premiere demotes three to league A
league A promotes three to premiere, demotes 3 to B1 and B2
B1 and B2 each send the top player to A, as well as the better of the two runner up players; 3 each are demoted from B1 and B2 to C level
C1, 2, and 3 each promote the top two players; 3 players are demoted from each one to D level
D1, 2, 3, and 4 promote top two players from each, plus the top 3-ranked player; presumably no one is demoted from D, unless they are booted from the tournament for CD or something.
Is only true if there are no drop outs... which there have already been. If destp is first or second in B-level, and stays up in A level then all firsts and seconds will get promoted, for instance.