p.boxed
  | You can control enemy pieces which are attacked.

p.
  Rather than moving one of his own pieces, a player may elect to move any
  enemy piece that is attacked. The move must be a legal move for the enemy
  piece, except that the (hypnotized) piece now captures its friends.

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

figure.diagram-container
  .diagram.diag12
    | fen:r1bqk1nr/pppp1ppp/2n5/1Bb1p3/4P3/5N2/PPPP1PPP/RNBQK2R:
  .diagram.diag22
    | fen:r1bnk1nr/pppp1ppp/8/1Bb1p3/4P3/5N2/PPPP1PPP/RNBQK2R:
  figcaption Before and after Nxd8 (controlled by bishop on b5).

h3 Source

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

p Inventor: W. D. Troyka (2003)