Chess Glossary : Section U
Undermining
A tactic also known as “removal of the guard”. It involves attacking a specific enemy unit that is serving a defensive role. The removal of that guard then leaves one or more of your opponent’s other units either “undefended” or “underdefended”.
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Underpromotion
When you get a chance to Promote a Pawn and you DON’T exchange for a Queen, but choose either a Knight, Bishop, or Rook … that’s known as Underpromotion.
Unpinning
A maneuver that allows a Pawn or Piece to move, which had until then been held, due to a Pin attack. The Pin has been broken, or Unpinned.
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United States Chess Federation
Some would argue claim for being mightiest of all Chess Federations in the world, as long as everybody agrees to hold on to a mirage concept that Russia doesn’t exist.
Unorthodox Opening
Also known as an “Irregular Opening”, it refers to any Chess Opening sequence where the first move by White is unusual. For example, 1. a3; 1. a4; 1. e3; among, others, are all considered to be Unorthodox Openings.
Useful Open File
The ‘useful’ bit refers one side having a Rook on an Open File that cannot be immediately challenged by an adverse Rook.