Philidor Defense: what to play after d4?

In the Philidor Defense (ECO C41), Black faces White's immediate central challenge against the pawn on e5. The standard and most reliable response is exd4, which resolves the central tension and yields an engine evaluation of +0.59. Black chooses this continuation in 50.8% of recorded games (2.02M recorded) out of nearly four million encounters from this position.

Central Clarification with exd4

By playing exd4, Black avoids tactical complications along the d-file and opens lines for rapid piece development. The illustrative engine line continues exd4 Nxd4 Nf6 Nc3 Nc6 Bf4, where White regains the pawn immediately but Black gains time to bring out the minor pieces. Although White secures a slight spatial plus, this exchange eliminates White's option to increase pressure on e5 or establish a space-clamping pawn on d5.

Counterattacking with Nf6

The most direct alternative is the counterattack Nf6, chosen in 4.3% of games (171K recorded) with an evaluation of +0.60. Instead of ceding the center immediately, Black attacks e4, leading to concrete lines such as Nf6 dxe5 Nxe4 Qd5 Nc5 Bg5. This approach requires precise tactical handling, as White's queen and minor pieces actively contest the center and gain tempo against Black's centralized knight.

Alternative Setups

Black can also opt for solid development with Nd7, appearing in 4.1% of games (163K recorded) with an evaluation of +0.69, leading into Nd7 c4 g6 Nc3 Ngf6 Be2. Other options include Nc6 (+0.82; 9.6% of games; 379K recorded), which invites Nc6 d5 Nb8 Be3 Nf6 Bd3, and Qe7 (+0.99; 2.4% of games; 95K recorded) leading to Qe7 Be3 Nf6 Nc3 g6 dxe5.