|REQUIREMENTS FOR A PREEMPTIVE BID|
|Less than opening hand strength.|
|A 7-card or longer suit which is headed by|
2 of the top 3 honors or by 3 honors altogether.
|Be bolder not-vulnerable, more cautious vulnerable.|
Mathematical Interlude: Skip as much as you want.
At Duplicate or Chicago scoring, an opponent's 4♥ game is worth either 420 or 620, depending on the vulnerability. At Rubber Bridge scoring the value is not so clear, because sometimes when you make a sacrifice to stop them from completing a 500 Rubber they get it on the very next hand anyway. So we will assume that the games have about the same value as they do at the other forms of scoring.
At all scoring;
Doubled Not-Vulnerable undertricks are 100 - 300 - 500 - 800
Doubled Vulnerable undertricks are 200 - 500 - 800
Let us assume that they really can make a game but that our preempt will keep them from finding it.
Let us also assume that they will double us to try to get even.
The Rule of 2 and 3 (also called the Rule of 500) says:
Estimate how many tricks your side can win.
Then, if Vulnerable, make a preemptive bid 2 tricks higher than the estimate.
Or, if Not-Vulnerable, make a preemptive bid 3 tricks higher than the estimate.
That Rule is pretty good as a rule. :-)
But some Duplicate Bridge players may think they need more precision than saying that 500 points is "about the same" as 420 or 620. So they need to look at these four tables:
If you want to make a rule using this data you would have to call it the Rule of 1, 2 and 3.
At Favorable Vulnerability (we aren't, they are) you can go down 3.
At Equal Vulnerability (both the same) you can go down 2.
At Unfavorable Vulnerability (we are, they aren't) you can only go down 1.
End of Mathematical Interlude:
|GUIDELINES FOR MAKING A PREEMPTIVE BID|
|Make an estimate of how many tricks your hand will actually take with your suit as trump.|
|7-card suit||With a 5-trick estimate preempt at 3-level only if Not Vulnerable*|
With a 6-trick estimate preempt at 3-level at any Vulnerability
|8-card suit||With a 6-trick estimate preempt at 3-level|
With a 7-trick estimate preempt at 4-level
|DO NOT PREEMPT TWICE WITH THE SAME HAND|