
Actually, it's not a bug, it's a feature

It's origin is in ancient times, when I just started to work on this game. It was meant solely for testing purposes. During programming, I had to try if everything works ok very often, and it would be annying to have to always open 2 windows, connect as 2 players, create a game, join the game etc. Thus, I made "single-player" option. It is still useful for me, but I will remove it soon.
now, is this worth the 2 points it costs to leave the game? i dunno, that's up to you
there is simple workaround: just click non-rated game
