CHAPTER V
THE AUCTION 

PART II
IRREGULARITIES IN PROCEDURE

SECTION TWO
CHANGES OF CALLS

LAW 26 - CALL WITHDRAWN, LEAD PENALTIES 

When an offending player's call is withdrawn, and he chooses a different  final call for that turn, then if he becomes a defender:

A. Call Related to Specific Suit

If the withdrawn call related to a specified suit or suits, and,

1. Suit Specified

If that suit was specified by the same player, there is no lead penalty, but see Law 16C.

2. Suit Not Specified

If that suit was not specified in the legal auction by the same player, then declarer may (penalty) either require the offender's partner to lead the specified suit (or one particular specified suit) at his first turn to lead, including the opening lead; or prohibit offender's partner from leading the specified suit (or one particular specified suit) at his first turn to lead, including the opening lead, such prohibition to continue for as long as offender's partner retains the lead.

B. Other Withdrawn Calls

For other withdrawn calls, (penalty) declarer may prohibit offender's partner from leading any one suit  at his first turn to lead, including the opening lead, such prohibition to continue for as long as offender's partner retains the lead.

Declarer specifies the suit when offender's partner first has the lead.