Circumstance: Partner bids one of a major, and the opponent in the direct seat doubles. Responses:

1. Redouble: 10+ points, fewer than three pieces in the major. This is the standard treatment of “Redouble implies no fit.”

2.1♠ after a 1♥ opening: 4+ spades. Unlikely but possible.

3. 2♣: three-piece constructive raise.

4. 2♦: four-piece constructive raise.

5. Simple raise: three-piece support with fewer than eight support points.

6. Jump raise: four-piece support with fewer than eight support points.

7. 2 of other major: four-piece limit raise with a singleton. Opener bids 2NT to ask for singleton. If interference, opener doubles to ask for singleton. Responder doubles (stolen bid) or bids the singleton.

8. 2NT: standard Jordan with no shortness.

9. 3 of an unbid suit: Fit-showing jump with three-card support and no shortness.

10. 4 of an unbid suit: Fit-showing jump with four-card support and no shortness.

11. Jump to 4: Standard weak freak: five or more trumps, less than ten points, and shortness.

12. 1NT: artificial, forcing relay to 2♣. Responder’s second calls are listed below.

1. Pass: weak hand with long clubs and no support.
2. 2♦: weak hand with long diamonds and no support.
3. Simple raise: three-card limit raise.
4. 2 of other major: four-piece limit raise with a void. Opener bids 2NT to ask for void. If interference, opener doubles to ask for void. Responder doubles (stolen bid) or bids the void.
5. 3 of a minor: invitational values, long minor with no support.
6. 2NT: 5-5 in the minors, singleton or void in opener’s major.

Note that the jump raise after the relay is not defined.