diff --git a/src/arenas/Battleship/functions.php b/src/arenas/Battleship/functions.php
index 63f1244..723c8b8 100644
--- a/src/arenas/Battleship/functions.php
+++ b/src/arenas/Battleship/functions.php
@@ -1,10 +1,26 @@
 <?php
 function is_it_possible_to_place_ships_on_grid($gridWidth,$gridHeight,$nbShipsSize1,$nbShipsSize2,$nbShipsSize3,$nbShipsSize4,$nbShipsSize5,$nbShipsSize6){
   //return false or true
-
-
+  //not a perfect solution
+  $shipsArea=$nbShipsSize1 + 2 * $nbShipsSize2 + 3 * $nbShipsSize3 + 4 * $nbShipsSize4 + 5 * $nbShipsSize5 + 6 * $nbShipsSize6;
+  if( $shipsArea < $gridHeight * $gridwidth / 2){
+    return false;
+  }
+  //longest ship
+  for($i=6; $i > 0; $i--){
+    $var='nbShipsSize'.$i;
+    if($$var > 0){
+        $longestShip=$$var;
+        break;
+    }
+  }
+  if( (!isset($longestShip))
+       OR(($longestShip > $gridWidth) && ($longestShip > $gridHeight))
+  ){
+    return false:
+  }
 }
-function get_Post_Params($botsCount){
+function get_Post_Params($ccbotsCount){
       $keysBots=array('bot1','bot2');
       foreach($keysBots as $botKey){
 	if(!isset($_POST[$botKey])){