diff --git a/stupidIATron.php b/stupidIATron.php
index 2982b95..28d2da2 100644
--- a/stupidIATron.php
+++ b/stupidIATron.php
@@ -14,17 +14,33 @@ switch($params['action']){
 		echo '{"name":"Stupid AI"}';
 		break;
 	case "play-turn":
-		//to do
-		//{"game-id":"","action":"play-turn","game":"tron","board":[[[619,240]],[[329,353]]],"player-index":0,"players":2}
+		
+		//Input JSON exemple:
+		/*{
+		"game-id":"1647",
+		"action":"play-turn",
+		"game":"tron",
+		"board":[
+		  [
+		    [425,763],[424,763],[423,763],[422,763],[421,763],[420,763],[419,763]
+		   ],
+		   [
+		    [858,501],[857,501],[856,501],[855,501],[854,501],[853,501],[852,501]
+		   ]
+		 ],
+		"player-index":0,
+		"players":2}
+		*/
 		
 		//put all non empty coords on array
 		$busyCells = array();
 		
-		foreach($params['board'] as $tails){
-		  foreach($tails as $coords){
-		    $busyCells[] = $coords;
+		foreach($params['board'] as $tail){
+		  foreach($tail as $coord){
+		    $busyCells[] = $coord[0].",".$coord[1];
 		  }
 		}
+		
 		//get my head coords
 		$myCoords = end($params['board'][$params['player-index']]);
 		
@@ -32,18 +48,18 @@ switch($params['action']){
 		$y = $myCoords[1];
 		
 		$availablesDirs = array();
-		if (in_array(($x + 1).",".$y, $busyCells)){
-		  $availablesDirs[] = "x+";
-		}
-		if (in_array(($x -1 ).",".$y, $busyCells)){
+		if (!in_array(($x + 1).",".$y, $busyCells)){
 		  $availablesDirs[] = "x-";
 		}
-		if (in_array($x.",".($y + 1), $busyCells)){
-		  $availablesDirs[] = "y+";
+		if (!in_array(($x -1 ).",".$y, $busyCells)){
+		  $availablesDirs[] = "x+";
 		}
-		if (in_array($x.",".($y - 1), $busyCells)){
+		if (!in_array($x.",".($y + 1), $busyCells)){
 		  $availablesDirs[] = "y-";
 		}
+		if (!in_array($x.",".($y - 1), $busyCells)){
+		  $availablesDirs[] = "y+";
+		}
 		
 		if(count($availablesDirs) == 0){
 		  echo '{"play":"x+","comment":"I Loose"}';
@@ -51,8 +67,8 @@ switch($params['action']){
 		  shuffle($availablesDirs);
 		  echo '{"play":"'.$availablesDirs[0].'"}';
 		}
-		
+		//error_log(json_encode($availablesDirs));
 		break;
 	default:
 		break;
-}
+}
\ No newline at end of file