Full list of systems and how a horse qualifies for a system, examples below
System Number 2 says "Combined Top Three Horse Number 2 sp =< 100/1" this means it comes from our combined ratings and was the second top rated and its starting price was less or equal to 100/1
System Number 688 says "Horse Bottom Three Horse Number 3 sp =< 100/1 and Jockey Bottom Three Horse Number 1" this means the horse was rated 3rd from bottom and had an sp of 100/1 or less and the jockey was bottom rated.

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System Names
 
Full list of systems with descriptions