As the younger hand, infer from your partner’s discards what suit he is guarding.
When the dealer can lead through a king in your hand, try to keep it twice guarded.
It would be unwise to discard from an established suit if you hold a sure re-entry card; as all you require is the lead, the best discard is from the suit containing the re-entry card.
If you hold a tenace or strength in a suit over the dummy hand, it may be a better discard than your longest suit.
When your partner has shown a four or five-card suit, don’t look to him for much further strength.
Protect all four-card suits even if they are but to the nine or ten, and remember a jack or ten twice guarded will often block the dealer’s suit.
Watch the dealer’s discards and protect the suit that he is saving.
THE REVERSE DISCARD
In discarding, the play of a high and then a lower card reverses the original meaning of the discard. If you adopt the strength discard, and wish to throw away your weak suit at “no-trump” do so by discarding first a high and then a lower card. If you use the weak discard and wish to protect your weak suits, discard first a high and then a lower card from your strong suit.
The reverse discard may be used when it is shown that two discards can be made.