Here's another tricky hand from the same set.  Again I have to decide who has a side card and set up an endplay accordingly. 

974 / AKQJ / A53 / AK8

 

2nd all red.

 

Righty opens 2 Diamonds.

 

21 high, starting with double and then bidding NT looks right. 

 

Jeff bid 2 Spades, I bid 2NT and he raised to 3.

 

LHO led the King of Spades

 

A632 / 97 / J42 / J974

 

974 / AKQJ / A53 / AK8

 

I ducked the Spade and LHO continued with the Ten.  Do you duck again or win the Ace?

Ducking again is a big winner if Spades are 3-3.  That will allow you to score your 9th trick in that suit.  How likely is that?  Almost impossible, I'd say.  Why isn't Lefty leading his 5 card suit or his singleton in his partner's suit instead of Dummy's suit.  He'd have to have specifically KQT and likely would have switched at trick 2, or at least continued with the Queen.

What's the harm in ducking again, though?

Your plan should be to score your 9th trick in Clubs.  Dummy's entryless condition (once the Spade Ace is gone) makes that somewhat problematic.  The most straightforward plan appears to be stripping the Hearts, cashing the Ace of Diamonds (Diamonds sound like they're 6-1 on the auction) and throwing Lefty in with a Spade forcing him to lead a Club.  However, if you duck the second Spade (and win the third) you have no Spade left in your hand to throw him in with.

I ducked again and Righty pitched a Diamond.

I won the third Spade and cleared Hearts (Lefty has 4.)  Now I have a count on the hand (though it's too late to do much with it.  Lefty is 5-4-1-3 and Righty is 1-3-6-3.

Righty has never pitched a Club, so he's got 3 in each minor left. 

- / - / J4 / J974

- / - / A53 / AK8

I played Ace and a Diamond and Righty cashed his last Diamond and played a Club.  Lady Luck was with me and I claimed +600, worth 8 IMPs and change.

Winning the 2nd Spade and endplaying LHO also works, if you guess to play him for the Ten of Clubs.  The best line double-dummy is actually to win an early Spade, clear Hearts, and play 3 rounds of Clubs, endplaying Righty in Diamonds (you score an extra trick in both minors that way.)

Lynn Deas ducked 2 Spades as well, but she didn't have the inference of a 2 Diamond opener.

LHO

KQJT8 / T432 / 7 / T53

RHO

5 / 865 / KQT986 / Q62