Additional annotations are available using Numeric Annotation Glyphs (NAG). Annotations are made using basic chess symbols. More detailed game pgn files contain annotations and comments. Additionally, pgn files may be simple game files with no annotations or comments. At the end is usually the result of the game (1-0, 0-1, 1/2 – 1/2) with a comment (signalling how the game ended e.g., Black checkmated, draw by agreement, Three-Move Repetititon draw, 50-move draw, stalemate). Next comes the game in a new paragraph utilizing the English Algebraic format. The headers included depend on what information is input by the creator of the pgn file. Not all pgn files contain the same headers. The file consists of a series of text/information “headers” within brackets with each header on its own line. Of course, there are game player/editor programs which also permit editing, annotating, and creating pgn files. They are editable with simple text-based editors such as Windows Notepad and WordPad. Files in pgn format are simple text-based files, configured for reading by and operation of computer programs. The Portable Game Notation (pgn) is a notation type utilized primarily for computer chess programs.
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