Here are some more hands to consider in the context of the discussion of the rule of 20.
1.♠ 8 2 ♥ J 7 6 2 ♦9 ♣ A K Q 10 5 3
3.♠ K Q ♥ K Q 2 ♦Q 6 5 3 ♣ 9 6 5 3
4.♠ A ♥ K Q 7 3 ♦K 10 5 3 ♣ 7 5 4 2
Here is some advice: If you have a hand that seems to be an opener, if using the 20-point rule, consider these things:
Is my shape going to give me easy rebids?
Are my values quality points or are they junk?
Do I have any defensive values?
Should I preempt instead of opening at the one level?
Frankly, the big majority of “20-point” hands fail at least one of these four questions.
For those who like rules, the rule of 20 is a step in a useful direction. Here’s a better idea: Change the rule of 20 to the rule of 21 and a half.
You will have to use your judgment as to what constitutes a “half ” point, but having 10s and 9s in your long suits is a good start. Read on for how a simple adjustment can change a non-opener to an opener.
Change ♠ A Q 7 6 4 ♥ 4 ♦4 3 ♣ A 8 7 6 4
to ♠ A Q J 7 6 ♥ 4 ♦4 3 ♣ A 10 9 6 4
and you have a fine opening bid. You have defense, two quality suits, and you have increased the chances of making a game in one of your suits or even in notrump.
Change ♠ 8 ♥ K 8 ♦K 8 7 6 5 ♣ K J 9 4 2
to ♠ 8 ♥ A 8 ♦K 10 8 7 4 ♣ K J 9 8 4
and you have a hand with some defense and better spots in your long suits.
Change ♠ 7 ♥ A Q J 7 6 5 ♦K 7 6 4 ♣ 9 4
to ♠ 7 ♥ A K J 7 6 5 ♦K 10 7 6 ♣ 9 4
Your heart suit is better and the diamonds rate to be easier to play now that you have the ♦10 to work with.