It really saddens me I am forced to post this.
AntarestheKuuk is a skilled player, and a nice guy I was always on good terms with. Unfortunately, he decided to show the other side of his personality, then to boast about that ):
We had a conflict during the match, but nothing justifies an invalidation on purpose after an hour-long game. I believe such players should be banned (temporarily, at least). I've proposed to concede a dozen times, instead, he played this game to the very end and invalidated when our cit was at 1.5k hp.
A replay is available, if needed.
Screenshot of Antares boasting in the lobby after the match about finally mastering the art of invalidation:
http://imageshack.us/f/28/antarest.jpg/