Trendline support became resistance yesterday in the blink of an eye, as the futures experienced an unaccustomed setback — their worst point decline in two months.  There were no ready explanations for the weakness, although some commentators ascribed it to disappointing economic data that as recently as Friday would not have given bulls a moment’s pause. The move was impulsive on the daily chart (see inset), suggesting that we’ll need to take it seriously from the get-go. However, because there are no compelling Hidden Pivot targets that we can use at the moment, we’ll need to keep a Fibonacci-based support at 913.25 in mind as a minimum downside objective for now. Check back Tuesday if it fails to hold, though, since it may be possible by then to gauge the strength of the selloff using Hidden Pivots. _______ UPDATE:  The intraday low at 910.75 hit a “reverse Hidden Pivot” to the exact tick. The number is derived from an ABCD variant that uses k-A-B as the three coordinates thus (on the 60m chart): k=923.50 (May 20); A=876.75 (May 26); and B=957.50 (June 5). Plug those numbers into your calculator, respectively, as A, B, and C and you’ll get your D target at 910.75. Generally speaking, such patterns are not as reliable as the standard ABC patterns we use, but that is not to say they couldn’t become more useful with the application of a few rules that diligent observation over a period of weeks or months might yield.