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A91 Road
A91 or A-91 may refer to: * A91 road, a trunk road in Scotland * Dutch Defence, in the Encyclopaedia of Chess Openings * A-91, a Soviet bull-pup assault rifle, derived from the 9A-91 carbine {{Letter-NumberCombDisambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dutch Defence
The Dutch Defence is a chess opening characterised by the moves: : 1. d4 f5 Black's 1...f5 stakes a claim to the e4-square and envisions an attack in the middlegame on White's ; however, it also weakens Black's kingside to some extent, especially on the e8–h5 diagonal. Like its 1.e4 counterpart, the Sicilian Defence, the Dutch is an aggressive and unbalancing opening, resulting in the lowest percentage of draws among the most common replies to 1.d4. Historically, White has tried many methods to exploit the kingside weaknesses, such as the Staunton Gambit (2.e4) and Korchnoi Attack (2.h3 and 3.g4). The Dutch has never been a main line against 1.d4 and is rarely seen today in high-level competition, although a number of top players, including Alexander Alekhine, Bent Larsen, Paul Morphy, Miguel Najdorf, Simon Williams, and Hikaru Nakamura have used it with success. Its most notable use may have been in 1951, when both World Champion Mikhail Botvinnik and his challen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
A-91
The A-91 is a Russian bullpup assault rifle developed by the KBP Instrument Design Bureau during the 1990s. It is an evolution of the earlier 9A-91 carbine, primarily designed to be compact, reliable, and versatile in urban combat scenarios. The rifle is notable for its integrated 40mm grenade launcher and the use of a bullpup configuration, which positions the magazine behind the trigger, allowing for a more compact design without sacrificing barrel length. Design and Features The A-91 uses a gas-operated system with a rotating bolt, similar to the AK-47 and other Kalashnikov designs. However, unlike most Russian rifles, it adopts a bullpup layout, which reduces the overall length while maintaining a full-length barrel, improving handling in confined spaces. The rifle can be chambered in multiple calibers, including the standard Russian 5.45×39mm and 7.62×39mm rounds, as well as the NATO- standard 5.56×45mm NATO cartridge. Its rate of fire is approximately 600 ro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |