91.60 is a minor reversal on that chart...since moving up it has generated new lines. You have to think of each line as being a reversal...if it closes above a green line then it will travel to the next green line where you would expect another reversal.

Here's an updated chart. 80.60 is our next line to get over to keep the rally going. Your major targets would be 88.30 and 92.50. If price can't clear a line it will reverse and test the next opposite line.

I'm still long corn...major target is 762.50, I may exit there, it will depend on how the red lines move up as well. It doesn't mean that it will be a top by hitting a target...It is just where a reversal is likely, you can always exit just below the line and re-enter the trade if it closes above the line I'll post a corn chart later today.