As old as time itself, these peaking programs can be run for squat, bench, and deadlift when preparing for a powerlifting meet. Both seek to improve your 1 rep max by 5% after the end of the cycle.
The differences between the 9 week and 12 week peaking cycles can be seen below:
9 Week Powerlifting Peaking Program
12 Week Powerlifting Peaking Program
9 and 12 Week Powerlifting Peaking Spreadsheets