Circular chess
Encyclopedia
Circular chess is a chess variant
Chess variant
A chess variant is a game related to, derived from or inspired by chess. The difference from chess might include one or more of the following:...

 played using the standard set of pieces on a circular
Circle
A circle is a simple shape of Euclidean geometry consisting of those points in a plane that are a given distance from a given point, the centre. The distance between any of the points and the centre is called the radius....

 board consisting of four rings, each of sixteen squares. This is topologically equivalent to playing on the surface of a cylinder.

History

Documents in the British Library
British Library
The British Library is the national library of the United Kingdom, and is the world's largest library in terms of total number of items. The library is a major research library, holding over 150 million items from every country in the world, in virtually all known languages and in many formats,...

 and elsewhere suggest that circular chess was played in Persia as early as the 10th century AD, and further references are found in India
India
India , officially the Republic of India , is a country in South Asia. It is the seventh-largest country by geographical area, the second-most populous country with over 1.2 billion people, and the most populous democracy in the world...

, Persia, and, later, Europe
Europe
Europe is, by convention, one of the world's seven continents. Comprising the westernmost peninsula of Eurasia, Europe is generally 'divided' from Asia to its east by the watershed divides of the Ural and Caucasus Mountains, the Ural River, the Caspian and Black Seas, and the waterways connecting...

. Historical rules are in sources that are little-known in the West, such as Muhammad ibn Mahmud Amuli
Muhammad ibn Mahmud Amuli
Muhammad ibn Mahmud al-Amuli was a medieval Persian physician from Amol, Iran.He wrote an Arabic commentary on the epitome of Avicenna's The Canon of Medicine that had been made by Yusuf al-Ilaqi....

's 'Treasury of the Sciences', so when, in 1983, Lincoln historian David Reynolds came across a reference to the game being played in the Middle Ages
Middle Ages
The Middle Ages is a periodization of European history from the 5th century to the 15th century. The Middle Ages follows the fall of the Western Roman Empire in 476 and precedes the Early Modern Era. It is the middle period of a three-period division of Western history: Classic, Medieval and Modern...

 and set about attempting to revive interest in it, he chose to draw up a new set of rules, based around those of orthodox chess
Chess
Chess is a two-player board game played on a chessboard, a square-checkered board with 64 squares arranged in an eight-by-eight grid. It is one of the world's most popular games, played by millions of people worldwide at home, in clubs, online, by correspondence, and in tournaments.Each player...

. Since that time, the older rules of circular chess have become far better known.

Rules

One set of rules for medieval circular chess is from the Persian author Amuli (1325). In this version, called shatranj al-muddawara (circular chess) or shatranj al-Rûmîya (Roman or Byzantine chess), the game uses a board with four concentric rings, each split into 16 spaces, for a total of 64 spaces. The game uses the same pieces as shatranj
Shatranj
Shatranj is an old form of chess, which came to the Western world from India. Modern chess has gradually developed from this game.-Etymology and origins:...

. The king and the counselor on the inner ring, next to each other. The next ring has the elephants, the next ring has the knights, and the last ring has the rooks. A single row of 4 pawns flanks each side of the central pieces. The king of one side "faces" the counselor of the other (a shorter path is between the king of one side and the counselor of the other than between the kings of the two sides). Movement is the same as shatranj, except that, if two pawns from the same side, going in opposite directions, end up being blocked by each other, the opponent may remove both pieces, which does not use the opponent's turn. As there is no back row, there is no promotion. A stalemate is a victory for the stalemating player. A bare king is a loss for the player who only has the king left unless, in the next turn, the player can also impose a bare king, at which point the game is a draw.

Citadel Chess

A variant of this game attested by Amuli has two "citadel" spaces in the center of the board and a different starting setup. In the citadel game, if a king reaches the citadel, a draw is forced.

