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History of chess
The precursors of chess originated in India during the Gupta empire, where its early form in the 6th century was known as chaturaṅga, which translates as "four divisions [of the military]": infantry, cavalry, elephantry, and chariotry, represented by the pieces that would evolve into the modern pawn, knight, bishop, and rook, respectively. In Sassanid Persia around 600 the name became chatrang and the rules were developed further, and players started calling "Shāh!" (Persian for "King!") when attacking the opponent's king, and "Shāh māt!" (Persian for "the king is finished") when the king was attacked and could not escape from attack; these exclamations persisted in chess as it traveled to other lands thereafter.
The game was taken up by the Muslim world after the Islamic conquest of Persia, with the pieces largely retaining their Persian names; in Arabic "māt" or "māta" مَاتَ means "died", "is dead". In Arabic, the game became shatranj. The Moors of North Africa rendered "shatranj" as shaterej which gave rise to the Spanish acedrex, axedrez and ajedrez; in Portuguese it became xadrez, and in Greek zatrikion, but in the rest of Europe it was replaced by versions of the Persian shāh ("king"). Thus, the game came to be called şah in Romanian, šah in Slovene, Schach in German, schaken in Dutch, shakki in Finnish, szachy in Polish, scacchi in Italian, šahs in Latvian, skak in Danish, sjakk in Norwegian, schack in Swedish, escacs in Catalan, and échecs in French (Old French eschecs); there are two theories about why this change happened:
- From the exclamation "check" or "checkmate" as it was pronounced in various languages.
- From the first chessmen known of in Western Europe (except Iberia and Greece) being ornamental chess kings brought in as curios by Muslim traders.
Chess spread directly from the Middle East to Russia, where chess became known as шахматы (shakhmaty, treated as a plural).
The game reached Western Europe and Russia by at least three routes, the earliest being in the 9th century. By the year 1000 it had spread throughout Europe. Introduced into the Iberian Peninsula by the Moors in the 10th century, it was described in a famous 13th century manuscript covering shatranj and backgammon and dice named the Libro de los juegos.
Chess spread throughout the world and many variants of the game soon began taking shape. This game was introduced to the Near East from India and became a part of the princely or courtly education of Persian nobility.Buddhist pilgrims, Silk Road traders and others carried it to the Far East where it was transformed and assimilated into a game often played on the intersection of the lines of the board rather than within the squares. Chaturanga reached Europe through Persia, the Byzantine empire and the expanding Arabian empire.Muslims carried chess to North Africa, Sicily, and the Iberia by the 10th century.
The game was developed extensively in Europe, and by the late 15th century, it had survived a series of prohibitions and Christian Church sanctions to almost take the shape of the modern game.Modern times saw reliable reference works, competitive chess tournaments and exciting new variants which added to the game's popularity, further bolstered by reliable timing mechanisms (first introduced in 1861), effective rules and charismatic players.
The earliest precursor of modern chess is a game called chaturanga, which flourished in India by the 6th century, and is the earliest known game to have two essential features found in all later chess variations — different pieces having different powers (which was not the case with checkers and go), and victory depending on the fate of one piece, the king of modern chess. Other game pieces (speculatively called "chess pieces") uncovered in archaeological findings are considered as coming from other, distantly related, board games, which may have had boards of 100 squares or more.
Chess was designed for an ashtāpada (Sanskrit for "having eight feet", i.e. an 8x8 squared board), which may have been used earlier for a backgammon-type race game (perhaps related to a dice-driven race game still played in south India where the track starts at the middle of a side and spirals in to the center). Ashtāpada, the uncheckered 8×8 board served as the main board for playing Chaturanga. Other Indian boards included the 10×10 Dasapada and the 9×9 Saturankam. Traditional Indian chessboards often have X markings on some or all of squares a1 a4 a5 a8 d1 d4 d5 d8 e1 e4 e5 e8 h1 h4 h5 h8: these may have been "safe squares" where capturing was not allowed in a dice-driven backgammon-type race game played on the ashtāpada before chess was invented.
The Cox-Forbes theory, started in the late 19th century, mainly from the works of Captain Hiram Cox and Duncan Forbes, proposed that the four-handed game chaturaji was the original form of chaturanga. Other scholars dispute this and say that the two-handed form was the first.
