This comparison code seems correct, but resulting matches object remains unsorted.

gistfile1.cs

		GameCenterTurnBasedManager.loadMatchesDidFinishEvent += (List<GKTurnBasedMatch> matches) => {
			Logger.Log ("loadMatchesDidFinish: " + Json.GetJsonString(matches));
			matches.Sort((x, y) => {
					 if (x.currentParticipant != null && x.currentParticipant.playerId == GameCenterBinding.playerIdentifier()) return -1;
				else if (y.currentParticipant != null && y.currentParticipant.playerId == GameCenterBinding.playerIdentifier()) return 1;
				else if (x.status == y.status) return  -x.creationDate.CompareTo(y.creationDate);
				else if (x.status == GKTurnBasedMatchStatus.Ended) return 1;
				else if (y.status == GKTurnBasedMatchStatus.Ended) return -1;
				else if (x.status == GKTurnBasedMatchStatus.Matching) return -1;
				else if (y.status == GKTurnBasedMatchStatus.Matching) return 1;
				else return 0;
			});
			MatchesLoadedEvent.Raise(this, new MatchesLoadedEventArgs() {Matches = matches});
		};