King's Knight Opening: Normal Variation: what to play after Nc6?

In the King's Knight Opening: Normal Variation (ECO C44), White's top engine recommendation is Bb5, which scores an evaluation of +0.22. By playing Bb5, White enters the Ruy Lopez, putting indirect pressure on Black's pawn on e5 by challenging the c6 defender. With over 240 million recorded games reaching this position, White can choose between several major classical systems depending on tactical preferences and strategic aims.

Popular Alternatives to the Ruy Lopez

While Bb5 is the engine's primary choice and appears in 25.3% of database encounters (61M recorded), other major paths exist. The Italian Game with Bc4 is the most frequent continuation, selected in 40.4% of games (97M recorded) with a +0.14 engine evaluation. The Scotch Game via d4 is played in 17.4% of games (42M recorded) and evaluates at +0.08, opening lines in the center immediately. Additionally, the Three Knights Game via Nc3 claims a 10.5% share (25M recorded) with an evaluation of +0.16.

Strategic Ideas in the Main Lines

The Spanish branch continues along classical lines in the engine demonstration Bb5 Nf6 O-O Nxe4 Re1 Nd6, where White accepts Black's knight sortie to rapidly open the e-file against the uncastled king. By contrast, the Italian pathway Bc4 Nf6 Ng5 d5 exd5 Na5 directs piece activity directly against the vulnerable f7 square. Those opting for d4 aim to dissolve Black's central presence immediately, as seen in the sequence d4 exd4 Nxd4 Nf6 Nc3 Bb4.

Passive Options

Quiet moves such as h3 evaluate at an even +0.00 and offer White no developmental edge. The illustrative engine line h3 Nf6 Nc3 Bb4 Nd5 Nxd5 allows Black comfortable piece activity. The main developmental options Bb5, Bc4, d4, and Nc3 consistently maintain superior practical value.