86. Should the third hand not have played, and the fourth play before his
partner, the latter (not being Dummy or his partner) may be called on to
win, or not to win, the trick.
87. If any one (not being Dummy) omit playing to a former 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, or
should Dummy have omitted to play to a former trick, and such error be not
discovered till he shall have played to the next, 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.
88. If any one play two cards to the same trick, or mix a card with a trick
to which it does not properly belong, and the mistake be not discovered
until the hand is played out, he (not being Dummy) is answerable for all
consequent revokes he may have made. 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 (not being
Dummy) is, however, liable for all revokes which he may have meanwhile
made.