Chesslurk

The Chesslurk: "A being similar to the Mirelurks, except that it plays chess. Not to be confused with Chessturk"

Lurking: "To exist unobserved or unsuspected"

Chess: "A board game of strategic skill for two players, played on a chequered board on which each playing piece is moved according to precise rules. The object is to put the opponent's king under a direct attack from which escape is impossible"