So I was playing on phone a classical game (15+15), I played my move and I needed to go to the bathroom. Since I was playing long time, I didn't mind losing a couple of minutes for that. Unfortunately, when I got on my phone again the game was ended in a victory for my opponent because I left and I don't think it's fair. I understand why this option exists, but I think it should be proportional to the playing time. If I left 1 minute in a 3 minutes game it's ok (and anyway even if I come back I think it will be hard to win anyway unless my opponent is in a hopeless position), but I should be able to left for a couple of minutes in a 15 minutes game.