Most know of the system which uses one up/one down from previous draws to come up with subsequent draws. In addition to the one up/down a second set of numbers can be derived using the 023 formula (123 becomes 146) and so on.
By accident I came across a way to determine when doubles will occur. This system was back tested in NJ only so I'm not sure if it works in other states. Anyway, what I did was I backtested by looking for doubles (any doubles at this point). I worked back 2-3 draws to see if there were any triggers for the doubles. What I came up with was a series of numbers that was present before doubles fell which utilizes the 023 system. Here are the trigger numbers:
Now X is any number. You'll see that in the case of the, i.e., 20X, by using the 023 rule, the number now becomes 22X. From that point on all doubles are formed with the one up/one down system. The same holds true with, i.e., X09. By using the 023 rule, the number now becomes X22. From that point on all doubles are formed with the one up/ one down system. I should point out that the doubles that were generated from the one up/ one down were rarely the ones that fell, however, but if you like to play your favorite doubles, this may be a trigger to look for.
Hoep this makes sense. It appears to work quite reproducibly in NJ. There were only a few times where it didn't work. Try it in your state to see if it works. I'll be keeping track of NJ to see if it keeps up. 425 fell midday, so I'm hoping to see doubles over the next few draws (448, 559, 660, etc.)
I'd be interested to know if anyone has anything to add to refine this system.