Many years ago the old Sportsman used to have pages and pages of system sellers flogging their wares.
Here,s a couple more that I just dug up.

1/use any Daily newspapers odds column

pick the shortest priced horse on the 8 race programme

Bet that horse only

Method 2

FAV

ON BOTTOM WEIGHT OR WITHIN 1/2 KG of BOTTOM WT

MUST HAVE WON LAST START

I think the only one I didnt get hold of was the PATERINA(or ) PATRINA system.Always wondered about that one.

Cheers
Darky