What’s the difference between open intermediate and advanced intermediate?

Open intermediate has all phases run at Intermediate level, but open to horses graded Advanced.

Advanced intermediate has advanced level dressage and show jumping, with intermediate cross country.
 
AI has 1.30m sjing and advanced dressage test but intermediate xc. OI is for horses out of intermediate points but run round standard intermediate so 1.20 sjing.
 
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