The Orthodox Variation, Bayonet Attack, Yepishin's Line is a variation of the King's Indian Defense, catalogued as ECO E97. The line runs 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. b4 Nh5 10. Qc2, reaching the position shown below after 19 half-moves.
Both sides have pawns in the centre (White on d5 and e4, Black on e5). Development is level at three minor pieces each. It is Black to move after ten moves. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.
On the King's Indian Defense generally: A hypermodern defense where Black allows White to build a big center, then counterattacks it.
You can play through this variation move by move in your browser — Learn mode walks the line with an explanation at each step, and Drill mode replays it from memory so you find out whether you actually know it. No account is required.
See all 112 King's Indian Defense variations →
The Orthodox Variation, Bayonet Attack, Yepishin's Line goes 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. b4 Nh5 10. Qc2. It is a variation of the King's Indian Defense and is catalogued as ECO E97.
The Orthodox Variation, Bayonet Attack, Yepishin's Line is ECO E97. ECO codes group openings by their move order, so nearby codes cover closely related lines of the King's Indian Defense.
Stockfish evaluates the position after 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. b4 Nh5 10. Qc2 at +0.32 at depth 18, which is a slight pull for White, within normal opening margins. Engine evaluation is only a starting point — at club level the practical value of a line is mostly about whether you know its plans better than your opponent does.
Both sides have pawns in the centre (White on d5 and e4, Black on e5). Development is level at three minor pieces each. It is Black to move. Both kings have castled kingside, so play tends to shift to the centre and the opposite flank.