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41-556: The following rules are from the reconstruction given on the website of Jean-Louis Cazaux, based on work by him and Sonja Musser. The game is played on a 12×12 board. The king moves as like modern king. Its Betza notation is thus K . Castling does not exist in Grant Acedrex . However, on its first move, a king may make a diagonal or orthogonal leap of two squares (Betza notation AD ) in addition to its normal moves. The aanca (a beautiful and fearsome bird, very similar to

82-431: A roc , sometimes translated incorrectly as gryphon ) moves one square diagonally (like a ferz ), before optionally continuing orthogonally outward any number of squares. Its Betza notation is t[FR] . The unicornio (the illustration on the medieval codex shows a rhinoceros's head) moves like a modern knight , before continuing diagonally outward any number of squares. (In H. J. R. Murray 's translation, its first move

123-405: A through h from White's left (the queenside ) to right (the kingside ). The horizontal rows of squares, called ranks , 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". Each piece type (other than pawns)

164-420: A king: ♔ U+2654 White Chess King ♚ U+265A Black Chess King 🨀 U+1FA00 Neutral Chess King Algebraic notation (chess) Algebraic notation is the standard method for recording and describing the moves in a game of chess . It is based on a system of coordinates to uniquely identify each square on the board. It is now almost universally used by books, magazines, newspapers and software, and

205-400: A letter indicating pawn is not used, only the destination square is given. For example, c5 (pawn moves to c5). When a piece makes a capture , 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 file from which the pawn departed is used to identify the pawn. For example, exd5 (pawn on

246-593: 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. FIDE specifies draw offers to be recorded by an equals sign with parentheses "(=)" after the move on the score sheet . This is not usually included in published game scores. Castling is indicated by the special notations 0-0 (for kingside castling) and 0-0-0 ( queenside castling). O-O and O-O-O (letter O rather than digit 0) are also commonly used. A move that places

287-465: A return to the surrounding narrative text. Besides the standard (or short) algebraic notation already described, several similar systems have been used. 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

328-419: Is a non-capturing knight move, after which it acts as a bishop for the rest of the game.) Its Betza notation is t[NB] . In Grant Acedrex, a player wins by either checkmating or stalemating the opponent. A player can also win by capturing all the opponent's pieces leaving them with a bare king . The game could be sped up by using eight-sided dice to dictate which piece could move that turn, ranking them in

369-420: 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. Algebraic notation exists in various forms and languages and is based on a system developed by Philipp Stamma in the 1730s. Stamma used

410-451: 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, especially that intended for an international audience, the language-specific letters are usually replaced by universally recognized piece symbols ; for example, ♞c6 in place of Nc6 . This style

451-403: Is known as figurine algebraic notation . The Unicode Miscellaneous Symbols set includes all the symbols necessary for figurine algebraic notation. 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,

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492-400: Is necessary to provide the rank of the moving piece, i.e., R1a3 . In the case of the white queen on h4 moving to e1, neither the rank nor file alone are sufficient to disambiguate from the other white queens. As such, this move is written Qh4e1 . 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 Qh4xe1 . When

533-415: Is no indication regarding how a player won or lost (other than checkmate, see above), so simply 1–0 or 0–1 may be written to show that one player resigned or lost due to time control or forfeit. Similarly, there is more than one way for a game to end in a draw. Sometimes direct information is given by the words "White resigns" or "Black resigns", though this is not considered part of the notation but rather

574-645: 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). In international correspondence chess

615-568: Is the only form of notation recognized by FIDE , the international chess governing body. An early form of algebraic notation was invented by the Syrian player Philip Stamma in the 18th century. In the 19th century, it came into general use in German chess literature, and was subsequently adopted in Russian chess literature. In English-speaking countries, the parallel method of descriptive notation

656-559: The Game of the Century could be represented as follows in PGN: 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: or horizontally: Moves may be interspersed with commentary, called annotations . When the game score resumes with a Black move, an ellipsis (...) fills the position of

697-409: The endgame or, rarely, the middlegame . In algebraic notation , the king is abbreviated by the letter K among English speakers. The white king starts the game on e1; the black king starts on e8. Unlike all other pieces, each player can have only one king, and the kings are never removed from the board during the game. The white king starts on e1, on the first file to the right of

738-445: The macOS chess application . In Russian and ex- USSR publications, where captures are indicated by ":", checkmate can also be represented by "X" or "x". 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 forfeit , the scores 0–0, ½–0, and 0–½ are also possible. If player(s) lost by default, results are +/−, −/+, or −/−. Often there