Rules

The starting position is essentially obtained from that of orthodox chess by cutting the board in half and bending the two halves to join at the ends. Two lines are marked on opposite sides of the board, and each set of pieces is positioned so as to straddle this line. The king
King (chess)
In chess, the king is the most important piece. The object of the game is to trap the opponent's king so that its escape is not possible . 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 on the next move. If this cannot be...

 and queen
Queen (chess)
The queen is the most powerful piece in the game of chess, able to move any number of squares vertically, horizontally, or diagonally. Each player starts the game with one queen, placed in the middle of the first rank next to the king. With the chessboard oriented correctly, the white queen starts...

 start on the innermost ring, with, as is the case in square chess, the queen on a square of the same colour; the bishops
Bishop (chess)
A bishop is a piece in the board game of chess. Each player begins the game with two bishops. One starts between the king's knight and the king, the other between the queen's knight and the queen...

 start in the second ring from the centre, the knights
Knight (chess)
The knight is a piece in the game of chess, representing a knight . It is normally represented by a horse's head and neck. Each player starts with two knights, which begin on the row closest to the player, one square from the corner...

 on the third and the rooks
Rook (chess)
A rook is a piece in the strategy board game of chess. Formerly the piece was called the castle, tower, marquess, rector, and comes...

 on the outermost ring. The pawns
Pawn (chess)
The pawn is the most numerous and weakest piece in the game of chess, historically representing infantry, or more particularly armed peasants or pikemen. Each player begins the game with eight pawns, one on each square of the rank immediately in front of the other pieces...

 are positioned in front of the pieces.

The moves of the pieces are identical to those in orthodox chess; a queen or rook may, if it is not obstructed, move any distance round a ring, except that the "null move" of moving a piece all the way round the board and back to its original square is not permitted. A pawn is promoted after moving six squares from its initial position, to the square immediately before the opponent's starting line. Castling
Castling
Castling is a special move in the game of chess involving the king and either of the original rooks of the same color. It is the only move in chess in which a player moves two pieces at the same time. Castling consists of moving the king two squares towards a rook on the player's first rank, then...

 and en passant
En passant
En passant is a move in the board game of chess . It is a special pawn capture which can occur immediately after a player moves a pawn two squares forward from its starting position, and an enemy pawn could have captured it had it moved only one square forward...

captures are not permitted. Announcing a check is not obligatory, and "snaffling" (winning the game immediately by capturing the opponent's king after he either moved into or failed to move out of check) is allowed - and has on more than one occasion decided a world championship game.

Theory

Most textbooks on orthodox chess assign the pieces relative values of 9 points for a queen, 5 for a rook, 3 for a bishop or knight, and 1 for a pawn; although no attempt has been made to assign specific values for circular chess, it is certain that the same values do not hold. The values of the queen and rook are considerably augmented by their greater range - with two rooks or a queen and rook unobstructed on the same ring being especially powerful - while those of the bishop and knight are diminished; for example, on an 8 x 8 board two minor pieces are held to be stronger than a rook, but on a circular board the rook is considerably stronger. The minor pieces do, however, pose a significant danger value, as their moves are more difficult to visualise on the circular board and even strong players often fail to notice a threat.

One of the major differences between orthodox and circular chess in practice is in the opening. In the former, opening theory has developed over several centuries, and the use of computer analysis has resulted in top level games frequently not deviating from known theory until the 20th move or beyond; in the latter, there is virtually no opening theory, and consequently players are "on their own" from the first move. In orthodox chess, advancing the king's or queen's pawn are generally considered the best opening moves, as doing so attacks two key central squares, opens a diagonal to enable the development of a bishop, and, in the case of the king's pawn, the queen also. On a circular board these advantages are negated, as a king's or queen's pawn only attacks one square, and its advance only opens one square for the bishop. Some players advance the central pawns first anyway, while others prefer to advance the rooks' pawns in order to open lines of attack for the more powerful pieces; it is not known which move, if any, is objectively best.

