static void Main(string[] args)
{
AllyControlCenter acc;
acc = new ConcreteAllyControlCenter("0");
IObserver player1, player2, player3, player4;
player1 = new Player("a");
acc.Join(player1);
player2 = new Player("b");
acc.Join(player2);
player3 = new Player("c");
acc.Join(player3);
player4 = new Player("d");
acc.Join(player4);
player1.BeAttacked(acc);
Console.ReadKey(true);
}
