This is a system i have worked with for the past few years that has turned in some great reseults!
RULES:
1. Same/Dropping in class
2. TAB no. 1-6
3. Barrier 1-6
4. One of the Top 4 backed runners (ignore races with odds-on favs)
5. 1st of 2nd in at least one of last two starts
6. Fitness Pattern one of the top 3 for the distance* (see below)
7. Race must be 1800m or below

PLAYABLE RACES:
-Fixed weight open 2YO
-Fixed weight open 3YO
-Class 6 or better up to 1600m
-Welters
-Open Hcps
-Qualitys

NON-PLAYABLE RACES
-Hurdles/Steeples
-Maidens
-2YO Hcps
-Mares
-Class 1-5
-3YO fillies
-WFA

*This is if you have access to statistics regarding Fitness patterns

Look at the results before you knock the system!

Chuck