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Rule of 20 - Refers to a secondary hand evaluation methodology when a hand does not have sufficient strength to open bidding using a traditional point count. 

A player may open the bidding when the High Card Point sum added to the number of cards held in the two longest suits totals 20 or more. 

Note: the player's honors should be in the long suit/s, not side suits (i.e., no defensive tricks)

High Card Points in 2 longest suits

Combined number of cards in 2 longest suits

Sum

9

11

9+11 = 20
10

10

10+10 = 20
11

9

11+9 = 20
12

8

12+8 = 20

Also see Rule of 15

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