Caitlynne, on 2016-August-09, 09:29, said:
If LHO plays a smaller spot than the 9, you next have to decide whether it is more likely that LHO began with 2 or 3 cards in the suit. If you think it is 2 cards, you simply continue as if LHO had played the 9. If you think it is more likely to be 3 cards, you return to hand and lead the Jack, hoping to pin the now singleton 9 with RHO as you finesse for the high honor against LHO.
This isn't right. After the ten loses to an honor, it's overwhelmingly better to cash the ace next. Trying to pin the 9 basically caters to two holdings, Q9 and K9 with RHO. Cashing the ace caters to 4 Qx/Kx combos with LHO and KQ doubleton with righty. It's never a close decision once you've embarked on this path.
If LHO is marked with length enough to change the best line (e.g. RHO has 2 fewer vacant spaces), you are supposed to try to run the J first round.
Quote
If LHO began with K9x or Q9x, there is no legitimate way to play this suit combination to produce 3 tricks.
No, you can run the J, and hook the ten next round. Or if LHO covers the J, on second round you can play low to t and duck if the 9 isn't produced. This is a reasonable play if the bidding/previous play have marked LHO as more likely long in the suit.