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The Benko Gambit, also known as the Volga Gambit, begins 1.d4 Nf6 2.c4 c5 3.d5 b5. Play usually continues 4.cxb5 a6 5.bxa6 Bxa6. Black sacrifices a pawn for open lines and long-term positional pressure on the queen's side.
The Modern Benoni is a chess opening that begins with the moves 1.d4 Nf6 2.c4 c5 3.d5 e6.It is classified under the ECO codes A60–A79. After the initial moves, Black proceeds to capture on d5, creating a majority of black pawns on the queenside.
The Modern Defense (also known as the Robatsch Defence after Karl Robatsch) is a hypermodern chess opening in which Black allows White to occupy the center with pawns on d4 and e4, then proceeds to attack and undermine this "ideal" center without attempting to occupy it. The Modern Defense usually starts with the opening moves: 1. e4 g6
The same position can be reached by transposition from a Queen's Pawn Game after 1.d4 e6 2.e4 d5 or the declining of a Blackmar–Diemer Gambit after 1.d4 d5 2.e4 e6. White's options include defending the e4-pawn with 3.Nc3 or 3.Nd2, advancing it with 3.e5, or exchanging it with 3.exd5, each of which leads to different types of positions.
An alternative approach for White is 3.Bc4, delaying d2–d4, or forgoing it entirely, playing d2–d3 instead. The move 3.Bc4 is also White's route to a possible Légal Trap. Some continuations: 3...Nc6 transposes to the Semi-Italian Opening. [36] 3...f5 is the López Countergambit: [37] 4.d4 transposes to the Philidor Countergambit. [38]
It was not until early 2008 that an answer to Black was finally found. After 9.0-0 b4, White has the positional sacrifice 10.Nd5!, which gives Black long-term weaknesses and an open e-file for White to play on. Since then, it has been popular on all levels of play.
Symptoms “A B12 deficiency can cause physical and neurological symptoms, and research is also growing to support that it can also cause psychological issues as well,” says Shapiro.
The Nimzo-Indian Defence is a popular defence to 1.d4, and in this case White has obtained a version with colours reversed and an extra tempo. The notes above give the three typical branches of the Nimzowitsch-Larsen Attack: (1) playing against an e5/d5 centre, (2) allowing ...e5 but contesting ...d5 and (3) playing against a d5/c5 centre.