I’m not sure if this is a bug or a rule. I’m assuming it’s a rule because I’m still new, but it seems odd.
In a game I was playing recently (http://online-go.com/game/738220), I got into a ko fight. I won the ko fight, and then my opponent passed because the rest of the board was settled. I then passed, and my opponent immediately rejected the marked stones and played as though there hadn’t just been a ko fight (i.e. his play would have been illegal if he’d played there without passing).
This seems like the wrong outcome. If my opponent had another move, I wouldn’t have passed; I’d always understood it to be the case that two passes in a row ends the game. If there’s a dispute about the state of the game, shouldn’t the ko state of the game be preserved when play resumes? Does the game not actually end when both players pass? Is this just because of the software, or is it really the rule that if both players pass and then dispute the stones the ko threat goes away.