While the second leg had 12 participants playing in the main event, the number of participants was increased to 16 for the fourth leg. However, while before only the top eight players after the round-robin stage qualified for the main knockout bracket, now all the remaining eight players would still play for positions 3-16 in a modified double-elimination style format.[2]
Another change to the format was the time control of the knockout stage, which was reduced from 90 minutes per player to 30, with an unchanged increment of 30 seconds. The change was made to have two games played on the same day and shorten the event's length. The round-robin and tiebreak games were unaffected.
All qualification matches were played online and were hosted by Chess.com. All non-titled players started qualification in one of two separate open qualifier events, which were held on June 14 and June 15 respectively, with the top three players from each event advancing to the Swiss stage.[3] 146 players participated in the Swiss stage held on June 18. It was open to all titled players. The top four players, Rasmus Svane, Denis Lazavik, Pranesh M, and Martyn Kravtsiv advanced to the 16-player knockout stage.[4]
Twelve players from the Freestyle Chess Players Club were invited directly to the knockout stage, held on June 19 and June 20. Hans Niemann defeated Denis Lazavik in the final, drawing with black pieces in the armageddon game, and qualified for the Grand Slam.
Note: The player listed first played as white in the first game of the match. Scores between two players adding up to 2 indicate a win under rapid time controls; adding up to 4, a win under blitz time controls; and adding up to 5, a win in armageddon with bidding.
Main event
Participants
Leading up to the later-to-be-called third leg of the Grand Slam Tour, the Grenke Freestyle Chess Open, the organizers of the Freestyle Tour and the Grenke Open announced to publish a world rating list for Freestyle based on the tournament results.[5]
In the their updated rules and regulations, Freestyle Chess increased the number of players in a Grand Slam to 16, and replaced the qualification path by FIDE rating with Freestyle rating.
The Round-robin stage was changed for the Las Vegas leg. Instead of one full round-robin including every player, the 16 players were broken up into two groups, "White" and "Black". Each player played every other in their respective groups, and the top four from each group advanced to the winners' bracket.
↑Magnus Carlsen won the Grenke Freestyle Open, but since he had already qualified, Maghsoodloo qualified as the runner-up. However, he couldn't play due to visa issues.[7]
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Levon Aronian 
Magnus Carlsen 
