Scottish football is relatively unique in the United Kingdom in that its top division splits into two sections towards the end of the season.
It is a peculiar method of concluding the league, but it has been used for nearly two decades and, despite occasional complaints over the years, that suggests it serves its purpose well.
So what exactly is the Scottish Premiership split and how does it affect clubs like Celtic and Rangers?
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Goal takes a look at the approach, when it was introduced and how it will work in 2018-19.