Rule 1: Operate on handicap races.
Rule 2: Last start <=21 days.
Rule 3: Do not bet on 2YO and 3YO horses running against older horses in all-age handicaps.
Rule 4: Eliminate horses who are having their first start at the course.
Rule 5: Eliminate horses who are having their first start in a handicap race.
Rule 6: Eliminate horses who are having their first start in a group or listed race.
Rule 7: Eliminate fillies and mares.
Rule 8: Must be trained by one of the top five trainers at the course.

This system has been adapted from a UK system. The trainer and jockey stats for the course can be found in Sportsman formguides.

Does it work.