Irregular openings (chess)

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Irregular openings are chess openings with an unusual first move from White. Such openings include:

Anderssen's Opening 1.a3
Amar Opening (also known as Paris Opening) 1.Nh3
Barnes Opening (also known as Gedult's Opening) 1.f3
Benko's Opening 1.g3
Clemenz Opening 1.h3
Desprez Opening 1.h4
Dunst Opening 1.Nc3
Durkin Opening (also known as Durkin's Attack) 1.Na3
Grob's Attack 1.g4
Mieses Opening 1.d3
Saragossa Opening 1.c3
Sokolsky Opening (also known as Polish or Orangutan Opening) 1.b4
Van 't Kruijs Opening 1.e3
Ware Opening 1.a4

These openings are all categorized under the ECO code A00. The only other possible openings are 1.e4 (King's Pawn Game), 1.d4 (Queen's Pawn Game), 1.c4 (English Opening), 1.Nf3 (Réti Opening), 1.f4 (Bird's Opening), and 1.b3 (Larsen's Opening). Note that if White plays a regular opening and Black responds in an unconventional way, the opening is not categorized A00. For instance, 1.e4 a6 is classified as B00 (King's Pawn Opening).

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