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The Benoni Defense, or simply the Benoni, is a chess opening characterized by an early reply of ...c5 against White's opening move 1.d4.. The original form of the Benoni, now known as the Old Benoni, is characterized by
The natural development of the bishops to b7 and d6, combined with the half-open f-file for a rook, tend to facilitate Black's play on the kingside. White, on the other hand, will typically look to counter in the centre by playing e4 at some point, while their additional queenside pawn also offers them some initiative on that side of the board.
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.
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.
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.
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 Tarrasch Defense is a chess opening characterized by the moves: 1. d4 d5 2. c4 e6 3. Nc3 c5. The Tarrasch is a variation of the Queen's Gambit Declined. Black's third move is an aggressive bid for central space. After White plays cxd5 and dxc5, Black will be left with an isolated pawn on d5.
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]
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