Hi Ray,
My thoughts -- Altho it's generally a pretty good strategy to start chasing after a couple of losses, I don't think this particular case would be beneficial.
Reason being, is this System has not experienced a loss since I've starting following at the start of last season. I think the Units you would be missing out on in Games 1 & 2 would make this non-productive.
Stats from last year -- you would have missed out on 56 Game 1 & 2 wins, and only won 17 on Games 3, 4 & 5.
This year -- not as extreme yet, but it's still only May.. you would have missed out on 12 Game 1 & 2 wins, and won 8 on Games 3, 4 & 5.
Also, you mentioned chasing to 5, meaning your overall theory is that there will not be a loss in 7 straight games (games 1 & 2 skipped, plus the next 5 you chase). Well, the RunLine Blitz is a 6-Game chase, so, for all the Units you're missing out on, it's only 1 extra game that you're giving yourself a chance to win on.
If your goal is to just pick up a few extra Units, without any deep risk, then by all means I think this is a good idea. If you're thinking of playing this with a couple of Systems, it definitely could add to your bottom line - just not as a stand-alone System by itself.
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I think there was a lengthy thread last season doing the O/U 5 game Chase. Can't remember the exact results but I don't recall it being profitable. Maybe on the Labourchere, but certainly not the Martingale. It was similar to the TonyAllDay one which Gameboy is carrying on this year, meaning it must be played on a Labourchere.
Anyway, if you look back into last summer's threads you will probably come across it.
Good Luck with whatever route you decide.
Cheers