A gap up or gap down open is an emotional move, and it often will reverse course and turn in to "trap open". Gaps that are less than 4 points on the SP Future tend to get filled in the same day, especially Tuesday through Thursday. Turns will occur within 20 to 40 minutes after the open. A trader must be on the lookout for a reversal as soon as early momentum is lost.

A gap into a good support /resistance zone is almost always a good "fade" - with stops no more than 1 point on other side of the support /resistance zone. (A "fade" is simply entering a position opposite of the direction of the gap. If the market gapped down, a "fade" would be entering a long position (buying) in to the selloff.)
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