In Sanskrit, "chaturanga" (चतुरङ्ग) literally means "having four limbs (or parts)" and in epic poetry often means "army" (the four parts are elephants, chariots, horsemen, foot soldiers). The name came from a battle formation mentioned in the Indian epic Mahabharata. The game Chaturanga was a battle simulation game which rendered Indian military strategy of the time.
Some people formerly played chess using a dice to decide which piece to move. There was an unproven theory that chess started as this dice-chess and that the gambling and dice aspects of the game were removed because of Hindu religious objections.
Scholars in areas to which the game subsequently spread, for example the Arab Abu al-Hasan 'Alī al-Mas'ūdī, detailed the Indian use of chess as a tool for military strategy, mathematics, gambling and even its vague association with astronomy. Mas'ūdī notes that ivory in India was chiefly used for the production of chess and backgammon pieces, and asserts that the game was introduced to Persia from India, along with the book Kelileh va Demneh, during the reign of emperor Nushirwan.
In some variants, a win was by checkmate, or by stalemate, or by "bare king" (taking all of an opponent's pieces except the king).
In some parts of India the pieces in the places of the Rook and Knight and Bishop were renamed by words meaning (in this order) Boat, Horse, Elephant, or Elephant, Horse, Camel, but keeping the same moves.
In early chess the moves of the pieces were:
- King: as now.
- Queen: one square diagonally, only.
- In the version that went into Persia: two squares diagonally (no more or less), but could jump over a piece between
- In a version sometimes found in India in former times: two squares sideways or front-and-back (no more or less), but could jump over a piece between.
- In versions found in Southeast Asia: one square diagonally, or one square forwards.
- Knight: as now.
- Rook: as now.
- Pawn: one square forwards (not two), capturing one square diagonally forward; promoted to queen only.
- A stalemated player thereby at once wins.
- A stalemated king can take one of the enemy pieces that would check the king if the king moves Iran (Persia)
Persian manuscript from the 14th century describing how an ambassador from India brought chess to the Persian court.
The Karnamak-i Ardeshir-i Papakan, a Pahlavi epical treatise about the founder of the Sassanid Persian Empire, mentions the game of chatrang as one of the accomplishments of the legendary hero, Ardashir I, founder of the Empire. The oldest recorded game in chess history is a 10th century game played between a historian from Baghdad and a pupil.
In the 11th century Shahnameh, Ferdowsi describes a Raja visiting from India who re-enacts the past battles on the chessboard. A translation in English, based on the manuscripts in the British Museum, is given below:
- One day an ambassador from the king of Hind arrived at the Persian court of Chosroes, and after an oriental exchange of courtesies, the ambassador produced rich presents from his sovereign and amongst them was an elaborate board with curiously carved pieces of ebony and ivory. He then issued a challenge:
- "Oh great king, fetch your wise men and let them solve the mysteries of this game. If they succeed my master the king of Hind will pay tribute as an overlord, but if they fail it will be proof that the Persians are of lower intellect and we shall demand tribute from Iran."
- The courtiers were shown the board, and after a day and a night in deep thought one of them, Bozorgmehr, solved the mystery and was richly rewarded by his delighted sovereign.
- (One recent chess book author thought that this story may be true, and that Bozorgmehr likely found the rules by bribing the Indian envoys.)
The appearance of the chess pieces had altered greatly since the times of chaturanga, with ornate pieces and chess pieces depicting animals giving way to abstract shapes. The Islamic sets of later centuries followed a pattern which assigned names and abstract shapes to the chess pieces, as Islam forbids depiction of animals and human beings in art. These pieces were usually made of simple clay and carved stone.
 East Asia
As a strategy board game played in China, chess is believed to have been derived from the Indian Chaturanga. Chaturanga was transformed and assimilated into the game xiangqi where the pieces are placed on the intersection of the lines of the board rather than within the squares. The object of the Chinese variation is similar to Chaturanga, i.e. to render helpless the opponent's king, sometimes known as general. Chinese chess also borrows elements from the game of Go, which was played in China since at least the 6th century BC. Owing to the influence of Go, Chinese chess is played on the intersections of the lines on the board, rather than in the squares. Chinese chess pieces are usually flat and resemble those used in checkers.
