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Numeric Annotation Glyphs
Numeric Annotation Glyphs or NAGs are used to annotate chess games when using a computer, typically providing an assessment of a chess move or a chess position. NAGs exist to indicate a simple annotation in a language independent manner.
NAGs were first formally documented in 1994 by Steven J. Edwards in his Portable Game Notation Specification and Implementation Guide. Within the PGN specification, 256 NAGs are proposed of which the first 140 are defined; the remainder were reserved for future definition.
==Introduction==
A Numeric Annotation Glyph is composed of a dollar sign character ("$") immediately followed by one or more digit characters. Each NAG then has a specific meaning and often a standard typographical representation. The meanings first defined stemmed from the use of specific typographic symbols when annotators were commenting upon chess games; most especially in Chess Informant publications. The objective was to devise an alternative representation of these symbols which could be incorporated in the simple computer file format proposed as the PGN standard. This mechanism allowed often sophisticated typography to be expressed using the simple ASCII character set.
Since its inception there has been no attempt to further formalize or standardize the meaning of the undefined 116 NAGs
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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