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Who says 1 diamond overcall has no effect on opponents.


MrAce

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- How would u bid it ?

1 = 15+ nat/clubs or 18+ any

... 1 = 9+, 4+ spades, if balanced or 3-suited then 4+ hearts, GF

1 = relay

... 1N = 4+ hearts

2 = relay

... 2 = bal or 3-suited

2 = relay

... 2 = 44(32) or 44(41)

2N = relay

... 3 = 4414

4 = RKCB for clubs

... 4N = 2/5 -q

5 = K ask

... 6 = nope

 

The auction is identical after a 1 overcall. Of course, over the strong-ish club opening they probably overcall 2 instead...

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