so no matter if you transaction was the first or the last as the only thing that matters is you transaction id
... and the date. If they let enough others jump in front of you that your bet is put off until the next day they your lucky number will be different, since they use a different secret each day.
hmmmm, you're right, didn't think about this situation. So, looks like satoshidice can cheat (
but I'm sure they aren't doing this) in this rare situation. Well, Nothing is perfect.