pearcy,

Try the following :

1.Unitab rating =100
2. Outside 2 barriers
3. Last Start Winner
4. 8 or more runners in the field

It produces a small profit ($799.90 from 784 bets)

You can improve it heaps ...

For example ...
5. Winners which won by less than 2 lengths has $397.30 from 337 bets

The reasons you might use these factors are :

1. Unitab ratings of 100 are 2.4 more times likely to win
2. Outside 2 barrier give you some decent odds
3. Last start winners are showing form and fitness and are 40% more likely to win than the average horse.
4. Larger fields give better odds
5. We pick winners which had a hard win last start (less than 2 lengths). Those that win by too much are usually very low odds next race.

Good Luck