Bad news gap system

[Perthuis <Perthuis@xxxxxxx>]

I am looking for a system or show me that finds the following:  If open <
close of one bar ago by variable % then buy open and sell close.

I see that stocks that gap down on open on bad news usually close up
substantially.  Does anyone have a system or show-me that uses this idea?  I
have tried to write this but am new to easy language.  Before I get too
frustrated I thought I would try here.

Thanks

Pert