The puzzle library
We have converted the complete Lichess puzzle database for AccelaStudy® AI Chess: 6,193,530 puzzles, checked and organized into packs you will be able to download in pieces.
Take a focused set, or take everything.
The library is converted and verified. Public availability has not been announced.
Measured on the November 2, 2026 snapshot. The expanded size is the puzzle data alone, so a device needs more room than that to hold everything once indexes are added.
Choose your download
Downloading the whole library is optional.
Pick the ideas you want to practice, such as back-rank mates, forks, or rook endgames. Choosing by theme is the plan.
Narrow the library to a range of puzzle difficulty. That number rates the puzzle, not you, and it is never turned into a rating for how you play. The development iOS client already filters by rating.
Sets matched to your curriculum path are planned, so what you download follows what you are learning.
The development clients can queue single packs or the complete library, with progress shown as each pack arrives.
You will see the real size first. Before anything downloads, the product is planned to show the actual download size and an estimated installed size, with a separate allowance for overhead, so you can decide whether it fits.
Trust the download
The design is that a pack goes live only after every one of these checks passes.
The list of packs is checked against a signature before anything is fetched.
Its compressed size and hash must match the catalog.
A pack cannot expand past its stated size.
The unpacked size, hash, and puzzle count must match too.
The moves are checked against the rules of chess.
A pack becomes available as a whole, or not at all.
You can pause a download and continue later, and the development clients pick up saved ranges after an interruption. An interruption, a full disk, or a new version of the catalog cannot damage the puzzles you already have or your own attempts. Downloads run while the app is open; background downloading on iOS is not built yet.
Your practice history is private and stays on your device. Removing downloaded puzzles is something you choose to do, and it never quietly erases that history.
Offline
Some of this works in the development clients today, and some is planned.
Fully available for any pack that is installed and valid: legal moves, the replies in the puzzle, hints, and solution review.
Planned. They will work once their content and the lessons before them are installed.
Planned. Explanations you have saved stay readable with where they came from. Narration you asked for and kept will play, and the rest waits for a connection. The library does not come with an explanation for every puzzle.
Planned. A downloaded plan will run offline and keep your results, though a fresh estimate waits until you reconnect. Your work is saved and sent when you are back online.
Planned, and only where your device has the room to run it. Where it does not, the product says it is unavailable instead of guessing.
These need a connection. Your last verified rating stays on screen with its date, and a move in a game against a person is never treated as played until it is confirmed.
Before you download
AccelaStudy AI Chess is in development. Join the waitlist and we will let you know as it takes shape.
Join the waitlistIOS is a trademark or registered trademark of Cisco in the U.S. and other countries and is used by Apple Inc. under license.
Apple®, iPhone®, iPad®, Apple Pencil®, Apple Vision Pro®, and macOS® are trademarks of Apple Inc., registered in the U.S. and other countries and regions, and App Store® is a service mark of Apple Inc. Apple is not affiliated with, and does not endorse, this product.
AccelaStudy® and Renkara® are registered trademarks of Renkara Media Group, Inc. All third-party marks are the property of their respective owners and are used for nominative identification only.
