On Saturday,

Almost every placegetter had ran 5th or better twice in past 4 starts.

Problem is so did half a dozen other horses each race.

The most successful numbers based on a couple of weeks of data were
1,2,4.
3 & 6 were next best.

Most had a place % of 40% or higher.

Quick system

1. 2 or more top 5 finishes in past 4 runs
2. No 1,2 or 4.
3. Place % of 40%+
4. Place div of $2+