This system, located at http://forums.ozmium.com.au/showthread.php?t=862, was created by Numerator on 31/5/2002. The rules are as follows:

Rule 1: Operate on Melbourne, Sydney and Brisbane meetings.
Rule 2: Only look at TAB numbers 5, 6, 7 and 8 after morning scratchings.
Rule 3a: The BACKER UPPERS selection is any of these horses whose latest race was 5, 6, 7 or 8 days ago. It must be the only BACKER UPPERS qualifier amongst those numbers in the race.
Rule 3b: The HI STRIKERS selection is any of the horses whose win/place percentage for all its starts is 56.78 percent or more from at least 5 life starts. It must be the only HI STRIKERS qualifier amongst those numbers in the race.
Rule 3c: Any final selections from the above 2 systems that are qualify for both BACKER UPPERS and HI STRIKERS qualify as STUNNERS and are backed for triple the normal bet.