What's the final score?

I would agree with that.  Only exception being a walk off HR.  Similar to a regular game, bottom of 9th (or 7th).  Only the go ahead run counts - except in the case of a multi-run HR.

I agree with both of you.  In most cases there wouldn't even be a play made in the of if the first run scored. 

That's how I have scored it in the past too...

That is correct.  Make sure if it is 2 outs, the batter who hit the game winner touches 1st.

Not an ump but going to play devil's advocate for a second.  If the rule is in fact worded "10 or more runs" would that not imply that the score differential can in fact be greater than 10?  If 10 were the limit, shouldn't they word it "upon reaching a 10 run differential the game shall end" or something like that?

I would think that the "or more runs" is in there in the case that if the home team is down by more than 10 runs, they get their last at bat in the bottom of the inning.  The game will end if they are still down by 10 or more runs.  If they didn't add the "or more runs", you could argue that the statement only applies if the team is down by exactly 10 runs.  Can't have that!!  

IMO, it only implies it for the home team.  Visitors could score & be up by more than 10 in that last inning.  Home team still gets to bat in the bottom of the inning.

Beat me to it...

Again, looking at the exact wording, the "after the 5th inning" reference has only the 10 run differential - not 10 or more.  But more importantly, can you explain the HR exemption and possibly the reference to having batter touch 1B if there were 2 outs?  How are either of these relavent when play apparently stops immediatley upon the 10th run getting plated?  Is there some implication that play needs to reach a natural, or unnatural, stopping point?  What about a ground rule double?

All in good fun!

This thread reminds me of a situation where it didn't really matter if my son was on deck or not.

Son's HS team is the home team, up by 9 runs in the 5th inning, two outs, bases loaded and son is on deck.  No matter what the batter at the plate does (hit, out or walk), the game is either,  over (10 run rule) or they are headed out to the field for the 6th inning.

On the touching first base, if the runner doesn't make it safely to first, the run can't be scored.

H is winning by 9 with the bases loaded.

 If there's a home-run, H wins by 13.  If the ball stays in the park, H wins by 10, even if all runners advance to and touch the plate.