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The King's Knight Opening is a chess opening consisting of the moves:

1. e4 e5

2. Nf3

By far the most played continuation is the King's Pawn Game 2...Nc6, and it is sub-divided into many familiar opening names like Ruy Lopez. Petrov's Defense, 2...Nf6, and the Philidor Defense, 2...d6, are also familiar opening names.

Some less familiar continuations of the King's Knight Opening include:

• Gunderam Defense 2...Qe7
• Greco Defense 2...Qf6
• Damiano Defense 2...f6
• Elephant Gambit 2...d5
• Latvian Gambit 2...f5

These openings are all categorized under the ECO code C40.