I think it only works as a DD
Maybe that changes if you go back further
Maybe the system is .500 if you go back far enough
But the league and rules change
There is never a guarantee a system will continue
I like systems
But I combine systems with my personal capping to decide if it seems like a good play or vary how much the play should be based on the system and capping
I would suggest people do the same
Great points! I've seen a system go for years and years with a great record only to turn around. I think I'll try to dig it up and will post here later. That's one of the biggest tricks of finding these systems. It's great that it's worked for so long but it can turn at any moment. That's why it's good to tweak it every now and then.
Using "-6 >= line" gives us a record of 8-7 for the last 15 games if you count the Packers (which the database does) even though they eventually went down to -5.
Here is the syntax for double digit. I left out -10 itself since we can see that Biz's table shows a 4-3 record for exactly a line of -10.
-10 > line and n:rest > 9 and season > 2000 and not A and REG
This results in a record of 32-10-1 (76.2%). The record for this system is 27-3-1 (90.0%) since December 2008 and only usually results in about 3 plays per year.