I have been receiving a number of requests wanting to know how I determine when doubles will hit. There is a thread about doubles indicators, but I am going to post what I use as indicators here in my Blog for easier reference.
Of course, I am not always right about doubles, but very often I am. I do not know which doubles will fall, but my indicators seem to work well in predicting when doubles will happen.
First of all, you need to know what I mean when I say "rare numbers". Those are the pure even (024, 026, etc.), pure odd (135, 137, etc.) and the series (012, 123, 234, 345, 456, 567, 678, 789, 890, 901). For the purposes of doubles indicators I do not count the pure doubles like 113, 228, etc.
The first thing I do when I analyze a draw is see if the last number (I always use mid to mid and eve to eve) drawn was a rare number. If it was, I look to see if there were 3 or more rare numbers in a row (again, don't count doubles). If there were 3 or more in a row, then I play all triples. Seems like trips follow unusual draws! If no 3 in a row, then I play doubles. Again, I don't know which ones!
Another very good doubles indicator is when the last draw contains a zero and the other two digits are odd (if they were both even, that would be a rare and doubles would be indicated anyway). An example would be 103.
I think that covers doubles indicators.