Larry Cohen

Just what we need — another rule!  Actually, this one is a bit archaic, but has some merit. It concerns preempting and vulnerability.

Unfavorable – «2»

I am a big believer in observing the vulnerability when preempting. If «Unfavorable» (Vulnerable against Not Vulnerable), I recommend being sound and cautious. The Rule of 2,3,4 states that when at this unfavorable vulnerability, you should be within 2 tricks of your bid. So, let’s say you have this hand, vulnerable against not:

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