Italian Game: Two Knights Defense, Knight Attack: what should Black play?

In this critical position from the Italian Game: Two Knights Defense, Knight Attack, Black faces an immediate assault against f7 while the knight on c6 is under attack by the d-pawn. The standard and most reliable response for Black is Na5, which sidesteps the pawn capture and counterattacks the active bishop on c4. While White maintains a moderate advantage in computer evaluations (+1.34), Na5 remains the consensus primary defense to challenge White's early initiative.

The Principal Choice: 5...Na5

The move Na5 is by far the most established path, appearing in 70.2% of recorded games (80K recorded). Moving the knight attacks c4, preventing White from quietly maintaining both central pressure and the assault on f7. Against this, White achieves a 53.3% scoring rate. An illustrative engine continuation runs Na5 Bb5+ c6 dxc6 bxc6 Be2, where White retreats the bishop while retaining an extra pawn, leaving Black to seek dynamic compensation for the structural disruption on the queenside.

The Fritz Variation: 5...Nd4

The most common alternative is the ambitious central jump Nd4, chosen in 25.1% of games (29K recorded). While the engine evaluates this line slightly lower at +1.44, White scores 51.9% here, which is marginally lower than after the main line. Play frequently transitions into quieter maneuvering, demonstrated in the engine variation Nd4 d3 Bd6 O-O O-O a4, where White simply stabilizes the center with d3 while keeping the extra space.

Dubious Alternatives

Other departures struggle significantly under engine scrutiny and yield high scores for White. The counterattacking try Bg4 is seen in 1.9% of games (2.1K recorded), but engine evaluations surge to +2.46 as White scores 67.5% following Bg4 Nxf7 Bxd1 Nxd8 Bxc2 dxc6. Similarly, Nb4 (2.8% of games, +2.47 eval, 64.5% White score) runs into Nb4 d6 Be6 dxc7 Qxc7 Bxe6, while the retreat Nb8 yields an engine eval of +2.80 after Nb8 d6 Be6 Nxe6 fxe6 dxc7.