gringo: You are correct; if you and your opponent can't agree, you can continue to play it out. Of course, this should generally just clarify what you were disagreeing about, and usually won't change the outcome of the game. You could go on playing like this into impossible circumstances until the board is full of places you can't move, but it's considered bad form not to pass when the game can make no real progress or resign when it's obvious you're going to lose. The general idea is that you pass once you know there's nothing more you or your opponent can do to gain territory (or when you are so far ahead that the game should end now). Your opponent can still keep playing, but if you've calculated things out, it won't do any good.

headius: Thank you. Ok, I am also refering to a permanent disagreement between the players about dead stones. What does happen then? Message to Fencer? Consider this situation: I pass, my opponent passes, I mark dead stones, he disagrees. Now the program gives the oportunity to prove the situation and it's my turn. But when I now put a stone it will diminuish my points or am I wrong? Maybe I am also just exaggerating and this one point is not important, don't know. Anyway. Thanks for the answer.

gringo: generally that doesn't happen, since most everyone here will learn quickly what stones are dead; but if you ran into that situation, the best plan would be to just go on killing those groups you think are dead. Yes, you'll be playing in your own territory, but he'll have to make a move too which will either give you a point (moving in your territory) or take one away from him (moving in his own territory. It would be foolish to carry on this way, but eventually his dead groups will be really dead and the game will be so slanted he'll have no choice but to resign.

If even then he refuses to submit, you can play until there's no dead groups and a bunch of one-square openings left on the board. At that point, nobody can move, there are no contested groups, and the game will be over.

I suppose there could be a case where someone refuses to accept defeat EVER, but I hope they'll be very rare. Perhaps that's a good question...in the off change that someone never accepts the result, how shall the game end? I know of no rules to govern that situation, since generally it would be so distasteful that it does not happen.