The Old Indian is considered sound, though developing the bishop at e7 is less active than the fianchetto, and it has never attained the popularity of the King's Indian. Some King's Indian players will use the Old Indian to avoid certain anti-King's Indian systems, such as the Sämisch and Averbakh Variations.
The Main line is 3.Nc3 e5 4.Nf3 Nbd7 5.e4; White can also play 4.dxe5 dxe5 5.Qxd8+, but despite the displacement of Black's king, this has long been known[by whom?] to offer no advantage, e.g. 5...Kxd8 6.Nf3 Nfd7!, with Black often following up with some combination of ...c6, ...Kd8–c7, ...a5, ...Na6, and ...f6. Black's position is solid and their piece coordination is good; White's pawn exchange in the center has allowed Black equal space and freed the f8-bishop. After 5...Be7 6.Be2 0-0 7.0-0 c6 8.Re1 (or 8.Be3), White stands slightly better.
Janowski Variation: 3.Nc3 Bf5
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Janowski Variation: 3.Nc3 Bf5
The Janowski Variation, 3.Nc3 Bf5, was first introduced by Dawid Janowski in the 1920s. The idea behind it is that 3...Bf5 prevents White from immediately grabbing space with 4.e4. The variation did not gain much popularity until the 1980s. Several top-level players have employed the line multiple times, including Mikhail Tal, Bent Larsen, Florin Gheorghiu, and Kamran Shirazi.
The Pirc Defence is a chess opening characterised by the response of Black to 1.e4 with 1...d6 and 2...Nf6, followed by ...g6 and ...Bg7, while allowing White to establish a centre with pawns on d4 and e4. It is named after the Slovenian grandmaster Vasja Pirc.
The King's Indian Defence is a common chess opening. It is defined by the following moves:
The Bogo-Indian Defense is a chess opening characterised by the moves:
The Queen's Indian Defense (QID) is a chess opening defined by the moves:
The English Opening is a chess opening that begins with the move:
The Philidor Defence is a chess opening characterised by the moves:
Bird's Opening is a chess opening characterised by the move:
The Alekhine's Defence is a chess opening that begins with the moves:
The Caro–Kann Defence is a chess opening characterised by the moves:
The Catalan Opening is a chess opening where White plays d4 and c4 and fianchettoes the white bishop on g2. A common opening sequence is 1.d4 Nf6 2.c4 e6 3.g3, although various other openings can transpose into the Catalan. The Encyclopaedia of Chess Openings lists codes E01–E09 for lines with 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2; other lines are part of E00.
The Modern Benoni is a chess opening that begins with the moves 1.d4Nf6 2.c4c5 3.d5e6. 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. To support their advance, the king's bishop is usually fianchettoed on g7. These two features differentiate Black's setup from the other Benoni defences and the King's Indian Defence, although transpositions between these openings are common.
Larsen's Opening is a chess opening starting with the move:
The Slav Defense is a chess opening that begins with the moves:
The Queen's Gambit Declined is a chess opening in which Black declines a pawn offered by White in the Queen's Gambit:
In the game of chess, Indian Defence or Indian Game is a broad term for a group of openings characterised by the moves:
The London System is an opening system in chess where White opens with 1.d4 but does not play the Queen's Gambit, instead opting to rapidly develop the dark-squared bishop. This often results in a closed game. The London System can be used against virtually any Black defense and thus comprises a smaller body of opening theory than many other openings. Although it has a reputation as a solid opening, the London System has faced criticism for its lack of dynamic play.
The East Indian Defence is a chess opening characterised by the moves:
The King's Fianchetto Opening or Benko's Opening is a chess opening characterized by the move:
The Van 't Kruijs Opening is a chess opening defined by the move:
The Scandinavian Defense is a chess opening characterized by the moves:
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