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Message: [QUOTE="upperdeck, post: 4557212, member: 474"] There are a ton of systems that work well for 2-3 yrs and then blow up. Many of the model guys try to tweak systems and then fail miserably. I follow alot of people on sites who had great 100+ unit yrs and now since covid have given it all back. One of the hardest things to do is to retro test a model. the years of things just grinding out winnings like it did 20 yrs ago seems to be gone. [/QUOTE]