The different geometry of the square and circular boards creates considerable differences in endgame theory: three of the four "basic checkmate
Checkmate
Checkmate is a situation in chess in which one player's king is threatened with capture and there is no way to meet that threat. Or, simply put, the king is under direct attack and cannot avoid being captured...

s" on a square board (those with king and rook, king and two bishops or king, bishop and knight against a lone king) rely on forcing the defending king into the corner of the board, and thus are impossible on a circular board since it doesn't have corners. The "basic mates" in circular chess are thus those with king and queen, king, rook and minor piece or king and three minor pieces against a lone king. The greater tendency towards drawn endgames often results in the defender playing on in a position which would be considered cause for resignation on a square board. In one particular endgame, however, the circular board favours the attacker: with king and pawn against king, there is no stalemate
Stalemate
Stalemate is a situation in chess where the player whose turn it is to move is not in check but has no legal moves. A stalemate ends the game in a draw. Stalemate is covered in the rules of chess....

 defence and thus, unless the defending king can capture the pawn before it can be either promoted or defended, this endgame is always a win. So most rules are as in orthodox chess.

The World Championship

Chess championship year Location Winner
1996 The Tap and Spile public house, Lincoln  Rob Stevens, Lincoln
1997 Lincoln  Francis Bowers, Peterborough
Peterborough
Peterborough is a cathedral city and unitary authority area in the East of England, with an estimated population of in June 2007. For ceremonial purposes it is in the county of Cambridgeshire. Situated north of London, the city stands on the River Nene which flows into the North Sea...

1998 Lincoln  Francis Bowers, Peterborough
Peterborough
Peterborough is a cathedral city and unitary authority area in the East of England, with an estimated population of in June 2007. For ceremonial purposes it is in the county of Cambridgeshire. Situated north of London, the city stands on the River Nene which flows into the North Sea...

1999 Lincoln  Francis Bowers, Peterborough
Peterborough
Peterborough is a cathedral city and unitary authority area in the East of England, with an estimated population of in June 2007. For ceremonial purposes it is in the county of Cambridgeshire. Situated north of London, the city stands on the River Nene which flows into the North Sea...

2000 Lincoln  Herman Kok
2001 Lincoln  Francis Bowers, Peterborough
Peterborough
Peterborough is a cathedral city and unitary authority area in the East of England, with an estimated population of in June 2007. For ceremonial purposes it is in the county of Cambridgeshire. Situated north of London, the city stands on the River Nene which flows into the North Sea...

2002 Bishop Edward King House, Lincoln  David Howell
David Howell (chess player)
David Wei Liang Howell is an English chess player. He is the youngest chess Grandmaster in the United Kingdom, a title he earned when he came second during the 35th Rilton Cup in Stockholm on 5 January 2007 when he was 16...

2003 Bishop Edward King House, Lincoln  Francis Bowers, Peterborough
Peterborough
Peterborough is a cathedral city and unitary authority area in the East of England, with an estimated population of in June 2007. For ceremonial purposes it is in the county of Cambridgeshire. Situated north of London, the city stands on the River Nene which flows into the North Sea...

2004 Lincoln  Francis Bowers, Peterborough
Peterborough
Peterborough is a cathedral city and unitary authority area in the East of England, with an estimated population of in June 2007. For ceremonial purposes it is in the county of Cambridgeshire. Situated north of London, the city stands on the River Nene which flows into the North Sea...

2005 Lincoln Cathedral
Lincoln Cathedral
Lincoln Cathedral is a historic Anglican cathedral in Lincoln in England and seat of the Bishop of Lincoln in the Church of England. It was reputedly the tallest building in the world for 249 years . The central spire collapsed in 1549 and was not rebuilt...

 
Michael Jones, Lincoln
2006 Lincoln Castle
Lincoln Castle
Lincoln Castle is a major castle constructed in Lincoln, England during the late 11th century by William the Conqueror on the site of a pre-existing Roman fortress. The castle is unusual in that it has two mottes. It is only one of two such castles in the country, the other being at Lewes in Sussex...

