75. Should the dealer indicate that all or any of the remaining tricks are his, he may be required to place his cards face upwards on the table; but they are not liable to be called.
76. If either of the dealer's adversaries throws his cards on the table face upwards, such cards are exposed, and liable to be called by the dealer.
77. If all the players throw their cards on the table face upwards, the hands are abandoned, and the score must be left as claimed and admitted. The hands may be examined for the purpose of establishing a revoke, but for no other purpose.
78. A card detached from the rest of the hand of either of the dealer's adversaries, so as to be named, is liable to be called; but should the dealer name a wrong card, he is liable to have a suit called when first he or his partner have the lead.
79. If a player, who has rendered himself liable to have the highest or lowest of a suit called, or to win or not to win a trick, fail to play as desired, though able to do so, or if when called on to lead one suit, lead another, having in his hand one or more cards of that suit demanded, he incurs the penalty of a revoke.
80. If either of the dealer's adversaries lead out of turn, the dealer may call a suit from him or his partner when it is next the turn of either of them to lead, or may call the card erroneously led.
81. If the dealer lead out of turn, either from his own hand or from Dummy, he incurs no penalty; but he may not rectify the error after the second hand has played.
82. If any player lead out of turn, and the other three have followed him, the trick is complete, and the error cannot be rectified; but if only the second, or the second and third, have played to the false lead, their cards, on discovery of the mistake, are taken back; and there is no penalty against any one, excepting the original offender, and then only when he is one of the dealer's adversaries.
83. In no case can a player be compelled to play a card which would oblige him to revoke.