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Could you explain why knowing yesterdays high would prevent taking a long position of the range BO.
Well, "prevent" is a strong word. "Discourage" is more like it. Given that there was potential resistance (something that everybody could see) just above that range and nothing below it, I had no interest in going long. I didn't really think about it. I just wasn't interested. One could, of course, if he was prepared to exit or raise his stop when price stalled at R. I just didn't think it was likely.
What I would suggest to a beginner is to go ahead and take the long but keep a tight stop, for if it doesn't go right away it probably won't go at all. Then wait for price to pass back through that range and take the short. If that doesn't work either, then stop. As near as we were to the median, tho, I expected more, and we got it.
Of course, one must be able to recognize a range, something which so few at ET are able to do (when a self-proclaimed "experienced trader" says he can't recognize a range much less know how to trade a breakout from it, I have to wonder just how much experience this trader has).