It doesn't matter how well defined a #ChartPattern is..

It could still fail to materialize. Everything is possible when trading, including patterns than never confirm (breakout or breakdown) and patterns that fail before they are completed. REYN is a good example. This was one of my top watch list stock. i posted about the double pattern developing inside of each other few days back(chart below). Earnings came out today and had something else in mind. The stock could still drop into a trading range transforming current chart pattern into a rectangle chart pattern. But for now, current inverse head and shoulder and ascending triangle patterns are both broken.