Chess Opening Trainer & Drills
Memorize Sicilian & Ruy Lopez
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Out of book by move six? 20 classic openings — line, idea and plan — on a replayable board, with a quiz that proves you actually remember them.
You know how the pieces move. You still get lost by move six. ChessOpen is the fast way to fix that: the main lines and ideas of the classic chess openings, cut down to what you can actually memorize.
This is not a course platform and not a chess engine. It is a pocket file of 20 classic openings — Ruy Lopez, Sicilian Najdorf, Queen's Gambit, London System, King's Indian and more — each with its engine-verified main line on a replayable board, one paragraph on what the moves do, and one on the plan that usually follows. Five focused minutes at a time, entirely offline.
WHAT YOU GET
• Play through the Ruy Lopez, Sicilian Najdorf, Queen's Gambit and 17 more main lines move by move on a full board
• Know WHY each move is played — every opening carries the idea behind the line and the typical middlegame plan
• Quiz yourself on the next book move — every wrong option is a legal move in that exact position, so lucky guessing never works
• Watch your recall climb: questions answered and percent correct, tracked right in the app
• Find any line in seconds — search by opening name, ECO code or the moves themselves
• Study on the train, on a plane, anywhere — the whole library works offline, no account, no sign-up
PERFECT FOR
• Club and online players who know the rules but drift out of book by move six
• Beginners picking a first opening for White and a first defense for Black
• Returning players who once knew their lines and want them back
• Anyone who prefers ten focused minutes to an hour of video lessons
WHY NOT JUST A COURSE PLATFORM?
Course platforms are built for people with hours to spend and a syllabus to follow. ChessOpen is the pocket version: the openings that actually appear in your games, each reduced to the line, the idea and the plan — a library small enough to finish.
PRIVATE BY DEFAULT
Everything runs on your iPhone. No account, no tracking, no data leaves the device. Your saved openings and quiz record stay yours.
FULL ACCESS
ChessOpen Pro unlocks the complete index: all 20 opening files with their full lines, board replay, ideas, plans and quizzes. Choose a Weekly or Yearly auto-renewing subscription, or a one-time Lifetime purchase.
Download ChessOpen, open the Ruy Lopez file and step through the first eight moves — tonight's games will feel different.
Terms of Use: https://leanstudio.asia/terms-of-use
Privacy Policy: https://leanstudio.asia/privacy-policy
Support: support@leanstudio.asia
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The developer, LEAN ASIA CO., LTD, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
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Information
- Seller
- LEAN ASIA CO., LTD
- Size
- 3 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Repertoire Lifetime $29.99
- Flashcards Yearly $14.99
- Theory Quiz Weekly $2.99
- Copyright
- © 2026 LEAN ASIA CO., LTD