 
Herman Kok
2007 The Tap & Spile public house, Lincoln  Kevin McCarthy

After experimenting with various possible layouts for the game, Reynolds decided on that pictured above, constructed a board and introduced the game to other players in Lincoln
Lincoln, Lincolnshire
Lincoln is a cathedral city and county town of Lincolnshire, England.The non-metropolitan district of Lincoln has a population of 85,595; the 2001 census gave the entire area of Lincoln a population of 120,779....

; it caught on, and in 1996 the Circular Chess Society was formed, with the aim of popularising circular chess, primarily by organising a tournament. Since it was not known to be played competitively anywhere else, its claim to the status of world championship was not contested, and thus it became. The inaugural tournament was held in the Tap and Spile public house in Lincoln in 1996; it was played as a knockout, with Lincoln player Rob Stevens beating Nottinghamshire's Mark Spink in the final. Subsequently the tournament has been held at different venues in Lincoln, usually under the Swiss system, and has been dominated by two players: Peterborough engineer Francis Bowers and Dutch businessman Herman Kok, who between them won eight of the following ten tournaments. Bowers took the title from 1997 to 1999, and remains not just the only player to have won the tournament three years in succession, but the only one to win on more than two occasions; Kok broke the sequence with victory in the 2000 tournament, before Bowers won again in 2001.

The 2002 World Championship, staged in Bishop Edward King House in Lincoln and sponsored by the Duke William Hotel, saw the only instance to date of the participation in the tournament of a player widely known outside the world of circular chess: David Howell
David Howell (chess player)
David Wei Liang Howell is an English chess player. He is the youngest chess Grandmaster in the United Kingdom, a title he earned when he came second during the 35th Rilton Cup in Stockholm on 5 January 2007 when he was 16...

, then aged 11 and having recently gained national publicity by becoming the youngest player to avoid defeat (at standard chess) against a reigning world champion, with a draw in the final game of his match against Vladimir Kramnik
Vladimir Kramnik
Vladimir Borisovich Kramnik is a Russian chess grandmaster. He was the Classical World Chess Champion from 2000 to 2006, and the undisputed World Chess Champion from 2006 to 2007...

 (having lost the other three games). Howell won the tournament, scoring a maximum 5 points after beating Bowers in the final round, although he commented afterwards "This is the first time I have played in a circular chess contest and it was difficult. Circular chess is a lot harder to play than square chess. Every time you or your opponent makes a move, you have to think about what is happening on the other side of the board.". Kok finished runner-up with 4½ points.

The 2003 tournament was again held in Bishop Edward King House; sponsorship for it and the four subsequent tournaments came from Lindum Group. Howell did not return to defend his title (and has not played in the tournament since); Bowers gained his fifth title with victory over Kok in the last round to complete a 5/5 score, and Lincolnshire player David Carew, with 4½, finished second. Bowers repeated the feat the following year, again finishing with a win against Kok; Nottinghamshire's Mike Clark was the runner-up, with Stevens third and Kok and Carew among a group of six players in joint fourth place.

In 2005 the Society gained extra publicity for the tournament by securing the chapter house
Chapter house
A chapter house or chapterhouse is a building or room attached to a cathedral or collegiate church in which meetings are held. They can also be found in medieval monasteries....

 of Lincoln Cathedral
Lincoln Cathedral
Lincoln Cathedral is a historic Anglican cathedral in Lincoln in England and seat of the Bishop of Lincoln in the Church of England. It was reputedly the tallest building in the world for 249 years . The central spire collapsed in 1549 and was not rebuilt...

 as the venue, only the day after the filming of The Da Vinci Code
The Da Vinci Code (film)
The Da Vinci Code is a 2006 American mystery thriller film directed by Ron Howard. The screenplay was written by Akiva Goldsman and based on Dan Brown's worldwide bestselling 2003 novel, The Da Vinci Code...

there had been completed (the cathedral was used to film scenes which, in the book
The Da Vinci Code
The Da Vinci Code is a 2003 mystery-detective novel written by Dan Brown. It follows symbologist Robert Langdon and Sophie Neveu as they investigate a murder in Paris's Louvre Museum and discover a battle between the Priory of Sion and Opus Dei over the possibility of Jesus having been married to...

