Master chess openings, develop your personal repertoire, and practice key variations effectively.
Key Features
- Interactive opening tree with detailed game statistics
- Complete Encyclopedia of Chess Openings (ECO)
- Compare ECO and opening tree moves in any position
- Export chess openings as PGN files
- Create and manage your opening repertoire
- Add or modify comments for any move
- Automatically classify move sequences using the ECO system
- Explorer highlights moves existing in your repertoire
- Comprehensive database includes all transpositions
- Interactive trainer for memorizing openings and variations
- Practice multiple variations simultaneously against random moves from your repertoire
- Set custom starting positions for training
- Monitor your training progress and improvement
- Customize chessboard colors and piece designs
- Full dark mode support
- Fully functional offline
Master popular openings like The Queen’s Gambit, The King’s Indian Defense, and many others!
CHESS OPENING EXPLORER
Search the Encyclopedia of Chess Openings or navigate the opening tree. Swipe left or right to toggle between exploration tools in any position.
BUILD YOUR OPENING REPERTOIRE
Add preferred opening lines to your repertoire using the explorer. Edit opening names and organize them within your collection.
OPENING TRAINER
An efficient method for memorizing repertoire variations. Train white's moves, black's moves, or both simultaneously. Optionally practice all variations together with random opponent moves selected from your repertoire. Track progress with detailed statistics.
Upgrade to Chess Opener PRO for enhanced capabilities:
- Unlimited repertoire capacity
- Unlimited opening depth
- 6x larger opening tree with game statistics
- Database of 100+ grandmaster repertoires
- Advanced chess engine analysis
- Import openings via PGN format
What's New in Version 1.21.1
- Final score display no longer obstructs chessboard view
- Share/export games and positions during training
- Toggle comments visibility
- Additional improvements while maintaining clean, focused training screen



