LEARNING CENTER

Pass. Double would be lead-directing. The 83 shouldn't get you to suggest partner leads hearts. 

8. Hi-lo with a doubleton to encourage. Partner (who leads ace-from-ace-king) will likely continue with another high heart. If you play 3-8, he won't play you for a doubleton and won't play a third round.

Discard a diamond. This will create 2 trump tricks to set the contract. It is a variant of the more well-known situation where declarer trumps with the queen from AQJxxx and you don't overtrump with K10x--thereby setting up 2 tricks. The remaining position is:

If you overtrump, that will be the last defensive trick. Whatever you return, declarer will win and play the K, revealing the position. Next comes the 10 for a marked finesse. Not overruffing with a sure trump trick often produces an extra defensive trick. In this case, once you discard a diamond, you remain with QJ75. Declarer will play the K and then the 10. You cover and will get 2 trumps tricks.

If you don't see it, lay out the cards and study. 

This was the full deal:

Please click here to play Practice Deal #3.