17.—If your partner refuses to trump a suit of which he knows you have not the best, lead your best trump.
18.—When you hold all the remaining trumps, play one, and then try to put the lead in your partner's hand.
19.—Remember how many of each suit are out, and what is the best card left in each hand.
20.—Never force your partner if you are weak in trumps, unless you have a renounce or want the odd trick.
21.—When playing for the odd trick, be cautious of trumping out, especially if your partner be likely to trump a suit; make all the tricks you can early, and avoid finessing.
22.—If you take a trick and have a sequence, win with the lowest.
FOR SECOND HAND.
23.—With king, queen, and small cards, play a small one when not strong in trumps; but if weak, play the king. With ace, king, queen, or knave only, and a small card, play the small one.
FOR THIRD HAND.
24.—With ace and queen, play Her Majesty, and if she wins return the ace. In all other cases the third hand should play his best card when his partner has led a low one. It is a safe rule for third hand to play his highest.