There are a few offbeat openings that Black can choose apart from 2… e6 (Lines 170-285), 2… g6 (Lines 123-169) and 2… c5 (Lines 116-122), and they are examined in this opening line. Move 2… c6 most frequently transposes to the Slav Defense, after 3. Nc3 d5 or 3. Nf3 d5, so the main focus of this line are the Old Indian Defense (2… d6) and the Budapest Gambit (2… e5).
The Old Indian resembles the King’s Indian, but the fact that the Knight on d7 and the Bishop on e7 are not as active as in the King’s Indian, gives White freedom to seize the center. After 2… d6 3. Nf3 Nbd7 4. Nc3 e5 5. e4 Be7 6. Be2 c6 7. O-O O-O White holds a stable advantage both with 8. Qc2 and 8. Be3.
The Budapest Gambit, though interesting and unconventional, doesn’t give Black equal play. After 2… e5 3. dxe5 Ng4, the most promising move is 4. Bf4. Black should avoid 4… g5 in view of 5. Bg3 Nc6 6. Nf3 Bg7 7. h4 and he gets in serious trouble. He should play 4… Nc6 5. Nf3 Bb4+ instead, though here White also obtains an edge both after 6. Nc3 and 6. Nbd2.
[Diagram: Black to Move] White would be glad to trade off the Queens, but Black has other plans; Qh3 is not possible because the Rook on e8 is hanging, so how can Black launch an almost decisive attack?
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