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The Old Indian Defense is a chess opening defined by the moves: :1. d4 Nf6 :2. c4 d6 This opening is distinguished from the King's Indian Defense by Black developing his king's bishop on e7 rather than the fianchetto at g7. Mikhail Chigorin pioneered this defense late in his career. 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 opening is classified in the ''Encyclopaedia of Chess Openings'' (ECO) with the codes A53–A55. == Main line: 3.Nc3 e5== 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 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 his piece coordination is good; White's pawn exchange in the center has allowed Black equal space and freed the f8-bishop. 5... Be7 6. Be2 0-0 7. 0-0 c6 8. Re1 (or 8.Be3) and White stands slightly better. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Old Indian Defense」の詳細全文を読む スポンサード リンク
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