If either of the dealer's adversaries lead out of turn, the dealer may
call the card erroneously led, or may call a suit when it is the turn of
either adversary to lead.
* * * * *
If the dealer lead out of turn, either from his own hand or dummy, he
incurs no penalty; but he may not rectify the error after the second
hand has played.
* * * * *
If any player lead out of turn and the other three follow him, the trick
is complete and the error cannot be rectified; but if only the second,
or second and third, play to the false lead, their cards may be taken
back; there is no penalty against anyone except the original offender,
who, if he be one of the dealer's adversaries, may be penalised as
provided above.
* * * * *
In no case can a player be compelled to play a card which would oblige
him to revoke.
* * * * *
The call of an exposed card may be repeated at every trick until such
card has been played.
* * * * *
If a player called on to lead a suit have none of it, the penalty is
paid.