Grandmaster is the highest title a chess player can attain, out of the millions of players around the world, there are currently only 1,721 Grandmasters.
The title is bestowed by the World Chess Federation (FIDE) and is generally held for life, though it can be revoked for serious infractions, such as cheating.
While most Grandmasters are men, women are also eligible for the title and most of the highest-ranking female chess players are Grandmasters.
To become a Grandmaster, players have to reach an Elo rating of 2,500 and win three norm tournaments.
Norm tournaments are elite competitions featuring at least three Grandmasters from different countries.
They have nine rounds and a time control of at least 120 minutes.
The Elo rating is a method for calculating the skill levels of players in a zero-sum game like chess.
A player's rating is determined by wins, losses and draws against other players. It is also impacted by the ratings of their opponents and the results scored against them.
To be in with a chance of becoming a Grandmaster, chess enthusiasts are advised to start learning the game from a young age, put in hours of practice and compete in tournaments.
Five of the greatest Grandmasters
Just who deserves the title of the greatest chess player of all time is a subject of endless debate among enthusiasts.
However, the names below are never far from the top of any list of the all-time greats.
Here are five GMs to know:
1. Magnus Carlsen (Norway)
Magnus Carlsen has been the reigning World Chess Champion since 2013 and is currently the best chess player in the world.
Some consider him the best of all time, having secured an Elo rating of 2,882 - the highest in the history of chess - in 2014, though he believes that honour still belongs to Garry Kasparov.
Carlsen excels in a number of areas and appears to have no weaknesses.
As of February 2020,