An alternative origin theory contends that chess arose from Xiangqi or a predecessor thereof, existing in China since the 2nd century BC.David H. Li, a retired accountant, professor of accounting and translator of ancient Chinese texts, hypothesizes that general Han Xin drew on the earlier game of Liubo to develop an early form of Chinese chess in the winter of 204–203 BC. The German chess historian Peter Banaschak, however, points out that Li's main hypothesis "is based on virtually nothing". He notes that the "Xuanguai lu," authored by the Tang Dynasty minister Niu Sengru (779–847), remains the first real source on the Chinese chess variant xiangqi.
A prominent variant of chess in East Asia is the game of Shogi, transmitted from India to China and Korea before finally reaching Japan. The two distinguishing features of Shogi are: 1) The captured pieces may be reused by the captor and played as a part of the captor's forces, and 2) Pawns capture as they move, one square straight ahead.
Chess is recorded from Mongolian-inhabited areas, where the pieces are now called:
- King: - Noyon - Ноён - lord
- Queen - Bers / Nohoi - Бэрс / Нохой - dog (to guard the livestock)
- Bishop: - Temē - Тэмээ - camel
- Knight- Morĭ - Морь - horse
- Rook - Tereg - Тэрэг - cart
- Pawn - Hū - Хүү - boy (the piece often showed a puppy)
Names recorded from the 1880s by Russian sources, quoted in Murray, among the Soyot people (who at the time spoke the Soyot Turkic language) include: merzé (dog), täbä (camel), ot (horse), ōl (child) and Mongolian names for the other pieces.
The change with the Queen is likely due to the Arabic word firzān or Persian word farzīn (= "vizier") being confused with Turkic or Mongolian native words (merzé = "mastiff", bar or bars = "tiger", arslan = "lion").
Chess in Mongolia is now played following the usual international rules.
 East Siberia
Chess was also recorded from the Yakuts, Tunguses, and Yukaghirs; but only as a children's game among the Chukchi. Chessmen have been collected from the Yakutat people in Alaska, having no resemblance to European chessmen, and thus likely part of a chess tradition coming from Siberia.
 Arab world
Chess passed from Persia to the Arab world, where its name changed to Arabic shatranj. From there it passed to Western Europe, probably via Spain.
Over the centuries, features of European chess (e.g. the modern moves of Queen and Bishop, and castling) found their way via trade into Islamic areas. Murray's sources found the old moves of Queen and Bishop still current in Ethiopia.
 Early history
Shatranj made its way via the expanding Islamic Arabian empire to Europe and the Byzantine empire. Chess appeared in Southern Europe during the end of the first millennium, often introduced to new lands by conquering armies, such as the Norman Conquest of England. Chess remained largely unpopular in Northern Europe but started gaining popularity as soon as figure pieces were introduced.
The sides are conventionally called White and Black. But, in earlier European chess writings, the sides were often called Red and Black because those were the commonly available colors of ink when handwriting drawing a chess game layout. In such layouts, each piece was represented by its name, often abbreviated (e.g. "ch'r" for French "chevalier" = "knight").
The social value attached to the game – seen as a prestigious pastime associated with nobility and high culture – is clear from the expensive and exquisitely made chessboards of the medieval era. The popularity of chess in the Western courtly society peaked between the 12th and the 15th centuries. The game found mention in the vernacular and Latin language literature throughout Europe, and many works were written on or about chess between the 12th and the 15th centuries.Harold James Ruthven Murray divides the works into three distinct parts: the didactic works e.g. Alexander of Neckham's De scaccis (approx. 1180); works of morality like Liber de moribus hominum et officiis nobilium sive super ludo scacchorum (Book of the customs of men and the duties of nobles or the Book of Chess), written by Jacobus de Cessolis; and the works related to various chess problems, written largely after 1205. Chess terms, like check, were used by authors as a metaphor for various situations. Chess was soon incorporated into the knightly style of life in Europe.Peter Alfonsi, in his work Disciplina Clericalis, listed chess among the seven skills that a good knight must acquire. Chess also became a subject of art during this period, with caskets and pendants decorated in various chess forms.Queen Margaret of England's green and red chess sets – made of jasper and crystal – symbolized chess's position in royal art treasures. Kings Henry I, Henry II and Richard I of England were chess patrons. Other monarchs who gained similar status were Alfonso X of Castile and Ivan IV of Russia.
