Quote from Laissez Faire:
That's the definition of a gap (the close price).
But I've observed that many times that price is not reached a by a few ticks. One could argue that the gap is closed when it's that close though.
For those who watch SPY, maybe that gap was closed?
LF,
I don't see an ES gap...that gap closed later that evening...(Oct 1st.)
SPY gap (Sept 26th) closed at 169.65 this am, to the penny.