Quote from R. Raskolnikov:
Most being what %? Also, how FAR does it go, how much do you give it against you etc etc etc.
The point I was trying to make, in a joking way, was that books can give you concepts or ideas but the practice of trading is one that can ONLY be gained fully by trading the market oneself. Unless you have definite criteria to answer these questions about fading gaps, you'll most likely find yourself lost in that trade. A fade retrace can be 1 pt, 6 pts, 2 ticks an entire gap fill and the list goes on and on.
Does your book handle all these in order to actually profit or minimize damage in case the book is wrong?