I'd like to have comments on which card to lead from QJxx and JTxx at a suit contract.
Beginner's books teach us to lead the top honor at suit contract and lead low in a NT contract (unless we hold at least 8 or 9 as the 3rd card).
Lawrence in "Opening leads" gives a small preference to the Q vs suit contract rather than leading small (based on some computer simulated deals).
Blackwood in "The complete book of opening leads", also gives a slight preference to leading Q vs suit.
Yet I have met quite a few experts who prefer to lead low from QJxx, and when I asked them why they said: "I have to find anywaythe 10 in pard's hand, oytherwise even leading Q wastes a trick. Furthermore leading low is harder to read from opponents, and it sometimes happens that, even when it should waste a trick, declarer does not make the right play at trick 1. OIt is true that it is harder to read also from pard , but in any case it is an attitude lead so pard will return the suit anyways, and defenders benefit more than declarer of the concealed location of honors. ".
I have started experimenting leading low from QJxx vs sit, with good and bad results, and it seems to me that one should lead a honor or a low card *according to the circumstances*.
*according to the circumstances* is a very clever expression, but says nothing
For example: what inference I shd draw according to the fact that LHO or RHO has length or shortness in the suit ? etc etc..
Thanks !!!

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ing) tr. v. - Any bid made by bridge player with which partner disagrees.