I entered a 500-word flash fiction contest last month and was named one of their top entries. (They don't award 1st, 2nd, or 3rd, but identified their top six stories and mine was one of them.) My story is the fifth from the top. Note that they give you specific rules for some things that have to be included in the story:
https://www.writerscentre.com.au/blo...tory-showcase/