All cards exposed by the dealer's adversaries are liable to be called,
and such cards must be left face upward on the table.
* * * * *
The following are exposed cards:
1st. Two or more cards played at once.
2d. Any card dropped with its face upward, or in any way exposed on
or above the table, even though snatched up so quickly that no one
can name it.
3d. Every card so held by a player that his partner can see any
portion of its face.
* * * * *
A card dropped on the floor or elsewhere below the table is not an
exposed card.
* * * * *
If two or more cards be played at once, by either of the dealer's
adversaries, the dealer shall have the right to call which one he
pleases to the current trick, and the other card or cards shall remain
face upward on the table and may be called at any time.
* * * * *
If, without waiting for his partner to play, either of the dealer's
adversaries should play on the table the best card, or lead one which is
a winning card, as against the dealer and dummy, or should continue
(without waiting for his partner to play) to lead several such cards,
the dealer may demand that the partner of the player in fault win, if he
can, the first, or any other of these tricks, and the other cards thus
improperly played are exposed cards.
* * * * *
If either or both of the dealer's adversaries throw his or their cards
on the table face upwards, such cards are exposed and are liable to be
called; but if either adversary retain his hand he cannot be forced to
abandon it. If, however, the dealer should say, "I have the rest," or
any other words indicating that the remaining tricks are his, the
adversaries of the dealer are not liable to have any of their cards
called should they expose them, believing the dealer's claim to be true,
should it subsequently prove false.
* * * * *
If a player who has rendered himself liable to have the highest or
lowest of a suit called fail to play as directed, or if, when called on
to lead one suit, lead another, having in his hand one or more cards of
the suit demanded, or, if called upon to win or lose a trick, fail to do
so when he can, he is liable to the penalty for revoke, unless such
play be corrected before the trick is turned and quitted.
* * * * *