When partner opens one of a minor and RHO makes a takeout double:
- It’s important to agree on the requirements for responder’s redouble, and on how the auction develops after a redouble.
- It’s important to agree on the requirements for responder’s one heart and one spade calls.
When partner opens one of a minor, and RHO overcalls one diamond / heart / spade, it’s important to agree on the requirements for responder’s negative double. And after you make a negative double, it’s important to agree on the meaning of opener’s rebids of one heart and one spade.
When partner opens one diamond and RHO overcalls two clubs, it’s important to agree on the requirements for responder’s negative double.
The following are not essential, but if you play ‘inverted minors’ (which we recommend):
- Agree whether the jump raise is always weak and distributional, always suitable for three notrump if opener is strong and balanced, or can be either type.
- If the single raise can be invitational strength, agree on how to stop below game.