I started reading the quarters theory book and I can see the author uses in his examples a line chart (most likely a line on close). When I was reading about the overshoots and undershoots, he said that he considers valid a close, a high or low on those 25pip areas. Ok. Thing is you can have price overshooting a major level by more than 25 pips (which he would consider a valid break), then having the price coming back and closing on the low (upthrust). So on a bar chart you would have an overshoot of more than 25 pips (which then ceases to be an overshoot and turns into a valid break), and on the line on close chart you would have an undershoot.
So you see how this can give conflicting info.
Just would like to know your thoughts about that, cheers!