Philidor Defense: what should White play?

In the Philidor Defense, White faces an immediate challenge against the central pawn on e5 and the pinned knight on f3. The optimal continuation is dxe5, resolving the tension in the center and securing an engine evaluation of +1.04. This choice represents the overwhelmingly favored continuation, played in 85.2% of recorded games (4.27M recorded) and yielding a 57.9% score for White.

The Strategic Value of dxe5

The central capture dxe5 immediately destabilizes Black's setup by forcing decisions regarding piece coordination and pawn structure. Black cannot comfortably relieve the pressure without making concessions, as White threatens to dismantle the center. An illustrative engine continuation demonstrates how play can simplify favorably for White: dxe5 Nc6 exd6 Qxd6 Qxd6 Bxd6. Following this queen exchange, White retains a clean structure and harmonious development while denying Black dynamic counterplay.

Developing Alternatives

While dxe5 commands the vast majority of master and practical practice, White can also prioritize piece development. The move Be3 appears in 1.7% of games (87K recorded), carrying a +1.01 evaluation and a 56.8% score, often continuing with Be3 Nd7 Nc3 Be7 Qd2 Bh5. Similarly, Nc3 is chosen in 1.6% of games (80K recorded) with an evaluation of +0.99 and a 53.3% score, leading into Nc3 Nd7 Be3 Be7 Qd2 Bh5. Both options maintain a solid central presence while leaving the tension intact.

Probing the Pin with h3

Another frequent human try is h3, which accounts for 11.0% of recorded games (552K recorded). This move asks the bishop on g4 its intentions immediately, generating a +0.92 evaluation and a 50.9% score for White. A typical sequence runs h3 Bxf3 gxf3 Nf6 Nc3 Nc6, where White accepts doubled pawns in exchange for the bishop pair and open lines. Alternatively, Qd3 features in 0.5% of games (23K recorded) with an evaluation of +0.95 and a line such as Qd3 a6 Nc3 Bxf3 gxf3 Nc6.