THE TRUMP CARD.
91. The trump card must be left in view till played, and if removed or lifted from the pack, becomes an exposed card.
92. After the trump card has been played, no player has a right to ask what card was turned up, but can at any time ask what is the trump suit.
PLAYING ALONE.
93. A player may play alone when he orders up, assists, adopts, or makes the trump, or when his partner does so, provided that he himself has not already passed.
94. If a player declares to play alone, his partner may take it from him, subject to the previous rule; in which case the form of declaration must be, “I take it from you.”
95. A player cannot play alone when he or his partner is ordered up, or when his adversaries adopt or make the trump, or if before making his declaration he exposes a card.
96. The dealer must announce his intention to play alone before quitting his discard.
97. A player must announce his intention to play alone before naming the trump, otherwise he can be required to play the hand with his partner.
98. In all cases a single declaration must be made. It is not permitted to say, “I order it up and play it alone,” or “I make it hearts and play it alone.” The declaration must be, “I play alone at hearts,” or, “Alone at hearts.” Any other declaration precludes a lone hand.