo
@@ -9,6 +9,7 @@ use bytebeasts::models::Battle;
 #[dojo::interface]
 trait IBattleActions {
     fn init_battle(ref world: IWorldDispatcher, player_id: u32, opponent_id: u32);
+    fn check_flee_success(player_beast: Beast, opponent_beast: Beast) -> felt252;
 }
 
 #[dojo::contract]
@@ -37,6 +38,15 @@ mod battle_system {
                     turn: 0,
                 })
             );
+            // Try to send a message to the player (emit)
         }
+
+        fn check_flee_success(player_beast: Beast, opponent_beast: Beast) -> felt252 {
+          if player_beast.level > opponent_beast.level {
+              1 // Success
+          } else {
+              0 // Fail
+          }
+      }
     }
 }