Neither can the non-escaper leave. You've just opened up the possibility for ridiculous abuse, albeit at substantial cost to the abuser.

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Occupy Babel!

Well, it happened that I was playing and the electricity went off. So, I am an escaper? I need a mark? Accidents happen.

If your opponent goes out of the game, just think that you won and play another game

An awful lot of the people who escape against me don't even bother to log off. They just start playing another game immediately with somebody else. Could the system give that higher weight when deciding if somebody is an escaper, since it's clear they aren't suffering 'connection problems'?

It doesn't bother me that much when somebody escapes at the end -- at least I got a game in. What I really hate is people who just escape for no apparent reason in the middle of the game.