think gap as a big thrust bar or pluge bar. often I fade a big thrust bar or plunge bar.
80~90% time fade the opening in a gap up
80~90% time go with the gap down
that means: 80~90% time short a gap whether gap or gap down.
only 10% time you should jump on a gap up
only 10% time you should pick a bottom on a gap down
I traded lots of gap, you need some fundemental analysis to trade those gaps.
90% time if gap up/gap down, over 30~50%, buy whether gap up/ gap down.