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Adverse Piece. A Piece of the opposite color.

Attack. This term may be explained, in several different ways: (1) Any force commanding a square occupied by an adverse force is said to attack the latter, though attack may exist without power to capture. (2) A combined movement of two or more Pieces tending to compel the adversary to abandon some particular force or position. (3) A combination against the King or his position. (4) The player opening the game (generally the White), makes the attack. (5) A strategic move directed against a weak part of the enemy's force.