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The Rule of 11

Use after a No Trump opening

If the lead is 4th from top (an honour)

Deduct the face value of the lead card from 11

The result is the number of cards higher than the lead card held in the other three hands

Example

Declarer deducts 4 from 11 - there are 7 cards higher than the 4 held by West, Declarer and Dummy.

Declarer can see 5, 6, 7, 10, J, Q .

West must hold from 8, K, A - East holds an honour - so A or K in West's hand