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The standard handicap seeds the rolling handicap for boats that have not raced before.
The rolling handicap from before the race is used to compute corrected times.
We use elapsed times to calculate handicaps for subsequent races.
For a race, the imputed handicap would make all boats with meaningful
elapsed times correct out as being tied and
the geometric mean of all such imputed handicaps will be equal to
the geometric mean of all the standard handicaps for the same boats.

The scoring system remembers seven previous imputed ratings.
After the race the eighth oldest imputed ratings is forgotten and
the newest remembered for up to seven subsequent races.
The rolling handicap after the race uses this new list of imputed ratings.
It does so by sorting the imputed ratings, throwing out the two extremes
then taking the geometric mean of the middle five.
See the 2022 Handicapping Synopsis
document for details of how initial ratings are determined.