p.boxed
  | Pieces attacked by the Mesmerist can be controlled.

p.
  A new piece — the Mesmerist — has the power of mind control,
  and may elect to move any enemy piece which he observes.
  The Mesmerist moves like an orthodox queen, but cannot capture (except
  through mind control). His victim is said to be mesmerized.

p The Mesmerist is represented by an upside-down queen for now.

figure.diagram-container
  .diagram
    | fen:rnbqkbnr/pppppppp/3m4/8/8/3M4/PPPPPPPP/RNBQKBNR:
  figcaption Deterministic initial position.

p.
  The mesmerized piece is temporarily frozen and thus cannot be moved by its
  owner on the next turn.

p The game is won by capturing the enemy King or Mesmerist.

h3 Source

p
  | Mesmer Chess on 
  a(href="https://www.chessvariants.com/mvopponent.dir/mesmer-chess.html")
    | chessvariants.com
  | .

p Inventor: W. D. Troyka (2003)