Master chess openings, build your personalized repertoire, and hone your opening skills with this comprehensive app.

Key Features:

• Interactive Opening Tree: Explore chess openings with integrated game statistics.
• ECO Integration: Utilize the Encyclopedia of Chess Openings (ECO) for comprehensive analysis.
• Side-by-Side Comparison: Compare ECO codes and opening tree moves simultaneously.
• PGN Import/Export: Seamlessly import and export openings in PGN format.
• Customizable Repertoire: Build and manage your own opening strategies.
• Annotate Moves: Add and edit comments directly on moves.
• Automatic ECO Classification: Automatically categorize any move sequence using the ECO system.
• Repertoire Highlighting: Easily identify moves already included in your repertoire.
• Comprehensive Database: Access a database encompassing all transpositions.
• Interactive Trainer: Memorize openings and variations through interactive training.
• Multi-Variation Training: Practice multiple variations simultaneously against randomized opponent moves.
• Customizable Training: Set custom starting positions for targeted training.
• Progress Tracking: Monitor your training progress with detailed statistics.
• Customizable Interface: Personalize your chessboard colors and pieces.
• Dark Mode Support: Enjoy a comfortable dark mode experience.
• Offline Functionality: Use the app completely offline.

Learn popular openings like the Queen's Gambit, King's Indian Defense, and many more!

Chess Opening Explorer:

Search the ECO or navigate the opening tree. Easily switch between exploration features at any point in the game.

Repertoire Builder:

Add your preferred opening lines to your repertoire using the explorer. Edit opening names and organize your repertoire efficiently.

Opening Trainer:

Effectively memorize opening variations. Train white's, black's, or both sides' moves, optionally training all variations at once against randomized opponent moves from your repertoire. Track your progress and view your statistics.

Chess Opener PRO (Upgrade):

Unlock advanced features:

• Unlimited repertoire size and opening depth.
• Expanded opening tree with game statistics (6x larger).
• Database of 100+ grandmaster repertoires.
• Powerful chess engine analysis.
• PGN import functionality.