32. If a player corrects his mistake in time to save a revoke, the card played in error is exposed; but any cards subsequently played by others may be taken back without penalty.
33. PLAYING ALONE. No one but the individual maker of the trump can play alone.
34. The dealer must announce his intention to play alone by passing his discard over to his partner. Any other player intending to play alone must use the expression “alone” in connection with his ordering up or making the trump; as, “I order it, alone;” or “I make it hearts, alone.”
35. The partner of a player who has announced to play alone must lay his cards on the table, face down. Should he expose any of his cards, the adversaries may prevent the lone hand, and compel him to play with his partner, the exposed card being left on the table and liable to be called.
36. The lone player is not liable to any penalty for exposed cards, nor for a lead out of turn.
37. Should either adversary lead or play out of turn, the lone player may abandon the hand, and score the points.
38. MISCELLANEOUS. No player is allowed to see any trick that has once been turned and quitted, under penalty of having a suit called from him or his partner.
39. Any player may ask the others to indicate the cards played by them to the current trick.
40. A player calling attention in any manner to the trick or to the score, may be called upon to play his highest or lowest of the suit led; or to trump or not to trump the trick during the play of which the remark was made.