Let's cut the rhetoric. Two years after Civ III has been released, how many really unexpected things happen? How are they unexpected? Let me count the ways...
1) Things that take everyone by surprise
a) major things
b) minor things
2) Things that take only the DP by surprise
a) major things
b) minor things
3) Things that take only citizens by surprise
a) major things
b) minor things
4) Things that take only forum posters by surprise
a) major things
b) minor things
5) Things that take only chat goers by surprise
a) major things
b) minor things
I guess there could be more combinations but I hope these are enough to get my point across.
Now there are only two ways to decide if a chat should be stopped:
1) DP decides
2) Someone else at the game play session decides
I do not see how anyone not at the session (i.e., someone not privy to the surprise that has occurred) can stop the chat. If someone not there is worried before hand that something might happen then, if that something does happen, well, can we really say it was unexpected? If it's not unexpected then it can be planned for, nicht war?
OK, next step. Someone at the game play session is faced with a decision to stop the chat. There are two questions that person must answer:
1) Is this really an unexpected event? 2) If so then is it of significant importance to stop play?
Are these to be answered subjectively or objectively? If it's not to be objective, i.e. if there's nothing coded in that says we have to stop then it's left up to the decision maker's judgement. And if it is to be left to someone's judegement then we cannot hold them responsible for bad judgements!
It seems to me it would be much easier to take things as they come rather than try to make rules to cover all scenarios. Here are some practical suggestions:
1) Make a law stating the maximum number of turns that can be played
2) Make a game play session schedule for the whole game. For instance stipulate that sessions will be held on Wednesdays and Saturdays, time to be set by the President.
3) Allow for polls to set special cut-offs. For example, say there's a trade due to expire in 7 turns. The trade advisor wants to look at new prospects before the deal is renewed. Let him or her post a poll asking that the session be stopped after 7 turns. If the citizens approve then the session must be stopped then. The actual instruction to stop could be posted by the chief justice or head of the senate depending on who we want to entrust with the responsibility.