Well, EU prevents this kind of workaround by restricting stays to 90 days within 180 days period, so leaving EU for a couple of days after a stay of 90 days and

Well, EU prevents this kind of workaround by restricting stays to 90 days within 180 days period, so leaving EU for a couple of days after a stay of 90 days and coming back to stay another 90 days won't work, you will go over your quota.