Do a search before posting and tell us something new, sbrass.
CB
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I've done a test by strategy tester, to print every ticks of a day and I've discovered that at the same second the bid value is the same (for multiple running of this test) but the ask value is different!!
For one running spread value is immutable for all the day (or for the period you want to test) and the ask value is calculated by using the spread at the moment of the test start.
There is a big problem, because all the back test will not be reliable!!