Pizza can probably best answer as he's older shhh but I believe if I remember correctly the number was based on lets say aqueduct. Race 1 2 and 3 where the daily number. So if the 1 horse won then 3 won the second race and then 7 won the third race the daily number would be 1 3 7

Or some modification of that.

I think...... whistle


When Interpol?