What do Aussies say when they meet someone in chess? Mate
chess puns

A chess instructor explains to a class of beginners the movements of pawns, rooks, knights, bishops, and queens. An observant student notices that one piece has not been mentioned and asks why the instructor hasn't discussed the king. He responds, "Because a king is not a subject".
This is based on a conversational exchange in the delightful 1990s French movie "Ridicule". Chess was not the topic in the movie, but the double meaning of "subject" carries over.
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