no. Over a high level(assume it's A) preempt, pull the double with the hand consisted in a certain offendsive tricks:A-1.when you decide to bid on A+1 level, of course, it need (A+1)-1=A. for example:bidding:4♠-(x)-p-(?)you have to pull when you hold: x Kxx KQxx Kxxxx The offendsive tricks is 6+: 3 on ♣,2 on ♦,1 on ♥, and some extra.so you have to pull,bid (6-1)=5,ofcz bid slam sometimes for it's extra. Changing ♦Q to ♠,it's the verge to passout.Even though holding 2236 shape,many player prefer to pass it under favorable VULnerable.