The 2021 Croatia Grand Chess Tour Rapid and Blitz tournament will be the second Rapid and Blitz event and the third stop on the 2021 Grand Chess Tour.
In 2019, Croatia Grand Chess Tour featured all 12 tour participants competing in classical format while this year's 2021 event will feature ten elite grandmasters competing over 9 rounds of rapid chess and 18 rounds of blitz chess.
The rapid is a 10-player single round-robin with 3 rounds each day on the first 3 days at a time control of 25 minutes for all moves and a 10-second increment from move 1.
The final 2 days are a blitz double round-robin, with 18 rounds of 5+2 blitz. Rapid games count double, with 2 points for a win and 1 for a draw.