What is the right way? :S

Uploaded 23 Jul 2009 by o0RebelZ0o.

Map details

Track id
1560724
Type
Race
Difficulty
Advanced
Author time
0:42.460
Awards
0
Author time beatable
Yes
Tags
Race

Freed by

First replay on the map
Stood unbeaten
5,671 days (15.5 years)
Recorded by
backfill scan
Age of the record
19 mo ago

Score breakdown

base 10 points
13ELO for freeing this map
Factor×How it was derived
Style1.00Race 1.00
Difficulty1.30Advanced
Length0.97sqrt(0:42.460 / 45s)
Bonus1.00No bonus applies

10 × 1.00 × 1.30 × 0.97 × 1.00 = 12.63, rounded to 13. Why these factors.