Should the third hand not have played and the fourth play before his
partner, the latter (not being dummy or dealer) may be called upon to
play his highest or lowest card of the suit played, or to win or lose
the trick.
* * * * *
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.