diff --git a/incTron/Coords.php b/incTron/Coords.php
index 2521bcc..3272a0d 100644
--- a/incTron/Coords.php
+++ b/incTron/Coords.php
@@ -7,6 +7,7 @@ class Coords{
   public $y;
 
   public function __construct(int $x = 0, int $y = 0) {
+
     if (($x < Coords::$min) || ($x > Coords::$max) || ($y < Coords::$min) || ($y > Coords::$max)){
       //out of limits
       error_log("a bot out of limits");
@@ -22,6 +23,15 @@ class Coords{
   }
   
   public function addDirection(Direction $dir){
+    if (
+	    ($this->x + $dir->deltaX > Coords::$max)
+	 || ($this->x + $dir->deltaX < Coords::$min)
+	 || ($this->y + $dir->deltaY > Coords::$max)
+	 || ($this->y + $dir->deltaY < Coords::$min)
+    ){
+      return false;
+    }
+  
     return new Coords(
       $this->x + $dir->deltaX,
       $this->y + $dir->deltaY
diff --git a/stupidIATronBetter.php b/stupidIATronBetter.php
new file mode 100644
index 0000000..fae78b3
--- /dev/null
+++ b/stupidIATronBetter.php
@@ -0,0 +1,121 @@
+<?php
+
+/*
+* stupid IA for tron
+* but less stupid in order to test the arena code
+*
+* Copy left Gnieark https://blog-du-grouik.tinad.fr 2016
+* GNU GPL V3 license
+*/
+
+header('Access-Control-Allow-Origin: *');
+header('Access-Control-Allow-Methods: GET, POST'); 
+header('Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept');
+
+
+//load classes
+include ("incTron/Coords.php");
+include ("incTron/Direction.php");
+
+
+$in=file_get_contents('php://input');
+
+$params=json_decode($in, TRUE);
+function in_array_objet($searched,$array){
+  /*
+  *Because( in_array php function doesn't works if array contains objects)
+  */
+  
+  foreach($array as $obj){
+    if ($searched == $obj) return true;
+  }
+  return false;
+}
+
+function get_available_dirs($busyCells,$myCoords){
+
+  $directions =  array(
+    Direction::make("x+"),
+    Direction::make("x-"),
+    Direction::make("y+"),
+    Direction::make("y-")
+  );
+
+  $availablesDirs = array();
+  foreach ($directions as $dirObj){
+    if(!in_array_objet($myCoords->addDirection($dirObj),$busyCells, TRUE)){
+      $availablesDirs[] = $dirObj;
+    }
+  }
+  
+  return $availablesDirs;
+}
+
+function scoreDirection($busyCells,$headPOS,$dir){
+  $newBusyCells = $busyCells;
+  $newBusyCells[] = $headPOS->addDirection($dir);
+  return count(get_available_dirs($newBusyCells,$headPOS->addDirection($dir)));
+}
+
+
+switch($params['action']){
+	case "init":
+		echo '{"name":"Stupid AI"}';
+		break;
+	case "play-turn":
+		
+		//Input JSON exemple:
+		/*
+		{"game-id":"1784",
+		"action":"play-turn",
+		"game":"tron",
+		"board":[
+			  [[490,937],[489,937],[489,938]],
+			  [[349,806],[350,806],[350,805]]
+		      ],"player-index":0,"players":2}
+		*/
+		
+		//put all non empty coords on array
+		$busyCells = array();
+		error_log ("plop");
+		foreach($params['board'] as $tail){
+		  foreach($tail as $coord){
+		    $busyCells[] = new Coords($coord[0],$coord[1]);
+		  }
+		}
+
+		//get my head coords
+		$myCoords =  new Coords($params['board'][$params['player-index']][0][0],$params['board'][$params['player-index']][0][1]);
+		
+		
+		
+		$directions = array("x+","x-","y+","y-");
+		$maxLenght = -1;
+		foreach($directions as $direction){
+		  $dir = Direction::make($direction);
+		  //compter le nombre de cases libres dans cette direction
+		  //boucle sans fin!
+		  $count = 0;
+		  $tempCoords = $myCoords->addDirection($dir);
+		  while(
+			  (!in_array_objet($tempCoords,$busyCells))
+			  && ($tempCoords !== false)
+			  //&& ($tempCoords !== 0) //php sucks
+		  ){
+		    //error_log($tempCoords->x."|".$tempCoords->y."|".$count);
+		    $tempCoords = $tempCoords->addDirection($dir);
+		    $count++;
+		  }
+		  
+		  if( $count > $maxLenght ){
+		    $bestChoice = $direction;
+		    $maxLenght = $count;
+		  }  
+		}
+		echo '{"play":"'.$bestChoice .'"}';
+		error_log($bestChoice);
+		
+		break;
+	default:
+		break;
+}
\ No newline at end of file