THROWING THE LEAD
The disadvantage of the lead is at times most apparent, and you can often gain by forcing your adversary to lead a suit which you cannot well afford to open.
When there are tricks that the adversaries must win, try to make this necessity a benefit to your hand.
Occasions for throwing the lead arise most frequently in the end play; there are the nice situations where you gain the advantage of position by leading a losing trump or suit card.
However, situations where it is advisable to throw the lead are so frequent and varied in occurrence throughout the entire play that the subject can only be treated in a general way. Perhaps covered by one suggestion; when you cannot lead a suit advantageously, try to force the adversary to lead it to you.