I'm not sure what btn and ovr_btn are short for?
The value of the ‘btn’ field refers to the distance in lengths that a horse finished behind the horse that placed in front of it.
The value of ‘ovr_btn’ is the distance in lengths that the horse finished behind the winner of the race.
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The value of the ‘btn’ field refers to the distance in lengths that a horse finished behind the horse that placed in front of it.
The value of ‘ovr_btn’ is the distance in lengths that the horse finished behind the winner of the race.