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Larsen's Opening (also called the Queen's Fianchetto Opening) is a chess opening starting with the move: :1. b3 It is named after the Danish grandmaster Bent Larsen. Larsen was inspired by the example of the great Latvian-Danish player and theoretician Aron Nimzowitsch (1886–1935), who often played 1.Nf3 followed by 2.b3, which is sometimes called the Nimzowitsch–Larsen Attack. It is classified under the A01 code in the ''Encyclopaedia of Chess Openings''. The flank opening move 1.b3 prepares to fianchetto the queen's bishop where it will help control the central squares in hypermodern fashion and put useful pressure on Black's kingside. The b2-bishop is often a source of recurring irritation for Black, who should not treat it lightly. Although Bent Larsen was initially very successful with this opening, it suffered a setback in the 1970 USSR vs. Rest of the World match in Belgrade, in which Larsen played this opening against reigning World Champion Boris Spassky and lost in 17 moves.〔(Larsen–Spassky 1970 )〕 (Of the 42 games between Spassky and Larsen, Spassky won overall with 19 wins, 6 losses, and 17 draws.)〔http://www.chessgames.com/perl/chess.pl?page=1&pid=21136&pid2=11227&eresult=〕 Larsen was also decisively defeated when playing this opening against Rosendo Balinas, Jr. at Manila in 1975.〔(Larsen–Balinas 1975 )〕 Notably, the opening received interest from Bobby Fischer the same year, who employed 1.b3 on at least five occasions, winning all five, including games with GMs Filip and Mecking (Palma de Mallorca 1970 Interzonal), GM Tukmakov (Buenos Aires 1970), and GM Andersson (Siegen 1970). == Popularity == The move 1.b3 is less popular than 1.g3 (Benko's Opening), which prepares a quick kingside castling. According to ChessBase, 1.b3 ranks sixth in popularity out of the possible twenty first moves while the fifth-ranking 1.g3 is about three times as popular. Larsen frequently used unconventional openings of this sort. He believed it to be an advantage in that Black, usually unfamiliar with such openings, is forced to rely on his own abilities instead of relying on memorized, well-analyzed moves of more common White openings. The relative unpopularity of 1.b3 compared to 1.g3, is probably because with 2.Bg2, the move c4 is often played later to strengthen the fianchettoed bishop's diagonal; whereas if f4 is played to strengthen the bishop's diagonal after 1.b3 and 2.Bb2, it weakens the kingside—the usual destination for White's king when castling. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Larsen's Opening」の詳細全文を読む スポンサード リンク
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