public void PlayedTogether(PlayerPairing playerPairing)
 {
     if (!_roundsPlayedTogether.ContainsKey(playerPairing))
     {
         _roundsPlayedTogether[playerPairing] = 0;
     }
     _roundsPlayedTogether[playerPairing] += 1;
 }
 public void UndoPlayerPairing(PlayerPairing playerPairing)
 {
     _roundsPlayedTogether[playerPairing] -= 1;
 }