Primary count is Minute [iv] of Minor 1 is tracing out. It could take the form of a zizag, flat, triangle of some other complex combination. No matter what the form, at some point a wave four has a max price retrace point. This often occurs on the (a) wave of a wave four (for instance a contracting triangle the (a) wave is the peak price of the correction in the case of a bear wave).
So no matter the form we are looking for a max price peak.
The "control" of the wave count is iv of (iii) of [iii]. A move above this - 1215 SPX - can indicate something else than a wave [iv] may be occurring.