Saint Peter Damian denounced the bishop of Florence in 1061 for playing chess even when aware of its evil effects on the society. The bishop of Florence defended himself by declaring that chess involved skill and was therefore "unlike other games," similar arguments followed in the coming centuries. Two separate incidents in 13th century London involving men of Essex resorting to violence resulting in death as an outcome of playing chess further caused sensation and alarm. The growing popularity of the game – now associated with revelry and violence – alarmed the Church.
The practice of playing chess for money became so widespread during the 13th century that Louis IX of France issued an ordinance against gambling in 1254. This ordinance turned out to be unenforceable and was largely neglected by the common public, and even the courtly society, which continued to enjoy the now prohibited chess tournaments uninterrupted.
By the mid-12th century, the pieces of the chess set were depicted as kings, queens, bishops, knights and men at arms. Chessmen made of ivory began to appear in North-West Europe, and ornate pieces of traditional knight warriors were used as early as the mid 13th century. The initially nondescript pawn had now found association with the pedes, pedinus, or the footman, which symbolized both infantry and loyal domestic service.
|Mantri (Minister)||Vazir (Vizir)||Wazir/Firz||Regina||Queen||Reina||Regina||Reine|
|Gajah (war elephant)||Pil||Al-Phil/Fil||Episcopus/Comes/Calvus||Bishop/Count/Councillor||Alfil/Obispo||Alfiere||Fou|
The game, as played during the early Middle Ages, was slow, with many games lasting for days. Some variations in rules began to change the shape of the game in by 1300 AD. A notable, but initially unpopular, change was the ability of the pawn to move two places in the first move instead of one.
In Europe some of the pieces gradually got new names:
- Fers: "queen", because it starts beside the King.
- Aufin: "bishop", because its two points looked like a bishop's mitre; In French fou; and others. Its Latin name alfinus was reinterpreted many ways.
Attempts to make the start of the game run faster to get the opposing pieces in contact sooner included:
- Pawn moving two squares in its first move. This led to the en passant rule: a pawn placed so that it could have captured the enemy pawn if it had moved one square forward was allowed to capture it on the passed square. In Italy, the contrary rule (passar battaglia = "to pass battle") applied: a pawn that moved two squares forward had passed the danger of attack on the intermediate square. It was sometimes not allowed to do this to cover check.
- King jumping once, to make it quicker to put the king safe in a corner. (This eventually led to castling.)
- Queen once moving two squares with jump, diagonally or straight. This right was sometimes extended to a new queen made by promoting a pawn.
- The short assize. ("assize" = "sitting".) Here the pawns started on the third rank; the queens started on d3 and d6 along with the queens' pawns; the players arranged their other pieces as they wished behind their pawns at the start of the game. This idea did not endure.
Other sporadic variations in the rules of chess included:
- Ignoring check from a piece which was covering check, as some said that in theory (in this example), B x K would allow R x K in reply.
 Origins of the modern game
The queen and bishop remained relatively weak until between 1475 AD and 1500 AD in Spain or Portugal or France or Italy, the queen's and bishop's modern moves started and spread, making chess close to its modern form. This form of chess got such names as "Queen's Chess" or "Mad Queen Chess" (Italian alla rabiosa = "in the mad manner"). This led to much more value being attached to the previously minor tactic of pawn promotion.Checkmate became easier and games could now be won in fewer moves. These new rules quickly spread throughout western Europe and in Spain, with the exception of the rules about stalemate, which were finalized in the early nineteenth century.
In some areas (e.g. Russia), the queen could also move like a knight.
An Italian player, Gioacchino Greco, regarded as one of the first true professionals of the game, authored an analysis of a number of composed games that illustrated two differing approaches to chess. This influential work went to some extent in popularizing chess and demonstrated the many theories regarding gameplay and tactics.
The first full work dealing with the various winning combinations was written by François-André Danican Philidor of France, regarded as the best chess player in the world for nearly 50 years, and published in the 18th century. He wrote and published L'Analyse des échecs (The Analysis of Chess), an influential work which appeared in more than 100 editions.
