I devised a system several years ago, one of my better ones so I thought. It consisted of betting on the fifth favourite for every horse race of 17 runners or less. I paper traded so I didn't do it for real and started betting 2% of my bank for each race. My starting bank was £100.

Within three months I had accumulated 18k but from experience I decided not to bet for real and carry on paper trading. Wise decision. Within a few months the bank was depleted, down to under a grand, and at that point I gave up with the system.