How about...

1. Eliminate Pre-Post Favourite (Newspaper Guide Favourite)
2. Eliminate 100 rater (if next raters are 99,98,97).
3. Eliminated newspaper pro first selection.
3. Select a horse within the top 4 raters except the 100 (so one of the next best 3 to win).
4. Eliminate races with 7 or less runners.
5. Eliminated maiden races.