is playable change

src/GomokuCell.java

@@ -1,6 +1,8 @@
 import java.util.EnumMap;
 import java.util.concurrent.ExecutionException;
 
+import javax.smartcardio.Card;
+
 /**
  * This class is cell of the board of the Gomoku game.
  */
@@ -83,7 +85,10 @@ public class GomokuCell{
      * @return True if the current cell can be played with the condition of the gomoku.
      */
     public boolean isPlayable(){
-        return this.neighbour.size() > 0;
+        for (Cardinal c : Cardinal.values()) {
+            if (this.getNeighbour(c).isPlayed()) return true;
+        }
+        return false;
     }