  Purpose: In powerlifting the total result is highly dependent on the athletes
bodyweight. Powerlifting is divided to equipped and RAW types. Pro RAW
powerlifting competitions use the Wilks scoring system to compare and rank
powerlifting results across bodyweights, to choose the winners. The Wilks
formulas are 5th order polynomials fitted to equipped powerlifting results from
the years 1987 - 1994. The Wilks formulas were meant to be updated every 2 to 5
years, but have never been revised. This study aims to update the Wilks scoring
system for use in pro RAW powerlifting.
  Methods: The 10 highest RAW powerlifting totals per weight class for
bodyweights 60 - 175 kg for men, and 44 kg and up for women, were collected
from the openpowerlifting.org database. Polynomials were fitted to these data
separately for men and women, using polynomial regression. The scores for men
and women were calculated using these fits, and the results are assessed.
  Results: 4th order polynomials were chosen for best describing the dependence
of powerlifting total result on bodyweight. The mens scores were normalized to
500 points, and womens to 455 points, on those fitted curves, to bring the top
scores to the same level across weight classes of each sex. These scores
appeared similar across the different weight classes for both men and women.
This even scoring across body weights is here considered the single most
important characteristic of a scoring system for pro competitions.
  Key words: Wilks score, revised prediction curve, polynomial regression,
powerlifting
