I. Every card faced upon the table otherwise than in the regular course of play.
II. Two or more cards played to a trick. The adversaries may elect which shall be played.
III. Any card named by the player holding it.
25. If an adversary of a person playing alone exposes a card, the lone player may abandon the hand, and score the points. Should the partner of the lone player expose a card, the adversaries may prevent the lone hand by compelling the player in error to play with his partner, leaving the exposed card on the table.
26. CALLING EXPOSED CARDS. The adversary on the right of an exposed card must call it before he plays himself. If it will be the turn of the player holding the exposed card to lead for the next trick, the card, if wanted, must be called before the current trick is turned and quitted. Should a player having an exposed card and the lead, play from his hand before the previous trick is turned and quitted, the card so led may also be claimed as exposed.
27. LEADING AND PLAYING OUT OF TURN. If a player leads when it was his partner’s turn, a suit may be called from his partner. The demand must be made by the last player to the trick in which the suit is called. If it was the turn of neither to lead, the card played in error is exposed. If all have played to the false lead, the error cannot be rectified. If all have not followed, the cards erroneously played must be taken back, but are not liable to be called.
28. If an adversary of a lone player leads out of turn, the lone player may abandon the hand, and score the points.
29. If the third hand plays before the second, the fourth hand may play before his partner, either of his own volition, or at the direction of the second hand, who may say: “Play, partner.” If the fourth hand plays before the second, the third hand may call upon the second hand to play his highest or lowest of the suit led, or to trump or not to trump the trick.
30. REVOKING. A revoke is a renounce in error, not corrected in time; or non-compliance with a performable penalty. If a revoke is claimed and proved, the hand in which it occurs is immediately abandoned. The adversaries of the revoking player then have the option of adding two points to their own score, or deducting two points from his score. If both sides revoke, the deal is void. If one person is playing alone, the penalty for a revoke is as many points as would have been scored if the lone hand had succeeded.
31. A revoke may be corrected by the player making it before the trick in which it occurs has been turned and quitted, unless the revoking player or his partner, whether in his right turn or otherwise, has led or played to the following trick.