I have an Associates in Quality Control, spent many years as a SPC Technician...that's Statistical process Control.
I went from running machines to being a quality control inspector, was my job to gauge the parts coming off the machine to look for variations, make sure everything were running to the blueprint specs.blah blah blah, really boring.
But, that's where I learned the Bell Curve and applied it to the 3 digit, in random number distribution, you get what's called a bell curve.
I don't want to make this long and drawn out, but basically I look for whats missing, what's most likely, what's due.
I have no secret formula, no tic tac toes, don't flip, don't add, no pyramids.
I will try all the sytems posted here, cause ya just never know, some work , some only work once in awhile.
I always go back to my CHARTS.
Paper and pencil , lots of paper
I have several tools here that are the most valuable, the inspect 3, search past results, the prediction board to gauge my progress.
I track sums, I track pairs, I track the movement of the position of the numbers.
I also use the vtracs, this helps with putting pairs together, example,
Let's say, pair 54 is due, and I need sums 13 and 16. well I would play 544 and 547, I go and look at my vtrac chart to see if the vtracs for these numbers are due, hot, etc, and I look to see past data, it helps me to decide how I want to play the number, maybe 475, or 754, many times I play just one number, straight for a buck and boxed for a buck.
Tracking the numbers is something you want to do, if your not willing to put the time in keeping track, no system is going to help.
Using the tools here and improving my skills have got me some good wins.