Here's a head scratcher that appeared late last night in the Friday evening club tournament. Opponents are solid bidders and 4♠ will be the works. Yours is not a regular partnership and double is undiscussed here, 4NT would be RKCB in hearts. It's unthinkable to pass as both sides probably have game, plus you have the advantage of knowing 10 cards of LHO which will not be the case at most other tables. Could just KISS with a natural 5♦, but it seems better to keep clubs in the picture if possible. Double? Your thoughts with these agreements, or indeed your own?
For experts, what agreements would an expert pair be likely to have here and would they be able to depict North's hand, given the auction? What would you be thinking as North?