Orthodox Variation, Korchnoi Attack

The Korchnoi Attack is White's 9. Bd2 in the Mar del Plata main line of the King's Indian, an alternative to 9. Ne1, 9. Nd2 and 9. b4. The bishop develops quietly and leaves the f3-knight in place while White works toward the usual c4–c5 queenside break. Black typically reroutes the f6-knight to free the f-pawn for ...f5, most often with 9...Ne8, less often with 9...Nd7 or 9...Nh5. The line is rarely seen, and engines give White a slight edge.