This is where the "accredited investor" warnings are appropriate. Don't do this with your money if you aren't willing and able to lose it!

In the long run, it's impossible for people to beat the market simply by looking at historic stock prices. Impossible. If it is possible in the short run, more and more people will do it until they don't make any money at all, or a "black swan" event occurs and they go completely bankrupt. (I suppose there's a third option, that they all make so much money that the entire rest of the world goes bankrupt, but that's absurd)

So be careful!