Algebraic notation (chess)

Each square of the board is identified by a unique coordinate pair—a letter and a number—from White's point of view. The vertical columns of squares, called '', are labeled a through h'' from White's left (the ) to right (the ). The horizontal rows of squares, called '', are numbered 1 to 8'' starting from White's side of the board. Thus each square has a unique identification of file letter followed by rank number. For example, the initial square of White's king is designated as "e1". ==Naming the pieces==

Each piece type (other than pawns) is identified by an uppercase letter. English-speaking players use the letters K for king, Q for queen, R for rook, B for bishop and N for knight. Different initial letters are used by other languages. In modern chess literature, the language-specific letters are usually replaced by universally recognizable piece symbols; for example, ♞c6 in place of Nc6. This style is known as figurine algebraic notation. The Unicode Miscellaneous Symbols set includes all the symbols necessary for figurine algebraic notation. ==Notation for moves==

In standard (or short-form) algebraic notation, each move of a piece is indicated by the piece's uppercase letter, plus the coordinates of the destination square. For example, Be5 (bishop moves to e5), Nf3 (knight moves to f3). For pawn moves, a letter indicating pawn is not used, only the destination square is given. For example, c5 (pawn moves to c5). Captures When a piece makes a , an "x" is inserted immediately before the destination square. For example, Bxe5 (bishop captures the piece on e5). When a pawn makes a capture, the from which the pawn departed is used to identify the pawn. For example, exd5 (pawn on the e-file captures the piece on d5). En passant captures are indicated by specifying the capturing pawn's file of departure, the "x", the destination square (not the square of the captured pawn) and (optionally) the suffix "e.p." indicating the capture was en passant. For example, exd6 e.p. Sometimes a multiplication sign (×) or a colon (:) is used instead of "x", either in the middle (B:e5) or at the end (Be5:). Some publications, such as the Encyclopaedia of Chess Openings (ECO), omit any indication that a capture has been made; for example, Be5 instead of Bxe5; ed6 instead of exd6 or exd6 e.p. When it is unambiguous to do so, a pawn capture is sometimes described by specifying only the files involved (exd or even ed). These shortened forms are sometimes called abbreviated algebraic notation or minimal algebraic notation. Disambiguating moves When two (or more) identical pieces can move to the same square, the moving piece is uniquely identified by specifying the piece's letter, followed by (in descending order of preference): • the file of departure (if they differ); • the rank of departure (if the files are the same but the ranks differ); • both the file and rank of departure (if neither file nor rank alone is sufficient to identify the piece). This only occurs when three or more pieces of the same type can move to the same square (double disambiguation). In the diagram, both white rooks could legally move to e8, so the move of the c8-rook to e8 is disambiguated as Rce8. For the black rooks on the a-file which could both move to a4, it is necessary to provide the of the moving piece, i.e., R2a4. In the case of the black bishops, which can both move to e5, only the file is specified, hence Bge5, despite both the file and rank differing, since stating only the file is sufficient to disambiguate. In the case of the white queen on h3 moving to f1, neither the rank nor file alone are sufficient to disambiguate from the other white queens, since the others are respectively on the same file and rank as the h3-queen. As such, this move is written Qh3f1. Were one of the other queens to move to f1 instead, Qff1 for the f3-queen or Q1f1 for the h1-queen would be sufficient, as they respectively are the only white queens in file f or rank 1. As above, an "x" can be inserted to indicate a capture; for example, if the final case were a capture, it would be written as Qh3xf1. Pawn promotion When a pawn promotes, the piece promoted to is indicated at the end. For example, a pawn on e7 promoting to a queen on e8 may be variously rendered as e8Q, e8=Q, e8(Q), e8/Q etc. Castling Castling is indicated by the special notations 0-0 (for castling) and 0-0-0 ( castling). O-O and O-O-O (letter O rather than digit 0) are also commonly used. Check A move that places the opponent's king in check usually has the symbol "+" appended. Alternatively, sometimes a dagger (†) or the abbreviation "ch" is used. Some publications indicate a discovered check with an abbreviation such as "dis ch", or with a specific symbol. Double check is usually indicated the same as check, but is sometimes represented specifically as "dbl ch" or "++", particularly in older chess literature. Some publications such as ECO omit any indication of check. Checkmate Checkmate at the completion of moves is represented by the symbol "#" in standard FIDE notation and PGN. The word mate is commonly used instead; occasionally a double dagger () or a double plus sign (++) is used, although the double plus sign is also used to represent "double check" when a king is under attack by two enemy pieces simultaneously. A checkmate is represented by "" (the not equal sign) in the macOS chess application. In Russian and ex-USSR publications, where captures are indicated by ":", checkmate can also be represented by "X" or "x". Draw offer FIDE specifies draw offers to be recorded by an equals sign with parentheses "(=)" after the move on the . This is not usually included in published game scores. End of game The notation 1–0 at the completion of moves indicates that White won, 0–1 indicates that Black won and ½–½ indicates a draw. In case of , the scores 0–0, ½–0 and 0–½ are also possible. In case of loss by default, results are +/−, −/+ or −/−. Except in the case of checkmate, there is no information in the notation regarding the circumstance of the final result. Merely 1–0 or 0–1 is written whether a player resigned, lost due to time control or forfeited; in the case of a draw ½–½ is written whether the draw was decided by mutual agreement, repetition, stalemate, 50-move rule or dead position. Sometimes direct information is given by words such as "resigns", "draw agreed" etc., but this is not considered part of the notation, rather a part of the narrative text. ==Similar notations==

