Definition of grandmasters:
(n) :
(chess) A player of the highest rank, as determined by FIDE, with an Elo rating of at least 2500.
(n) :
A master in a field, whose skills or accomplishments exceed those of other masters.
(n) :
(chess, historical) Ellipsis of Grandmaster of the Soviet Union; USSR champion.
(n) :
Alternative spelling of Grandmaster. [(chess) A player of the highest rank, as determined by FIDE, with an Elo rating of at least 2500.]