With 110 matches to feature two coaches appointed this year, tactical history is becoming harder to ignore in a league of rapid turnover New managers are facing an almost one-in-two chance of being fired before the end of the season, a finding from Guardian analysis that shows 22 of the last 50 permanent Premier League managers to leave their roles lasted less than a year. The betting markets reflect this reality. Six of the eight Premier League managers deemed most likely by bookmakers to be n…