It is the Quarter-Finals of the Senior KO in Denver. You are playing an old rival, an expert player and author who has given you a lesson or two over the years. Going into the fourth quarter you have a big lead, but your team needed one more swing in the 3rd quarter to earn an early dinner. On the second board you pick up a dull hand:

Spade Graphic Q63Heart Graphic 873Diamond Graphic 1072Club Graphic J743

Partner opens 1Club Graphic and your old rival bids 4Heart Graphic, red on white. Everyone passes and you lead the club 4 and look at the dummy:

Spade Graphic 9754
Heart Graphic 5
Diamond Graphic Q985
Club Graphic KQ108

Partner wins the ace and returns the Spade Graphic 2, declarer winning the A. Declarer now tries the J Diamond Graphic, but you give count and partner ducks. Unable to reach dummy, declarer eventually loses a trick in each suit for down one.

His hand: Spade Graphic AJ, Heart Graphic AQJT962, Diamond Graphic AJ3, Club Graphic 2.

As your old friend (and current screenmate) is sorting his cards for the next board he asks if you had the Diamond Graphic 10. When you admit that you did, he mutters under his breath, “Hmm, I could have made it….” Meanwhile, as dealer on the next hand he has placed his card on the tray. What should you do?