Where the dealer takes up the trump voluntarily, the elder hand is, of course, upon the defensive, and to lead a trump under such circumstances would be disastrous.
Should your partner have turned up the Right Bower, lead a small trump as soon as you can; by so doing you will be sure to weaken your adversary's hand.
When your partner makes the trump, or orders it up, lead him the best trump you hold.
When you hold the commanding cards, they should be led to make the "march"; but if you are only strong enough to secure your point, cards of other suits should be used.
When opposed to a lone hand, always lead the best card you have of another suit, so that the possibility of your partner's retaining a card of the same suit with yourself may be averted. If the card you lead is of an opposite colour from the trump, so much the better; for if a red card should be trump, and an opponent plays alone, the chances are against his holding five red cards. Besides, if the lone player did hold five red cards, it would, in like
proportion, reduce the probability of your partner having one of the same suit, and give him an opportunity to weaken the opposing player by trumping.
The exception to the above rule is when you hold two or three cards of a suit, including ace and king, and two small cards in other suits; in this case your best play would be to lead one of the latter, and save your strong suit, for your partner may hold commanding cards in your weak suits, and you thus give him a chance to make a trick with them, and if this does not occur, you have your own strong suit as a reserve, and may secure a trick with it.
When playing to make a lone hand, always lead your commanding trump cards first, reserving your small trumps and other suit for the closing leads. When you have exhausted your commanding trumps, having secured two tricks, and retaining in your hand a small trump and two cards of another suit, lead the highest of the non-trump suit to make the third trick, then your trump. For instance, suppose that hearts are trumps, and you hold the Right and Left Bowers and ten of trumps, and ace and nine of spades; lead your bowers, then the ace of spades, following with the ten of trumps and nine of spades. The reason for playing thus is obvious. You may not exhaust your adversaries' trumps by the first two leads, and if either of them chanced to retain a trump-card superior to your ten, by leading the latter you would, in all probability, be euchred on a lone hand.
Holding three small trumps and good plain cards, and desiring to euchre your opponents, lead a trump, for when trumps are exhausted you may possibly make your commanding plain suit cards.