Originally Posted by paijolopez

another smart question from smart person

the answer is simple, it's all about deviation of pair movement, I have research (since august 2006) they always move between 20 and 25 pip above and bellow pivot for good entry point, so the best position to pick the entry was 22,5 or between 20 and 25, in this case I pick 22 for range. You can read the story behind daily20pip for similiar explanation, that's trully the first ancient idea before it become forex signal generator project
please remember I do this project based on GBP/USD, so you have to try your own set with other pair, hope this help