No, this post is not about a bridge player who went racing around on icy Midwest streets. It's about a nifty convention that can be beneficial in disrupting the oh-so-scientific auctions that Precision system players are able to wreak upon their opponents.
Larry Cohen has all the details about CRASH ("color" - "rank" - "shape") - and how to employ this convention.
When your opponent opens with a Precision (or any other Strong, Forcing and artificial) 1
, I recommend trying to interfere. Best is to preempt (the higher the better), but if you can't preempt, it is useful to be able to show a 2-suiter and hope partner can preempt.
CRASH is a method to show all 2-suiters.
Note that CRASH is not a simple convention to play. Larry recommends that only experienced players attempt to CRASH against their big club opponents. If, however, you wish to take on the challenge, you may find yourself rewarded with a nice pot of matchpoints or IMPS!