The 2025 Weissenhaus Freestyle Chess Grand Slam features a unique format randomizes the starting positions of the back-rank pieces, reducing the impact of memorized opening theory. First there will be round robin mini tournament for seeding (where 4 players are eliminated) and then a single elimination bracket will be played in the classical time control (2 classical matches + tiebreaks).

Previous tournament was won by Vincent Keymer.

Event info: https://www.chess.com/events/info/2025-freestyle-chess-grand-slam-paris