The Bishop and Knight, in contradistinction to the Queen and Rook, are called Minor Pieces.
Howard StauntonA player is said to have the opposition when he can place his King directly in front of the adverse King, with only one square between them. This is often an important advantage in ending games.
Howard StauntonWhen a Piece or Pawn is in a situation to be taken by the enemy, it is said to be en prise. To put a piece en prise, is to play it so that it may be captured.
Howard Staunton