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THE RULE OF 9

It's always difficult to make a penalty double so I am always on the lookout for hints.

 

Does anyone use the rule of 9?

1. Take the level of the contract.

2. Add the number of the opponent’s trump suit you hold.

3. Add the number of honors you have in that suit.

4. If it comes to nine, DOUBLE

It hasnt worked for me yet... nor for my opponent on this deal:

West
109742
4
J1042
965
North
65
J1072
KQ
KQJ74
East
AJ8
AQ63
A9653
3
South
KQ3
K985
87
A1082
D

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