In chess, an irregular opening is an opening considered unusual or unorthodox. In the early 19th century the term was used for any opening not beginning with 1.e4 e5 or 1.d4 d5. As opening theory has developed and openings formerly considered "irregular" have become standard, the term has been used less frequently.
Grob's Attack is an unconventional chess opening in which White begins with the move:
The Réti Opening is a hypermodern chess opening whose "traditional" or "classic method" begins with the moves:
The Amar Opening is a chess opening defined by the move:
The Clemenz Opening is a chess opening beginning with the move:
The Mieses Opening is a chess opening that begins with the move:
The Saragossa Opening is a chess opening defined by the opening move:
The Dunst Opening is a chess opening in which White opens with the move:
The Barnes Opening is a chess opening where White opens with:
The Ware Opening, also known as Meadow Hay Opening, is an uncommon chess opening for White beginning with the move:
The King's Pawn Game is any chess opening starting with the move:
The Keres Defence is a chess opening characterised by the moves:
The Desprez Opening is a chess opening characterised by the opening move:
The Danvers Opening is an unorthodox chess opening characterized by the moves:
A flank opening is a chess opening played by White and typified by play on one or both flanks. White often plays in hypermodern style, attacking the center from the flanks with pieces rather than occupying it with pawns. Some of these openings are played often, although more often by advanced players than beginners, and 1.Nf3 and 1.c4 trail only 1.e4 and 1.d4 in popularity as opening moves.
Angus Dunnington is an English poker and online gambling specialist and former professional chess player with the title of International Master (IM). Dunnington is most known for his extensive work in chess opening theory, as well as the psychological aspects of both chess and poker. He stopped playing competitive chess in 2003 in order to spend more time writing, has been a recipient of a Chess Journalists of America award, penned over 1,000 articles and is the author of over 20 books, subjects including chess psychology, unorthodox chess openings and online gambling.
The King's Fianchetto Opening or Benko's Opening is a chess opening characterized by the move:
Rotlewi versus Rubinstein is a game of chess played between Gersz Rotlewi and Akiba Rubinstein in Łódź, Poland on December 26, 1907. It features a brilliant queen and rook sacrifice by Rubinstein to force mate.
The Semi-Italian Opening is one of Black's responses to the Italian Game. It begins with the moves:
In chess, the Katalymov Variation is a less popular line of the Sicilian Defence that begins with the moves:
