South ends up declaring 6♦ after a 2♣-P-2♦ start. Opponents were shockingly silent throughout.
West leads the spade 10 (I like that lead), and the Jack of spades from Dummy wins.
I set about the percentage line, but luck was not on my side. For those who like intermediate-level declarer play issues, this one offers a nice example. BTW, diamonds split 3-0, with LHO (West) having three diamonds.
As an aside, after you work out the percentage line, you might find it amusing to also figure out the alternative very anti-percentage line, which happens to make, of course.