A tactical puzzle from Lucena's 1497 book
Writings about the theory of how to play chess began to appear in the 15th century. The oldest surviving printed chess book, Repetición de Amores y Arte de Ajedrez (Repetition of Love and the Art of Playing Chess) by Spanish churchman Luis Ramirez de Lucena was published in Salamanca in 1497. Lucena and later masters like Portuguese Pedro Damiano, Italians Giovanni Leonardo Di Bona, Giulio Cesare Polerio and Gioachino Greco or Spanish bishop Ruy López de Segura developed elements of openings and started to analyze simple endgames. In the eighteenth century the center of European chess life moved from the Southern European countries to France. The two most important French masters were François-André Danican Philidor, a musician by profession, who discovered the importance of pawns for chess strategy, and later Louis-Charles Mahé de La Bourdonnais who won a famous series of matches with the Irish master Alexander McDonnell in 1834. Centers of chess life in this period were coffee houses in big European cities like Café de la Régence in Paris and Simpson's Divan in London.
As the nineteenth century progressed, chess organization developed quickly. Many chess clubs, chess books and chess journals appeared. There were correspondence matches between cities; for example the London Chess Club played against the Edinburgh Chess Club in 1824.Chess problems became a regular part of nineteenth century newspapers; Bernhard Horwitz, Josef Kling and Samuel Loyd composed some of the most influential problems. In 1843, von der Lasa published his and Bilguer's Handbuch des Schachspiels (Handbook of Chess), the first comprehensive manual of chess theory.
 Modern competition-style chess
Competitive chess became visible in 1834, and the 1851 London Chess tournament raised concerns about the time taken by the players to deliberate their moves. On recording time it was found that players often took hours to analyze moves, and one player took as much as two hours and 20 minutes to think over a single move at the London tournament. The following years saw the development of speed chess, five-minute chess and the most popular variant, a version allowing a bank of time to each player in which to play a previously agreed number of moves, e.g. two hours for 30 moves. In the final variant, the player who made the predetermined number of moves in the agreed time received additional time budget for his next moves. Penalties for exceeding a time limit came in form of fines and forfeiture. Since fines were easy to bear for professional players, forfeiture became the only effective penalty; this added "lost on time" to the traditional means of losing such as checkmate and resigning.
In 1861 the first time limits, using sandglasses, were employed in a tournament match at Bristol, England. The sandglasses were later replaced by pendulums. Modern clocks, consisting of two parallel timers with a small button for a player to press after completing a move, were later employed to aid the players. A tiny latch called a flag further helped settle arguments over players exceeding time limit at the turn of the 19th century.
A Russian composer, Vladimir Korolkov, authored a work entitled "Excelsior" in 1958 in which the White side wins only by making six consecutive captures by a pawn. Position analysis became particularly popular in the 19th century. Many leading players were also accomplished analysts, including Max Euwe, Mikhail Botvinnik, Vasily Smyslov and Jan Timman. Digital clocks appeared in the 1980s.
Another problem that arose in competitive chess was when adjourning a game for a meal break or overnight. If the players are X and Y, and X moved last before the adjournment, this would make it much easier for Y than for X to analyze the game during the adjournment. Preventing access to a chess set to work out moves during the adjournment in his hotel room or wherever would not stop him from analyzing the position in his head. Various strange ideas were attempted, but the eventual solution was the "sealed move": X, last thing before the adjournment, does not make his move but writes it on a piece of paper which he hands to a referee, who after the adjournment makes the move, and X and Y then continue the game.
 Birth of a sport (1850–1945)
The first modern chess tournament was held in London in 1851 and won, surprisingly, by German Adolf Anderssen, relatively unknown at the time. Anderssen was hailed as the leading chess master and his brilliant, energetic attacking style became typical for the time, although it was later regarded as strategically shallow. Sparkling games like Anderssen's Immortal game or Morphy's Opera game were regarded as the highest possible summit of the chess art.
Deeper insight into the nature of chess came with two younger players. American Paul Morphy, an extraordinary chess prodigy, won against all important competitors, including Anderssen, during his short chess career between 1857 and 1863. Morphy's success stemmed from a combination of brilliant attacks and sound strategy; he intuitively knew how to prepare attacks.Prague-born Wilhelm Steinitz later described how to avoid weaknesses in one's own position and how to create and exploit such weaknesses in the opponent's position. In addition to his theoretical achievements, Steinitz founded an important tradition: his triumph over the leading German master Johannes Zukertort in 1886 is regarded as the first official World Chess Championship. Steinitz lost his crown in 1894 to a much younger German mathematician Emanuel Lasker, who maintained this title for 27 years, the longest tenure of all World Champions.
