“Pigeon chess” is a figure of speech & an Internet lexicon, referring to debates with science deniers like flat-Earthers. They are ignorant of the subject matter but standing on a dogmatic position that cannot be moved with any amount of education or logic but who always proclaims victory.
The term originates from an Amazon.com book review: “Debating creationists on the topic of evolution is rather like trying to play chess with a pigeon; it knocks the pieces over, craps on the board, and flies back to its flock to claim victory.”
- Pigeon chess – RationalWiki
- Pigeon chess – Urban Dictionary