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HistoryPGN was devised around 1993, by Steven J. Edwards, and was first popularized via the Usenet newsgroup rec.games.chess.[1]
[edit]Usage
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. The usual filename extension is '.pgn'.
There are two formats in the PGN specification, the 'import' format and the 'export' format. 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. 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 export format representations generated by different programs on the same computer should be exactly equivalent, byte for byte.
PGN code begins with a set of 'tag pairs' (a tag name and its value), followed by the 'movetext' (chess moves with optional commentary).
[edit]Tag pairs
Tag pairs begin with an initial left bracket '[', followed by the name of the tag in plain text (ASCII). The tag value is enclosed in double-quotes, and the tag is then terminated with a closing right bracket ']'. There are no special control codes involving escape characters, or carriage returns and linefeeds to separate the fields, and superfluous embedded spaces (or SPC characters) are usually skipped when parsing.
PGN data for archival storage is required to provide seven bracketed fields, referred to as 'tags' and together known as the STR (Seven Tag Roster). In export format, the STR tag pairs must appear before any other tag pairs that may appear, and in this order:
- Event: the name of the tournament or match event.
- Site: the location of the event. This is in 'City, Region COUNTRY' format, where COUNTRY is the three-letter International Olympic Committeecode for the country. An example is 'New York City, NY USA'.
- Date: the starting date of the game, in YYYY.MM.DD form. '??' are used for unknown values.
- Round: the playing round ordinal of the game within the event.
- White: the player of the white pieces, in 'last name, first name' format.
- Black: the player of the black pieces, same format as White.
- Result: the result of the game. This can only have four possible values: '1-0' (White won), '0-1' (Black won), '1/2-1/2' (Draw), or '*' (other, e.g., the game is ongoing).
The standard allows for supplementation in the form of other, optional, tag pairs. The more common tag pairs include:
- Annotator: The person providing notes to the game.
- PlyCount: String value denoting total number of half-moves played.
- TimeControl: '40/7200:3600' (moves per seconds: sudden death seconds)
- Time: Time the game started, in 'HH:MM:SS' format, in local clock time.
- Termination: Gives more details about the termination of the game. It may be 'abandoned', 'adjudication' (result determined by third-party adjudication), 'death', 'emergency', 'normal', 'rules infraction', 'time forfeit', or 'unterminated'.
- Mode: 'OTB' (over-the-board) 'ICS' (Internet Chess Server)
- FEN: The initial position of the chess board, in Forsyth-Edwards Notation. This is used to record partial games (starting at some initial position). It is also necessary for chess variants such as Fischer random chess, where the initial position is not always the same as traditional chess. If a FEN tag is used, a separate tag pair 'SetUp' must also appear and have its value set to '1'.
[edit]Movetext
The movetext describes the actual moves of the game. This includes move number indicators (numbers followed by either one or three periods; one if the next move is White's move, three if the next move is Black's move) and movetext Standard Algebraic Notation (SAN).
For most moves the SAN consists of the letter abbreviation for the piece, an 'x' if there is a capture, and the two-character algebraic name of the final square the piece moved to. The letter abbreviations are 'K' (king), 'Q' (queen), 'R' (rook), 'B' (bishop), and 'N' (knight). The pawn is given an empty abbreviation in SAN movetext, but in other contexts the abbreviation 'P' is used. The algebraic name of any square is as per usual Algebraic chess notation; from white's perspective, the leftmost square closest to white is a1, the rightmost square closest to the white is h1, and the rightmost (from white's perspective) square closest to black side is h8.
C xml serialization attribute. Etc XML attributes on the root element of the document that gets generated. Is there anyway to disable this so that absolutely no XML attribute nodes get put out in the resulting XML? I want to be able to both serialize and deserialize the XML between XML and C# objects, however, using the objects generated by xsd.exe, the C# serialization includes the xmlns:xsi., xsi.
In a few cases a more detailed representation is needed to resolve ambiguity; if so, the piece's file letter, numerical rank, or the exact square is inserted after the moving piece's name (in that order of preference). Thus, 'Nge2' specifies that the knight originally on the g-file moves to e2.
SAN kingsidecastling is indicated by the sequence 'O-O'; queenside castling is indicated by the sequence 'O-O-O' (note that these are capital letter 'O's, not numeral '0's). Pawn promotions are notated by appending an '=' to the destination square, followed by the piece the pawn is promoted to. For example: 'e8=Q'. If the move is a checking move, the plus sign '+' is also appended; if the move is a checkmating move, the number sign '#' is appended instead. For example: 'e8=Q#'.
Follow adder free trial. An annotator who wishes to suggest alternative moves to those actually played in the game may insert variations enclosed in parentheses. He may also comment on the game by inserting Numeric Annotation Glyphs (NAGs) into the movetext. Each NAG reflects a subjective impression of the move preceding the NAG or of the resultant position.
If the game result is anything other than '*', the result is repeated at the end of the movetext.
[edit]Comments
Comments are inserted by either a ';' (a comment that continues to the end of the line) or a '{' (which continues until a matching '}'). Comments do not nest.
[edit]Example
Here is a sample game in PGN format:
Chess Pgn Files
[edit]Handling chess variants
Free Pgn Files Of A Tree
Many chess variants can be recorded using PGN, provided the names of the pieces can be limited to one character, usually a letter and not a number. They are typically noted with a tag named 'Variant' giving the name of the rules. The term 'Variation' must be avoided, as that refers to the name of an opening variation. Note that traditional chess programs can only handle, at most, a few variants. Forsyth-Edwards Notation (FEN) is used to record the starting position for variants (such as Chess960) which have initial positions other than the orthodox chess initial position.
Pgn Viewer
Plycount is a chess term for the total number of moves in a game, counting each player's move as one. It is an optional part of the standard PGN description of a chess game.
