Double deception with touching honours

[oldboltoni]

[hv=pc=n&s=sa52hqj9dakcakt75&w=sqt63hat54d7632c9&n=sk87h632djt8c8642&e=sj94hk87dq954cqj3&d=n&v=0&b=1&a=pp2np3nppp]399|300[/hv]

 

I was annoyed to find myself in the minority going down in 3NT on this board in a daylong IMPs tournament. Analysis of those who did make revealed they had succeeded with one of two deceptive plays involving touching honours. The lead was ♦2. Those who inserted either the ten or J were instantly rewarded by the appearance of the Q from E. Maybe this is a better chance than Q doubleton.

Three rounds of clubs set them up, and E came back with ♥7, to give me a second chance to do the right thing with touching honours. I put in ♥Q, but W won with ♥A and switched. Down 1. All the S who played ♥J were rewarded with a ♥ return and the 9th trick.

 

Question - why does the ♥J draw the heart return? Does robot W assume I would play small from Qxx, or does it infer that playing the J still leaves the possibility to find E with KQx(x)

[Tramticket]

Playing a high diamond at trick 1 is a no-cost play. Should East get it wrong? I've no idea because I don't play with robots or understand (or like) their system - what holdings are consistent with a lead from ♦2?

 

On the ♥7 switch, West reasons that the J might be from KJ9, but if the Q is from KQ9 there are not enough points (based on the 2NT opening) for South to also hold the ace of spades - making the switch attractive.