Category:Chess openings

Wikimedia Commons has media related to Chess openings.

Wikibooks has a book on the topic of: Opening theory in chess

The most important scheme of classifying opening moves in chess for serious chess players is by ECO code, a series of 500 opening codes assigned by the Encyclopaedia of Chess Openings.

A simple descriptive categorization of the chess opening is King's Pawn Openings, Queen's Pawn Openings, and Others. Since these categories are still individually very large, it is common to divide them further. One reasonable way to group the openings is

• Double King Pawn or Open Games (1.e4 e5)
• Single King Pawn or Semi-Open Games (1.e4 other)
• Double Queen Pawn or Closed Games (1.d4 d5)
• Single Queen Pawn or Semi-Closed Games (1.d4 other)
• Flank openings (including 1.c4, 1.Nf3, 1.f4, and others)
• Irregular chess openings

The Indian systems (1.d4 Nf6) are the most important of the Semi-Closed Games, and warrant separate treatment.