82. 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.
83. 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.
84. 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.