, take place in Westminster Abbey
Westminster Abbey
The Collegiate Church of St Peter at Westminster, popularly known as Westminster Abbey, is a large, mainly Gothic church, in the City of Westminster, London, United Kingdom, located just to the west of the Palace of Westminster. It is the traditional place of coronation and burial site for English,...

, since the abbey had refused Columbia Pictures
Columbia Pictures
Columbia Pictures Industries, Inc. is an American film production and distribution company. Columbia Pictures now forms part of the Columbia TriStar Motion Picture Group, owned by Sony Pictures Entertainment, a subsidiary of the Japanese conglomerate Sony. It is one of the leading film companies...

 permission to film there); much of the film set was (and is) still in place. The draw for the first round of the tournament was conducted by Councillor Steve Allnutt, the Deputy Mayor
Mayor
In many countries, a Mayor is the highest ranking officer in the municipal government of a town or a large urban city....

 of Lincoln, and Mrs Chris Noble, the City Sheriff; the two guests accepted an invitation to try the game for themselves, with the Sheriff emerging as the winner. In contrast to previous tournaments, the 2005 championship was held over four rounds rather than five; in the first Stevens drew with Bowers, to end the latter's run of ten consecutive wins in the tournament and leave Kok the favourite to take the title again. At the halfway point there were four players with maximum points - Kok, Hertfordshire's John Beasley, and tournament newcomers David Stamp and Michael Jones, both of Lincolnshire - with Bowers on 1½ after surviving a scare to "snaffle" Carew in the second round. Kok beat Beasley in the third round, while Stamp and Jones remained in contention after both winning; Bowers also won, although, since the top four players would be drawn against each other in the final round, his chances of retaining his title were remote, relying on him winning his own game and the other being drawn to force a three-way playoff. The draw for the final round pitted Kok against Jones and Bowers against Stamp - in each case an experienced player against a tournament newcomer. The former game looked to be heading in Kok's favour before he blundered in time trouble and eventually lost on time, leaving Jones on 4/4 and Stamp needing to beat Bowers to force a tiebreak; he could only draw, so Jones finished the outright champion and Stamp runner-up with 3½. Bowers, Herman Kok, his son Robbie, Beasley and Clark tied for third place with 3 points each.

The 2006 World Championship was held at Lincoln Castle
Lincoln Castle
Lincoln Castle is a major castle constructed in Lincoln, England during the late 11th century by William the Conqueror on the site of a pre-existing Roman fortress. The castle is unusual in that it has two mottes. It is only one of two such castles in the country, the other being at Lewes in Sussex...

, and was dedicated to regular competitor Charles Vermes of Derbyshire, who had died shortly before. The first round brought no surprise results - the only two of the main contenders to be drawn together were Clark and Stevens, with Clark emerging the winner; Jones, Herman Kok and Bowers all won. Clark beat Jones in the second round, at which point there remained five players on maximum points: Clark, Kok, Bowers, Lincolnshire's Richard Kidals and Ian Lewis of Cardiff. Lewis lost his third round game to tournament founder Reynolds, but the other four leaders all won, ensuring the need for a tiebreak unless one of the last round games was drawn; Kok beat Clark and Bowers beat Kidals to give them both the maximum 4 points, so the expected tiebreak game ensued. The game was close throughout, with Bowers eventually losing on time to give Kok the title - only the second player, after Bowers himself, to claim it more than once.

The 2007 World Championship was held at The Tap & Spile in Lincoln, with Kevin McCarthy lifting the title after remaining unbeaten in his first ever tournament under Circular Rules, including a win against the legendary Herman Kok, who had taught him the rules only a fortnight previously.

External links

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