Besides standard (or short form) algebraic notation already described, several similar systems have been used. Long algebraic notation In long algebraic notation, also known as fully expanded algebraic notation, both the starting and ending squares are specified, for example: e2e4. Sometimes these are separated by a hyphen, e.g. Nb1-c3, while captures are indicated by an "x", e.g. Rd3xd7. Long algebraic notation takes more space and is no longer commonly used in print; however, it has the advantage of clarity. Both short and long algebraic notation are acceptable for keeping a record of the moves on a scoresheet, as is required in FIDE rated games. A form of long algebraic notation (without piece names) is also used by the Universal Chess Interface (UCI) standard, which is a common way for graphical chess programs to communicate with chess engines, e.g. e2e4, e1g1 (castling), e7e8q (promotion). ICCF numeric notation In international correspondence chess the use of algebraic notation may cause confusion, since different languages employ different names (and therefore different initial letters) for the pieces, and some players may be unfamiliar with the Latin alphabet. Hence, the standard for transmitting moves by post or email is ICCF numeric notation, which identifies squares using numerical coordinates, and identifies both the departure and destination squares. For example, the move 1.e4 is rendered as 1.5254. In recent years, the majority of correspondence games have been played on on-line servers rather than by email or post, leading to a decline in the use of ICCF numeric notation. PGN Portable Game Notation (PGN) is a text-based file format for storing chess games, which uses standard English algebraic notation and a small amount of markup. PGN can be processed by almost all chess software, as well as being easily readable by humans. For example, the Game of the Century could be represented as follows in PGN: ==Formatting==

A game or series of moves is generally written in one of two ways; in two columns, as White/Black pairs, preceded by the move number and a period: :1. e4 e5 :2. Nf3 Nc6 :3. Bb5 a6 or horizontally: :1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 Moves may be interspersed with commentary, called annotations. When the resumes with a Black move, an ellipsis (...) fills the position of the White move, for example: :1. e4 e5 2. Nf3 ::White attacks the black e-pawn. :2... Nc6 ::Black defends and develops simultaneously. :3. Bb5 ::White plays the Ruy Lopez. :3... a6 ::Black elects Morphy's Defense. ==Annotation symbols==

Though not technically a part of algebraic notation, the following are some symbols commonly used by annotators, for example in publications Chess Informant and Encyclopaedia of Chess Openings, to give editorial comment on a move or position. The symbol chosen is appended to the end of the move notation, for example, in the Soller Gambit: 1.d4 e5?! 2.dxe5 f6 3.e4! Nc6 4.Bc4+/−. Moves Positions ==History==

Descriptive notation was usual in the Middle Ages in Europe. A form of algebraic chess notation that seems to have been borrowed from Muslim chess, however, appeared in Europe in a 12th-century manuscript referred to as "MS. Paris Fr. 1173 (PP.)". The files run from a to h, just as they do in the current standard algebraic notation. The ranks, however, are also designated by letters, with the exception of the 8th rank which is distinct because it has no letter. The ranks are lettered in reverse – from the 7th to the 1st: k, l, m, n, o, p, q. Another system of notation using only letters appears in a book of Mediaeval chess, Rechenmeister Jacob Köbel's Schachzabel Spiel of 1520. Piece letters were introduced in the 1780s by Moses Hirschel, and Johann Allgaier with Aaron Alexandre developed the modern castling notation in the 1810s. Algebraic notation was described in 1847 by Howard Staunton in his book ''The Chess-Player's Handbook. Staunton credits the idea to German authors, and in particular to "Alexandre, Jaenisch and the Handbuch'' ". While algebraic notation has been used in German and Russian chess literature since the 19th century, the Anglosphere was slow to adopt it, using descriptive notation for much of the 20th century. Beginning in the 1970s, algebraic notation gradually became more common in English language publications, and by 1980 it had become the prevalent notation. In 1981, FIDE stopped recognizing descriptive notation, and algebraic notation became the accepted international standard. File:Ms. Paris 1173.png|Chess diagram found in a French manuscript (1173) File:Jacob Köbel 1520.png|Chess diagram from Jacob Köbel's German book about Mediaeval chess, Schachzabel Spiel (1520) File:Chess diagram from Howard Staunton's "The Chess-Player's Handbook" (1947).png|Chess diagram showing algebraic notation in Howard Staunton's ''The Chess-Player's Handbook'' (1866) ==Piece names in various languages==

The table contains names for all the pieces as well as the words for , and in several languages. Several languages use the Arabic loanword alfil for the piece called bishop in English; in this context it is a chess-specific term which no longer has its original meaning of "elephant". ==See also==