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a b c d e f g h
8 a8 rd b8 nd c8 bd d8 qd e8 kd f8 bd g8 nd h8 rd 8
7 a7 pd b7 pd c7 pd d7 pd e7 f7 pd g7 pd h7 pd 7
6 a6   b6   c6   d6   e6   f6 g6   h6   6
5 a5   b5   c5   d5   e5 pd f5   g5   h5   5
4 a4   b4   c4   d4 e4 pl f4   g4   h4   4
3 a3   b3   c3   d3   e3   f3 nl g3   h3   3
2 a2 pl b2 pl c2 pl d2 pl e2 f2 pl g2 pl h2 pl 2
1 a1 rl b1 nl c1 bl d1 ql e1 kl f1 bl g1 h1 rl 1
a b c d e f g h
King's Knight Opening

The King's Knight Opening is by far the most common response to the Open Game. It is characterised by the moves:

  1. e4 e5
  2. Nf3

It compromises ECO codes C40-C99.


ECO Codes[]

ECO Code C40 contains all irregular Open Games. Specifically, it includes every response from black apart from:

The noteworthy openings in C40 are:


For a list of all other ECO Codes, see List of chess openings.


Sources[]

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