format usually refers to third-party compressed archives containing: CBV (ChessBase Archive Format)
The most critical part of this release note is . The 7z archive contains two distinct sub-archives: Chess Megabase 2025 Updates 1 11 -both Formats- 7z
The "Updates 1-11" likely refer to the initial weekly batches of the Mega Update Service 2025 , which provides approximately 5,000 new games per week Overview of Mega Database 2025 Total Content which provides approximately 5