Sorry for the late reply. I don't sign on very often any more. I knew George and the systems he used quite well. He was able to generate a steady income on a monthly basis from racing. Note I said monthly NOT daily.
His basic premise was that each horse at a certain odds range would have a certain % wins. For example a horse going of at 5 to 1 odds horse would win on average 11% of the time. This would apply to all odds ranges. Knowing this he could figure out the standard deviation or longest possible loosing streak in advance for each horse odds. In addition he used a due betting system of so much per race depending on his available capital.
In his PRN articles he would bet the horse going off at 5-1 odds with a due column. He also had systems to bet the favorites and second favorites for recovery purposes when his due got very large. Another system he had when his due got large was to spread his bets on a number of other horses to help recover the due and make a profit. The recovery methods were never published in PRN.
I saw him make a steady income for a number of years and I used some of his systems to make a living myself for a while till I moved on to Sartin and PIRCO.
If anyone is interested and since I have used, and am familiar with his systems, I am willing to do some writeups of some of them for a small fee to cover my time and expenses.