card combination

AQ9
xxxxx

Play up to the 9. Assuming it loses to the Jen or Tack, lead up again. If a second small one appears, you should play the A. RHO has either KT, KJ, or JT. It's a restricted choice scenario; so play him for KT/KJ.

LHO can break this by playing a JT when you lead the first round of the suit! So what happens then? In the real world, I would probably always play for LHO to have split from JTx. (He has to do this in order to give you a losing option.)

However, if LHO is good enough to do this from Jxx/Txx, then he either has Jxx/Txx or JTx. Is this a restricted choice situation (LHO must play a big one from these holdings), so you should still play for KT/KJ on your right!?!?

My head hurts.