| Abbreviation | Definition |
|---|---|
| MVL | Maxime Vachier-Lagrave |
| N | Knight |
| NCFP | National Chess Federation of the Philippines |
| NDSO | Northern Dutchess Symphony Orchestra |
| NIC | New In Chess |
| NMR | No Moves Received |
| NOCA | North Omaha Chess Academy |
| NPPCH | Neighborhood Ping Pong & Chess House, East Cleveland, Ohio |
| NSCF | National Scholastic Chess Foundation |
| NSCL | North Suburban Chess League |
| NSSCA | Nova Scotia Scholastic Chess Association |
| NXB | Knight Takes Bishop |
| NXN | Knight Takes Knight ( Chess) |
| NXP | Knight Takes Pawn |
| NXQ | Knight Takes Queen |
| NXR | Knight Takes Rook |
| OCBCF | Optimist Coastal Bend Chess Federation |
| OCC | Osiris Chess Club, Homewood, Alabama |
| OCG | Official Chess Game |
| OCH | Olympic Chess House, Washington, DC |