Much has been written and said about the rule of 20 for deciding whether to open the bidding. It is one of many “rules” floating around in the bridge world.
The rule of 20 is one that, by and large, should be ignored.
No one asked me, but I have an opinion about the so-called rule of 20. After seeing many articles defending it, even praising it, I am moved to argue against it. Someone has to. I have seen many bad bridge bids made and then defended as being examples of this rule. In my lectures, a common moment of contention comes when someone gets a lousy result and proudly defends the bid because it followed the rule of 20.
It pains me to define the rule of 20 because it comes with too many warts to make it a legitimate tool, but here it is: If the number of cards in your two long suits and your high-card points add up to 20, you should open the bidding. Here is an example of the rule of 20 at work. You are the dealer with no one vulnerable. It is a simple situation without extraneous variables at work.
♠Q 8 7 5 4 ♥ K 4 ♦K ♣ Q 9 7 6 4
This hand has 10 high-card points and the two long suits, spades and clubs, add up to 10. By the guideline of the rule, you should open.
I am appalled.
If you open this hand 1♠, I would ask what auction you would like to hear. If your partner doubles an enemy contract, where are your tricks? If your opponents double you, what are your chances?
Here are some hands on which the rule of 20 might be invoked in deciding on whether to open. Every one of the hands has exactly “20” points. Remember that you are in first seat with no one vulnerable. What is your call?
1.♠Q 7 ♥ A 6 5 4 2 ♦7 ♣ A 10 6 5 3
3.♠8 ♥ K 8 ♦K 8 7 6 5 ♣ K J 9 4 2
4.♠A 10 9 7 5 ♥ A Q 9 5 3 ♦4 ♣ 5 3
5.♠7 ♥ A Q J 7 6 5 ♦K 7 6 4 ♣ 9 4