| Abbreviation | Definition |
|---|---|
| 00 | Castling Kingside |
| 000 | Castling Queenside |
| AACA | All Assam Chess Association |
| ACC | Arizona Chess Central |
| ACFI | Arizona Chess Federation, Inc. |
| AFC | Americas Foundation for Chess |
| AFICS | American Free Internet Chess Server |
| AGM | Arena Grand Master |
| AICE | Artificially Intelligent Chess Engine |
| AICF | All India Chess Federation |
| AICS | American Internet Chess Server |
| ALAC | Almighty Loser At Chess |
| AOA | All Other Activities |
| AOCA | All Odisha Chess Association |
| APCA | Andhra Pradesh Chess Association |
| ASCA | Arkansas Scholastic Chess Association |
| ASPCC | All Service Postal Chess Club |
| ATCA | All Tripura Chess Association |
| B | Bishop |
| BBI | Black Bishop |