This tool will compare the first race against the second race. It uses common racers between the races to come up with a conversion between the races.
Optionally enter the first and last name of a racer who did the first race and the tool will predict their finish time of the second race. This can be used to either predict a time for a race that wasn't skied or it could be used to determine which performance was "better".
The final parameter is the percent back limit. This optional parameter will limit the tool to comparing common racers who were within the specified perecent back of the winner. The general idea is that the closer to the pointy end of the race the more consistent the results.