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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 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 Sokolsky Opening, also known as the Orangutan and the Polish Opening, is an uncommon chess opening that begins with the move: . 1. b4. According to various databases, out of the twenty possible first moves from White, the move 1.b4 ranks ninth in popularity. [1]
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]
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.
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 Blumenfeld Countergambit is a chess opening characterised by the moves 3...e6 4.Nf3 b5 in the Benoni Defense arising after: 1. d4 Nf6 2. c4 c5 3. d5 e6 4. Nf3 b5. or alternatively: 1. d4 Nf6 2. c4 e6 3. Nf3 c5 4. d5 b5. In fact, as many as 30 different move orders are possible. [1]
During the 2010's, the hitherto forgotten line 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Nc3 c5 5.cxd5 exd5 6.g3 Nc6 7.Bg2 cxd4 8.Nxd4 Bc5 became a topic of theoretical debate at the top level mainly due to the efforts of Russian grandmaster Daniil Dubov. This approach to the Tarrasch Defense is therefore known as the Dubov Tarrasch.