private void AddCardsToHistoryOfThisGame()
 {
     Player1PlayedSets.Add(GetIdentifier(Player1Cards));
     Player2PlayedSets.Add(GetIdentifier(Player2Cards));
 }
 private bool AreGameSetsUnique()
 {
     return(!Player1PlayedSets.Contains(GetIdentifier(Player1Cards)) &&
            !Player2PlayedSets.Contains(GetIdentifier(Player2Cards)));
 }