47. If any one play to an imperfect trick the highest card on the table, or lead one which is a winning card against his adversaries, and then lead again, or play several such winning cards one after the other, without waiting for his partner to play, the latter may be called on to win, if he can, the first or any other of those tricks, and the other cards thus improperly played are exposed cards.
48. If a player or players, under the impression that the game is lost or won, or for other reasons, throw his or their cards on the table face upwards, such cards are exposed, and can be called, each player's by the adversary; but should one player retain his hand, he cannot be forced to abandon it.
49. If all four players throw their cards on the table face upwards, the hands are abandoned, and no one can again take up his cards. Should it then be proved that the game could have been saved or won, no such claim can be entertained unless a revoke be established.
50. In a lone hand, should either adversary abandon his hand by laying it face upwards on the table, or by failing to play to every trick, the party playing alone scores five points.
51. A card detached from the rest of the hand is liable to be called if either of the adversaries can name it; but should an adversary name a wrong card, he is liable to have a suit called when he or his partner next lead.
52. If any player lead out of turn, the adversaries may either call the card erroneously led, or may call a suit from him or his partner when it is next the turn of either to lead.
53. 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 except the original offender.
54. If a player who has rendered himself liable to have his highest or lowest called, fail to play as desired, or if when called on to lead one suit, lead another, having in his hand one or more cards of the suit demanded, he incurs the penalty of a revoke.
55. In no case can a player be compelled to play a card which would oblige him to revoke.
56. The call for an exposed card can be repeated until such card has been played.