PassedOut, on Dec 3 2007, 10:04 AM, said:
Never heard of redouble here as anything but an offer to play. You've got to be able to introduce some risk for opponents who double for a lead.
In some partnerships I play here that redouble shows about this kind of club holding (perhaps a fourth club would be advisable). Pass shows either a strong inclination to play 3
♣ redoubled or no desire whatever to play 3
♣ redoubled but no descriptive call to make for the moment (three of a suit, including diamonds, shows five). Responder will redouble unless he doesn't want to play 3
♣ redoubled even if opener does. In that case he will proceed as if opener had bid 3
♦.
This seems to combine the "make 'em pay" approach with the "don't let them mess up your normal auction" approach fairly well. It has had a good success rate on the occasions it has occurred at the table.
2NT - P - 3♣ - Dbl
ReDbl - All Pass