What is a steward’s enquiry?

A Stewards Enquiry (most frequently applied in horse racing) is a review system that takes place after a race to ensure the race has been run fairly and race-rules have not been broken. 

It is most common when horses interfere with one another, compromising the chances of a particular horse. If it is subsequently decided that a horse or jockey’s actions have prevented another horse from winning and there is a clear rule violation, then placings can be reversed, or a horse can be “thrown out” of the race.