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Philidor Defense: Nimzowitsch Variation is a chess opening that arises after 1.e4 e5 2.Nf3 d6 3.d4 Nf6. It is classified C41 in the ECO system, and the position after these moves has white to move. The Philidor Defense supports the e5 pawn with d6, giving Black a very solid but cramped position. Named after François-André Danican Philidor, the eighteenth-century player who argued that pawns are the soul of chess.
This position can also be reached by another move order, including 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.dxe5.
Solid and passive. Black has few weaknesses but little space, and freeing moves must be timed carefully. The modern treatment reaches it via the Hanham setup with Nd7 and c6 rather than by the direct move order.
Players who prefer defending sound positions over seeking early complications, and who want minimal theory against 1.e4 e5 lines.
This line is a variation within the Philidor Defense family. The strategic ideas above describe the family as a whole; this particular line reaches them by the move order 1.e4 e5 2.Nf3 d6 3.d4 Nf6.
Each of these is a named opening reached by playing on from 1.e4 e5 2.Nf3 d6 3.d4 Nf6. Open any of them to load the position on the board.