McduellMUG: the moves are determined by the time limit, the game you are in has a 7 day time limit so a move will be made every 7 days from the start of it at which time lowest bid in each round will "fall in" which means "be done for that game".
As far as points(BKR), It's never been fully explained, but its kind of like averaging wins from everybody that has fallen in before you against losses to everybody you have fallen in before, but more complicated.