Here is a system that I found on the Internet which I have adapted to Australian conditions.

Rule 1: Operate on non-handicap races except for maidens.
Rule 2: Consider only the pre-post favourtite.
Rule 3: The contender must have raced within the last ten days (inclusive).
Rule 4: The race must have ten or less runners.

SELECTIONS

12/2/2005

No qualifiers.

19/2/2005

Warwick Farm
Race 6: Grand Armee FIRST $1.80/1.40 ($1.90 at 1/3 odds)

Moonee Valley
Race 3: Opportunity FIRST $1.60/$1.10 ($1.65 at 1/4 odds)

26/2/2005

No qualifiers.

3/5/2005

Caulfield
Race 3: Ballet Society FIRST $3.10/$1.40 ($3.40 at 1/4 odds)

RESULTS
Selections: 3
Wins: 3 (100.00%)
Places (including wins): 3 (100.00%)
Win return: $6.50 (SuperTAB); $6.95 (SP)
Place return: $3.90 (SuperTAB); $4.06 (SP)
Number of runners: 26 (11.54%)
Number of winners: 3 (100.00%)
Relative frequency factor: 8.6667
Expected number of winners: 1.4550
Actual-to-expected ratio: 2.0619