Hypermodernism is a school of chess that emerged after World War I. It featured challenges to the chess ideas of central European masters, including Wilhelm Steinitz's approach to the and the rules established by Siegbert Tarrasch. Overview The Hypermodernists demonstrated their new ideas with games and victories. Aron Nimzowitsch, considered the founder and leading practitioner of hypermodernism, showed that games could be won through indirect control of the centre, breaking with Tarrasch's view that the centre must be occupied by pawns. Nimzowitsch advocated controlling the centre with distant pieces rather than with pawns, thus inviting the opponent to occupy the centre with pawns, which can then become targets of attack. This was part of the hypermodern framework, which Nimzowitsch encapsulated in his seminal book My System, which greatly influenced many chess players. It introduced and formalised concepts of the , , undermining, prophylaxis, restraint, rook on the seventh , knight outposts, the dynamics of the isolated queen's pawn, and other areas of chess. Although none of the primary exponents of the Hypermodern school ever achieved the title of World Chess Champion, they were among the world's strongest players. World Champion Alexander Alekhine was associated with hypermodernism, but his style was more of a blend with the Classical school. In practice, hypermodernism has not replaced the classical theory of Steinitz and Tarrasch. Instead, modern chess textbooks describe hypermodernism as an addition, or extension, to classical theory. Hypermodern openings include the Réti Opening, King's Indian Defence, Queen's Indian Defence, Nimzo-Indian Defence, Nimzowitsch Defence, Grünfeld Defence, Bogo-Indian Defence, Old Indian Defence, Catalan Opening, King's Indian Attack, Alekhine's Defence, Modern Defence, Pirc Defence, Larsen's Opening, and to a lesser degree the English Opening. Openings such as 1.a3 do not constitute hypermodern openings since, although they delay the occupation of the centre with pawns, they also delay piece . History Howard Staunton and many of his 19th-century contemporaries understood various ideas associated with hypermodernism. The Hypermodern school of chess theory came to prominence in the 1920s. Leading members were Aron Nimzowitsch, Richard Réti, Savielly Tartakower, Gyula Breyer, Efim Bogoljubov, and Ernst Grünfeld, who all came from Central Europe. They felt that chess was becoming boring, slow, and not worthwhile. They also believed that chess could not be defined by a simple set of laws or principles, such as those laid out by Siegbert Tarrasch. Their ideas were thus a challenge to the existing orthodoxy popularised