Rules:

1: Must be 56kgs or above
2: Must be barrier 1-6
3: Must have placed 1-3 at last start
4: Must be racing within 21 days of last start
5: Must be field of 8-12
6: Must be sole selection in race

Have run it over a few random days manually and seems to do alright, but would be interested in some long term data.

Cheers