70.--If the third hand play before the second, the fourth hand may play
before his partner.
71.--Should the third hand not have played, and {179} the fourth play
before his partner, the latter may be called on to win or not to win the
trick.
72.--If any one omit playing to a trick, and such error be not discovered
until he has played to the next, the adversaries may claim a new deal;
should they decide that the deal stand 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.
73.--If any one play two cards to the same trick, or mix his trump, or
other card, with a trick to which it does not properly belong, and the
mistake be not discovered until the hand is played out, he is answerable
for all consequent revokes he may have made.[61] If, during the play of the
hand, the error be detected, the tricks may be counted face downwards, in
order to ascertain whether there be among them a card too many; should this
be the case they may be searched, and the card restored; the player is,
however, liable for all revokes which he may have meanwhile made. If no
revoke has been made, the card can be treated as an exposed card.