The standard allows for other optional tag pairs. It is recorded as White score, dash, then Black score, or * (other, e.g., the game is ongoing). Player of the black pieces, same format as White.
Player of the white pieces, in Lastname, Firstname format. Playing round ordinal of the game within the event. Starting date of the game, in YYYY.MM.DD form. An example is New York City, NY USA.Īlthough not part of the specification, some online chess platforms will include a URL or website as the site value. This is in City, Region COUNTRY format, where COUNTRY is the three-letter International Olympic Committee code for the country. In export format, these tag pairs must appear before any other tag pairs and in this order: PGN data for archival storage is required to provide seven tag pairs – together known as the " Seven Tag Roster". There are no special control codes involving escape characters, or carriage returns, and linefeeds to separate the fields, and superfluous embedded spaces are usually skipped when parsing. A backslash inside a tag value is represented by two adjacent backslashes. A quote inside a tag value is represented by the backslash immediately followed by a quote. Tag pairs begin with an initial left bracket. PGN text begins with a set of "tag pairs" (a tag name and its value), followed by the "movetext" (chess moves with optional commentary). The export format representations generated by different programs on the same computer should be exactly equivalent, byte for byte. The export format is rather strict and describes data prepared under program control, similar to a pretty printed source program reformatted by a compiler.
The import format describes data that may have been prepared by hand, and is intentionally lax a program that can read PGN data should be able to handle the somewhat lax import format. There are two formats in the PGN specification, the "import" format and the "export" format. PGN is structured "for easy reading and writing by human users and for easy parsing and generation by computer programs." The chess moves themselves are given in algebraic chess notation using English initials for the pieces. Edwards, and was first popularized and specified via the Usenet newsgroup.
PGN was devised around 1993, by Steven J.
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