Anderssen's Opening
ECO A00
Move order
1. a3
Ideas
ECO A covers irregular and flank openings—systems that skip the main e4/d4 fight early. White makes a useful waiting move on the queenside before committing the center. This entry names the opening after the first moves. Use the diagram and SAN list to recognize the tabiya, then try the line against Maia to explore typical plans in practice.