Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...f5/4. d3

Ruy Lopez, Schliemann Defence

Common moves:
4...fxe4 - only move

The move 4.d3 defended e4 but also threatened to snaffle the f5-pawn into the bargain, because now Black won't have the instant rejoinder ...e4.

4...fxe4 is the only move to justify the Black pawn thrust.

Wikipedia has related information at Ruy Lopez

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Chess openings quick reference

1. e4

2. Nf3

With 2...Nc6:

With other 2nd moves:

2. Other

With 2...Nc6:

With 2...d6:

With 2...e6:

With other 2nd moves:

Anti-Sicilians

1... other

Other

1. d4

2. other

2. c4

With 2...e6:

With 2...g6:

With other 2nd moves for Black:

2. Nf3

2. other

1... other

Flank

Unorthodox