Grandmaster (noun)

1. A chess player of the highest rank, awarded by the World Chess Federation.
2. A player who has achieved a high level of skill in a game or activity.

Origin:

Late 19th century: from grand (from french grand) + master.

Examples:

1. He was a grandmaster in chess.
2. The grandmaster was able to defeat all the other players.
3. He became a grandmaster at the age of 15.
4. The grandmaster was the highest-ranked player in the tournament.
5. The grandmaster was considered the best player in the world.