In leading trumps from weakness always lead the highest card, so that your partner can discover the distribution of the suit, and place the dealer’s trumps.
As a doubled spade make does not of necessity show strength in trumps, it is not as a rule the custom of good players to lead spades, except from strength, before seeing the dummy hand. If you hold trump strength your partner has probably doubled on his suit cards, and your trump lead will insure the safety of his high cards. Should you hold a strong suit hand, your partner’s double is presumably an indication of trump strength, and the trump opening would be advisable.
With only fair strength in the side suits and weak trumps, especially where you hold a short suit, do not be tempted to lead the trump originally. Wait until you learn more of the position of the cards.
THE HEART CONVENTION
When you have the first lead and your partner has doubled a “no-trump” make, you are expected to lead your highest heart.
Under this system the younger hand does not double “no-trumps” unless he is willing that a heart should be led; and although the doubling power of the younger hand is reduced, it makes your lead, unless you have the misfortune to hold no heart, a practical certainty.
Should you hold an established suit and the ace of hearts you must, of course, double to have the heart led. When you hold an established suit of hearts, or a long suit of hearts that can be established in one lead and a sure card of re-entry, a double may save the game.
THE WEAK SUIT CONVENTION
In England and in some parts of this country, if the younger hand doubles it is a signal for his partner to lead the highest card of his weakest suit; trusting that this weak suit and the doubler’s long one will prove identical.
As this convention justifies a double with any established suit, it multiplies the opportunities to double; but, on the other hand, since the leader may have to choose between two weak suits, there is no certainty that he will make the desired lead; he may instead strike the dealer’s long suit with a disastrous result.