Going to give this another try this year. We tracked this for a little while last year under a thread by Canned Goods titled O/U system.
I'm looking at each individual teams O/U record for both home and away. A play is triggered when both teams have a 54% or better record for either the Over or Under. We chase for the series.
Last year I tracked this for the entire year (starting May 1) and the system went 208-13, with 3 of those losses only being 2 games (push on game 2 or 3).
2012 record 208-13 A: 118-103 B: 65-38 C: 24-11 D: 1-0
System chases +108.88 units
Overall: 208-152 (57.7%)
Note: I did not back test for prior years and the 2013 system is 16-1 so far. Will follow up this post with plays we can track starting on Friday.