It took a prodigy from Cuba, José Raúl Capablanca (World champion 1921–27), who loved simple positions and endgames, to end the German-speaking dominance in chess; he was undefeated in tournament play for eight years until 1924. His successor was Russian-French Alexander Alekhine, a strong attacking player, who died as the World champion in 1946, having briefly lost the title to Dutch player Max Euwe in 1935 and regaining it two years later.
Between the world wars, chess was revolutionized by the new theoretical school of so-called hypermodernists like Aron Nimzowitsch and Richard Réti. They advocated controlling the center of the board with distant pieces rather than with pawns, inviting opponents to occupy the center with pawns which become objects of attack.
Since the end of 19th century, the number of annually held master tournaments and matches quickly grew. Some sources state that in 1914 the title of chess grandmaster was first formally conferred by Tsar Nicholas II of Russia to Lasker, Capablanca, Alekhine, Tarrasch and Marshall, but this is a disputed claim. The tradition of awarding such titles was continued by the World Chess Federation (FIDE), founded in 1924 in Paris. In 1927, Women's World Chess Championship was established; the first to hold it was Czech-English master Vera Menchik.
 Post-war era (1945 and later)
After the death of Alekhine, a new World Champion was sought in a tournament of elite players ruled by FIDE, who have controlled the title since then, with one interruption. The winner of the 1948 tournament, Russian Mikhail Botvinnik, started an era of Soviet dominance in the chess world. Until the end of the Soviet Union, there was only one non-Soviet champion, American Bobby Fischer (champion 1972–1975).
In the previous informal system, the World Champion decided which challenger he would play for the title and the challenger was forced to seek sponsors for the match. FIDE set up a new system of qualifying tournaments and matches. The world's strongest players were seeded into "Interzonal tournaments", where they were joined by players who had qualified from "Zonal tournaments". The leading finishers in these Interzonals would go on the "Candidates" stage, which was initially a tournament, later a series of knock-out matches. The winner of the Candidates would then play the reigning champion for the title. A champion defeated in a match had a right to play a rematch a year later. This system worked on a three-year cycle.
Botvinnik participated in championship matches over a period of fifteen years. He won the world championship tournament in 1948 and retained the title in tied matches in 1951 and 1954. In 1957, he lost to Vasily Smyslov, but regained the title in a rematch in 1958. In 1960, he lost the title to the Latvian prodigy Mikhail Tal, an accomplished tactician and attacking player. Botvinnik again regained the title in a rematch in 1961.
Following the 1961 event, FIDE abolished the automatic right of a deposed champion to a rematch, and the next champion, Armenian Tigran Petrosian, a genius of defense and strong positional player, was able to hold the title for two cycles, 1963–1969. His successor, Boris Spassky from Russia (1969–1972), was a player able to win in both positional and sharp tactical style.
The next championship, the so-called Match of the Century, saw the first non-Soviet challenger since World War II, American Bobby Fischer, who defeated his Candidates opponents by unheard-of margins and clearly won the world championship match. In 1975, however, Fischer refused to defend his title against Soviet Anatoly Karpov when FIDE refused to meet his demands, and Karpov obtained the title by default. Karpov defended his title twice against Viktor Korchnoi and dominated the 1970s and early 1980s with a string of tournament successes.
Karpov's reign finally ended in 1985 at the hands of another Russian player, Garry Kasparov. Kasparov and Karpov contested five world title matches between 1984 and 1990; Karpov never won his title back.
In 1993, Garry Kasparov and Nigel Short broke with FIDE to organize their own match for the title and formed a competing Professional Chess Association (PCA). From then until 2006, there were two simultaneous World Champions and World Championships: the PCA or Classical champion extending the Steinitzian tradition in which the current champion plays a challenger in a series of many games; the other following FIDE's new format of many players competing in a tournament to determine the champion. Kasparov lost his Classical title in 2000 to Vladimir Kramnik of Russia.
Earlier in 1999, Kasparov as the reigning world champion played a game online against the world team composed of more than 50,000 participants from more than 75 countries. The moves of the world team were decided by plurality vote, and after 62 moves played over four months Kasparov won the game. The number of ideas, the complexity, and the contribution it has made to chess theory make it one of the most important chess game ever played.
The FIDE World Chess Championship 2006 reunified the titles, when Kramnik beat the FIDE World Champion Veselin Topalov and became the undisputed World Chess Champion. In September 2007, Viswanathan Anand became the next champion by winning a championship tournament. In October 2008, Anand retained his title, decisively winning the rematch against Kramnik