Hey, Mr. Bridge Guy
I’m confused about guidelines in doubling for penalty using the Rule of 9. Thanks for your help.
In My Opinion: The Rule of Nine
Before I received this question, I had never heard of the Rule of Nine. I had to look it up. It says that if partner opens one spade, and there is an immediate overcall of two hearts, how do you determine if you have the right trump holding to pass for penalties if partner reopens with a double?
So suppose you hold KQ874 of Spades. The Rule says that you add three numbers:
The level you are at – 2
How many trumps you have – 5
How many honors you have in the trump suit – 2
Since the total is nine, you may pass for penalties.
I see some problems with this rule. For example: AQ97 and J1042 both have 4 trump and 2 honors. The AQ97 is worth 3 tricks on defense, while the J1042might be worth only one trick. They both add up to six (counting the 10 as an honor).
Second, vulnerability is never mentioned. It is more tempting to double vulnerable opponents if they step out of line.
Third, if the opponents have located an eight-card major fit and are at the two level, a penalty pass may tip off declarer how to play the trump suit.
I believe that using good judgment is better than relying on the Rule of Nine.
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