for example, I look at charts, and found and back tested, if price move up and down too much , statistically speaking, there is high prob. of pull back. this is my edge. however there is not much such trading opportunity, maybe only once a week. some people do trend following, some trade on breaks , those are common strategies.when too many people do those kind of strategies, it will not make money easily. any other type of strategies that are not so obvious?