grenv: I think I made a mistake, but want to be clear:
After the opponent plays 4-2 (which has to be 8/4, 6/4 or it's a mistake) then I roll a 2-2, I'm playing 24/20, 6/4(2).

Since you cleared it up, i have the impression that you would NOT play the awful 24/20 6-4(2) after a 42 of your opponent so you retract your statement i have quoted above.....
After a 42 of our opponent, if we have 22 then we should play 24-22(2) 6-4(2) or 6-4(2) 13-11(2)....