779-532: The queen from White's perspective. The black king starts on e8, directly across from the white king. Each king starts on a square opposite its own color. A king can move one square horizontally, vertically, and diagonally unless the square is already occupied by a friendly piece or the move would place the king in check. If the square is occupied by an undefended enemy piece, the king may capture it, removing it from play. Opposing kings may never occupy adjacent squares (see opposition ) to give check, as that would put

820-424: The rook , a special move called castling . If a player's king is threatened with capture, it is said to be in check , and the player must remove the threat of capture immediately. If this cannot be done, the king is said to be in checkmate , resulting in a loss for that player. A player cannot make any move that places their own king in check. Despite this, the king can become a strong offensive piece in

861-507: 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. The table contains names for all the pieces as well as the words for chess , check , and checkmate in several languages. Several languages use

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902-567: The White move, for example: 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 simply 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+/− Descriptive notation

943-401: The bishop is. The king's predecessor is the piece of the same name in shatranj . Like the modern king, it is the most important piece in the game and can move to any neighboring square. However, in shatranj, baring the king is a win unless the opponent can do the same immediately afterward; stalemating the king is a win; and castling does not exist. Unicode defines three codepoints for

984-403: 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

1025-421: 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

1066-572: 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 . When two (or more) identical pieces can move to

1107-414: The following conditions: Castling with the h-file rook is known as castling kingside or short castling (denoted 0-0 in algebraic notation ), while castling with the a-file rook is known as castling queenside or long castling (denoted 0-0-0). A king that is under attack is said to be in check , and the player in check must immediately remedy the situation. There are three possible ways to remove

1148-413: The king from check: If none of the three options are available, the player's king has been checkmated , and the player loses the game. In casual games, when placing the opponent's king in check, it is common to announce "check", but this is not required by the rules of chess. A stalemate occurs when a player, on their turn, has no legal moves, and the player's king is not in check. If this happens,

1189-402: The king is said to have been stalemated, and the game ends in a draw . A player who has very little or no chance of winning will often, in order to avoid a loss, try to entice the opponent to inadvertently place the player's king in stalemate (see swindle ). In the opening and middlegame , the king will rarely play an active role in the development of an offensive or defensive position, with

1230-430: The king's capability as an offensive piece in the endgame, it is often considered to be slightly stronger than a bishop or knight. Emanuel Lasker gave it the value of a knight plus a pawn (i.e. four points on the scale of chess piece relative value ), though some other theorists evaluate it closer to three points. It is better at defending friendly pawns than the knight is, and it is better at attacking enemy pawns than

1271-426: The modern names of the squares (and may have been the first to number the ranks), but he used p for pawn moves and the capital original file of a piece ( A through H ) instead of the initial letter of the piece name as used now. 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

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1312-486: 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. 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,

1353-404: The moving king in check as well. The king can give discovered check , however, by unblocking a bishop , rook , or queen. The king can make a special move, in conjunction with a rook of the same color, called castling . When castling, the king moves two squares horizontally toward one of its rooks, and that rook is placed on the square over which the king crossed. Castling is permissible under

1394-531: The notable exception of a king walk . Instead, it will normally castle and seek safety on the edge of the board behind friendly pawns . In the endgame , however, the king emerges to play an active role as an offensive piece, and can assist in the promotion of the player's remaining pawns. It is not meaningful to assign a value to the king relative to the other pieces, as it cannot be captured or exchanged and must be protected at all costs. In this sense, its value could be considered infinite. As an assessment of

1435-494: 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 at

1476-480: The order: king (8), aanca (7), unicornio (6), rook (5), lion (4), crocodile (3), giraffe (2), and pawn (1). The multi-variant Chess engines Fairy-Max and Postduif can play Grant Acedrex under the XBoard or WinBoard user interface. Bibliography King (chess) The king (♔, ♚) is the most important piece in the game of chess . It may move to any adjoining square; it may also perform, in tandem with

1517-422: The same square, the moving piece is uniquely identified by specifying the piece's letter, followed by (in descending order of preference): If neither file nor rank alone is sufficient to identify the piece, then both are specified. In the diagram, both black rooks could legally move to f8, so the move of the d8-rook to f8 is disambiguated as Rdf8 . For the white rooks on the a-file which could both move to a3, it

1558-484: 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,

1599-516: 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 [ des Schachspiels ] ." 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

1640-550: Was generally used in chess publications until the 1980s. Similar descriptive systems were in use in Spain and France. A few players still use descriptive notation, but it is no longer recognized by FIDE. The term "algebraic notation" may be considered a misnomer , as the system is unrelated to algebra . 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 files , are labeled

1681-533: 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

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