Chances to get the dark blue redouble card out of the bidding box are few and far between. It is sometimes used for rescue or to confirm a first round control or a good hand but very rarely in anger.
On the deal above from the Deva Congress Swiss Teams Michael Newman used it to good effect. After South had opened a weak notrump and North transferred to spades, Ollie Burgess bid his longest suit, South showed a spade fit and this went back to Ollie who now showed a strong six-five hand by bidding four hearts. North bid four spades and Michael showed his heart support. When South doubled five hearts Michael showed his faith in partner's bidding by redoubling. There were no problems in the play once Ollie had ruffed the opening spade lead with the seven and played the heart king which pinned the singleton queen. Twelve tricks rolled in for an unusual score of 1600. To win IMPs it was necessary to redouble as Catherine Draper and Andrew Woodcock had also doubled five hearts in the other room for a score of -1050.
Thanks to Michael Newman for reporting this deal.