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PGN stands for Portable Game Notation. This is a file format for storing chess games (both the moves and various header data such as players' names) that is easily read by people while also easy for programs to parse.

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When and why was the notation changed from descriptive to algebraic?

Though the previous answers have made some solid points, I think they have not yet given the main reason why algebraic notation has generally come to be preferred over descriptive notation: it is more …
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