diff --git a/javaAPI/arena_results.csv b/javaAPI/arena_results.csv
index e69de29..6b82172 100644
--- a/javaAPI/arena_results.csv
+++ b/javaAPI/arena_results.csv
@@ -0,0 +1,7 @@
+Bot 1, Bot 2, Winner
+RandomBot,MiniMaxBot,WIN
+RandomBot,HeuristicBot,WIN
+RandomBot,MonteCarloBot,WIN
+MiniMaxBot,HeuristicBot,WIN
+MiniMaxBot,MonteCarloBot,WIN
+HeuristicBot,MonteCarloBot,WIN
diff --git a/javaAPI/fr/iut_fbleau/HexGame/Arena.java b/javaAPI/fr/iut_fbleau/HexGame/Arena.java
index b236f22..379fc11 100644
--- a/javaAPI/fr/iut_fbleau/HexGame/Arena.java
+++ b/javaAPI/fr/iut_fbleau/HexGame/Arena.java
@@ -12,11 +12,13 @@ public class Arena {
 
     private List<AbstractGamePlayer> bots = new ArrayList<>();
     private FileWriter csvWriter;
+    private int board_size;
 
-    public Arena() {
+    public Arena(int size) {
         try {
             csvWriter = new FileWriter("arena_results.csv");
             csvWriter.append("Bot 1, Bot 2, Winner\n");
+            this.board_size = size;
         } catch (IOException e) {
             e.printStackTrace();
         }
@@ -51,7 +53,7 @@ public class Arena {
     }
 
     private Result playMatch(AbstractGamePlayer bot1, AbstractGamePlayer bot2) {
-        IBoard board = new HexBoard(11);
+        IBoard board = new HexBoard(this.board_size);
         EnumMap<Player, AbstractGamePlayer> players = new EnumMap<>(Player.class);
         players.put(Player.PLAYER1, bot1);
         players.put(Player.PLAYER2, bot2);
diff --git a/javaAPI/fr/iut_fbleau/HexGame/ArenaMain.java b/javaAPI/fr/iut_fbleau/HexGame/ArenaMain.java
index 5dac4fe..013ac80 100644
--- a/javaAPI/fr/iut_fbleau/HexGame/ArenaMain.java
+++ b/javaAPI/fr/iut_fbleau/HexGame/ArenaMain.java
@@ -4,7 +4,11 @@ import fr.iut_fbleau.GameAPI.Player;
 
 public class ArenaMain {
     public static void main(String[] args) {
-        Arena arena = new Arena();
+        int size = 7;
+        if (args.length >= 1) {
+            try { size = Integer.parseInt(args[0]); } catch (NumberFormatException ignored) {}
+        }
+        Arena arena = new Arena(size);
         arena.addBot(new RandomBot(Player.PLAYER1, 12345L));  // Correct constructor usage
         arena.addBot(new MiniMaxBot(Player.PLAYER2));
         arena.addBot(new HeuristicBot(Player.PLAYER1));