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Rule of 10 - When contemplating a penalty double beneath opponent's game, consider the following criteria:

1.

Combined partnership HCP is 20+

2.

Misfit with partner

3.

Trump winners plus opponent's bidding level is 10+

Example: Assuming partnership holds 20+ HCP and no partnership fit. 

You hold A Q x (2 winners) in Right Hand Opponent's major suit, with the opponents continuing biding the suit at the 2 level (8 tricks). 

Since 2 + 8 = 10, a penalty double is warranted.

Opponents' Bidding Level

Tricks
Required

Number of Trump winners
required to Double
(assuming partnership misfit)

1

6 + 1 = 7

10 - 7 = 3
2

6 + 2 = 8

10 - 8 = 2
3

6 + 3 = 9

10 - 9 = 1

Also see Environmental Factors

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