I know this has been discussed many times, but here is another, clear and simple input: A) find a winning strategy (trend following is perfect here) B) invert all signals (go short when the system tells you to go long, and opposite) --> results are crap. So much for the random theory.
One nice thing about newbies is, they have a habit of making themselves clear. The "flip bad systems" concept is as realistic as the Loch Ness Monster. Seriously hoping you were joking, because this post was pitiful.