pran, on 2018-October-02, 02:36, said:
In the youth of contract bridge (as the story goes) Ely Culbertson was asked and answered that the following action by declarer was according to the laws and therefore perfectly legal:
Declarer was in a 3NT contract which opponents could set directly from the opening lead. However, Declarer revoked (deliberately) and thereby established a stopper. He then made his contract with sufficient tricks to pay the prescribed revoke penalty for a final result of 3NT just made!
I believe that was what caused (the equivalent of) Law 64C to be inserted in the laws.
Actually, in 1933 this provision was present:
LAW No.39
Inquiries Regarding Possible Revoke
(a) Any player may question any other player as to whether his lead or play constitutes a revoke (except that Dummy may question only Declarer), but the question or the answer made thereto shall not be deemed to have corrected a revoke otherwise established.
(b) Either adversary or Declarer (as the case may be) may demand that a correct card be substituted for the revoking card, in which case the offender is subject to the penalty for a corrected revoke, but not to the penalty for an established revoke.
It thus was possible to require the revoke to be corrected. what might be interesting is the effect of not correcting the revoke as required.... since not doing so would be an additional revoke:
LAW No.38
Revoke Penalties
(a) Corrected revoke by an adversary.
Penalty: Declarer may elect (1) to treat the card played in error as exposed, or (2) to require the offender to play his highest or lowest card of the suit led.
(b) Corrected revoke by Declarer.
Penalty: If the left-hand adversary has played after the revoke, he may require Declarer to play his highest or lowest card of the suit led; no penalty if the left-hand adversary has not played.
© Revoke by Dummy, whether corrected or established. No penalty.
(d) Established revoke by Declarer or an adversary.
Penalty: For the first revoke, two tricks won by the revoking side are surrendered to the other side; ‘for each subsequent revoke by the same side, one trick is so surrendered, except that no transfer of tricks shall include any trick won before the first revoke occurred, nor any trick transferred from the other side in payment of a previous revoke. Penalty tricks are scored exactly as though won in play.