Don't want to get to much involved here as i have never,
Attempted this before but i will just say this.

A person from when i used to attend the track,
A fair while ago used to do this.

He went back several years and noted the winners,
And placegetters from all Listed, gr-3-2-1 races,
Over several years.

He noticed a trend where in "certain races" of this calibre,
These horses could successfully be followed for a certain nos of starts.

Some races he would only follow the winners,
Other races he would only follow the placegetters.

He would note the trainers of these horses age etc,
And would then put them into a stable.

He was back then very very successful.

Finding long priced horses that most of us would ignore.

One day at Flemington after he had knocked me off,
In a photo finish on a $26.0 pop i asked him how did you back that??.

Form was something like 0-8 and 3rd up his reply it ran 3rd,
In a gr-3 race last year and place getters from whatever race,
It was usually win within there next 5 starts.

Certain races only and group-listed from around Australia,
Winners or placegetters was how he gathered his stable.

Does this make sense???.