If anyone, not being dummy, omit playing to a former trick and such error be not corrected until he has played to the next, the adversaries may claim a new deal; should they decide that the deal stands good, the surplus card at the end of the hand is considered to have been played to the imperfect trick, but does not constitute a revoke therein.
If anyone (except dummy) play two cards to the same trick, or mix a card with a trick to which it does not belong, and the mistake be not discovered until the hand is played out, he is answerable for any consequent revokes he may have made. If during the play of the hand the error be detected, the tricks may be counted face downward, in order to ascertain whether there be among them a card too many; should this be the case, the trick which contains a surplus card may be examined and the card restored to its original holder, who (not being dummy) shall be liable for any revoke he may meanwhile have made.
THE REVOKE
A revoke occurs when a player (other than dummy), holding one or more cards of the suit led, plays a card of a different suit. The penalty for a revoke takes precedence of all other counts.
A revoke is established if the trick in which it occurs be turned and quitted, i.e., the hand removed from the trick after it has been gathered and placed face downward on the table; or if either the revoking player or his partner, whether in his right turn or otherwise, have led or played to the following trick.
The penalty for a revoke is three tricks taken from the revoking player and added to those of the adversaries.