58. After the final declaration has been accepted, the play begins; the player on the left of the declarer leads.
DUMMY.
59. As soon as the player on the left of the declarer leads, the declarer’s partner places his cards face upward on the table, and the declarer plays the cards from that hand.
60. The partner of the declarer has all the rights of a player (including the right to call attention to a lead from the wrong hand), until his cards are placed face upward on the table.[13] He then becomes the dummy, and takes no part whatever in the play, except that he has the right:
(a) To call the declarer’s attention to the fact that too many or too few cards have been played to a trick;
(b) to correct an improper claim of either adversary;
(c) to call attention to a trick erroneously taken by either side;
(d) to participate in the discussion of any disputed question of fact after it has arisen between the declarer and either adversary;
(e) to correct any erroneous score;
(f) to consult with and advise the declarer as to which penalty to exact for a revoke;