Irregular chess opening

Irregular openings are chess openings with an unusual or rare first move by White. These openings are:

The above openings are all categorized under the ECO code A00. Openings that are not "irregular" comprise:

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 Game).

See also

References

Because these openings are not popular with chess players, the standard opening references (see chess opening and Chess theory#Opening theory) do not cover them in detail.

External links

Wikibooks has a book on the topic of: Chess Opening Theory