Bbradley62, on 2011-February-25, 02:03, said:
Since this is under the "SAYC and 2/1 Discussion" topic... does it make a difference which of those two systems is being played?
No , no difference.
But there are many versions of 2/1 around. I was referring to BWS2001, and other versions might have specific agreement on this 4th suit sequence. In BWS2001, it is by default natural.