Run the
♣ 9 and then the J. If RHO wins either of these and returns a
♦, we need 4
♠ tricks. Cross and finesse.
If RHO wins the 1st or 2d
♣, and doesn't return a
♦, win a
♠ return in hand, and lead a
♥, playing for split honors. If LHO pops an honor, win it and force out the remaining honor. If RHO returns a
♣ after winning the K, take the
♠ finesse.
If the
♣ J wins, abandon them, and play for split
♥ honors, either by finessing 2x, or by forcing out the remaining honor if LHO pops with one. This is fine if
♦'s were 4-4, and only loses if they were 5-3 and LHO started with both
♥ honors.
It's occurred to me that maybe
♦ were 3-5 to begin with, but if so, I think I'm beat! I'm not sure how deep this analysis is, but I think it's how I'd play ATT.