Is there a chess program that can detect if someone has left the game? I was playing a game with someone and they left because they knew they were going to lose. This is a really annoying thing that has happened to me. I would like to know if there is a chess program that knows if someone has switched to another screen.
Lichess (http://lichess.org) has some ability to detect when your opponent has left the game. When that happens, it gives your opponent a brief chance to rejoin, then allows you to claim a victory or a draw if they do not rejoin. If Lichess detects that your opponent has left, it will show a counter counting down the seconds until you can claim victory. The amount of time on the counter seems to depend on the time control and other factors. If Lichess does not detect that your opponent has left, but they decide to run out the clock, Lichess will not allow you to claim a victory, but will still automatically penalize your opponent with a ban after repeated offenses.
Note that none of this happens in correspondence chess, as temporarily leaving the game is normal in that time control.