This is a very good article dear friend. Your explanations of what blockchain oracle is seem to be very simple and understanding. With the help of the example you stated. That’s the car racing the two individuals were playing. You made it clear that in order for the blockchain to be able to know the winner in order to award them. The blockchain oracle must take data off-chain that from outside world to know how much each placed and the total amount of money there. Also it has to know who to give the money to after they are done playing and there is a winner. Indeed this is a very understandable example. Good luck buddy