System developers are obsessive about markets and their historic performance. Their constant chart scrutiny all but ensures a bottomless well of inspiration. That's how the author recently found himself re-visiting a frequent obsession: if and how the September-October stock market telegraphs its traditional downside trajectory ahead of time. Overall, September is a far more negative month, despite October's legendary crashes. Those melts should make further investigation worth the effort, despite the non-dramatic initial findings. "Plan B" illustrates a cup bottom formation. A cup is a three day formation in which the second, or middle day, has the lowest low. The formation is most noteworthy when it is reversing a multi-day trend. It visually depicts a convex bottom, the same way the bearish "cap" counterpart suggests topping (middle day is the highest high). For years, the author's analysis has shown a wide application of cup/cap biases.