Dive deep into the world of chess openings, craft your personal repertoire, and master variations with precision. Whether you're a beginner or an advanced player, this app offers everything you need to understand and internalize opening theory effectively.

Key Features

• Chess Opening Tree with Game Statistics: Explore move popularity and success rates based on real game data.
• Encyclopedia of Chess Openings (ECO): Access detailed classifications and descriptions of standard openings.
• Side-by-Side Comparison: Compare ECO moves with your opening tree in any position for better decision-making.
• Export Chess Openings in PGN: Save and share your favorite lines effortlessly.
• Build Your Own Repertoire: Personalize your learning by curating specific openings that suit your style.
• Edit Move Comments: Add notes to help remember key ideas behind each move.
• Automatic ECO Classification: Let the app classify any sequence using the official ECO system.
• Interactive Repertoire Highlighting: The explorer shows which moves are already in your repertoire for clarity.
• Comprehensive Chess Database: Includes all transpositions so you never miss alternative paths.
• Memorization Trainer: Practice your lines interactively to reinforce learning.
• Variation Training: Train multiple branches against randomized opponent responses from your repertoire.
• Custom Starting Positions: Set up any position to drill specific scenarios.
• Progress Tracking: Monitor your improvement over time with built-in performance stats.
• Customizable Interface: Choose from various board colors and piece sets to suit your visual preferences.
• Dark Mode Support: Protect your eyes during long study sessions.
• Offline Functionality: No internet? No problem. Learn anytime, anywhere.

Learn Popular Openings

Master classic openings such as [ttpp], [yyxx], The Queen’s Gambit, The King’s Indian Defense, and many more—all within a structured and intuitive platform designed for rapid growth.

CHESS OPENING EXPLORER

Search through the Encyclopedia of Chess Openings or navigate the chess opening tree with ease. Swipe left or right to switch between exploration modes and analyze any position dynamically.

BUILD YOUR OPENING REPERTOIRE

Use the chess opening explorer to add your preferred lines to your personalized repertoire. You can rename and reorganize entries at any time to keep your strategy clear and tailored to your playstyle.

OPENING TRAINER

An efficient tool to memorize opening variations. Train white’s lines, black’s responses, or both. Optionally, test yourself across all variations simultaneously. The trainer uses random opponent moves from your own repertoire to simulate realistic challenges. Track every session with detailed progress reports and statistics.

Upgrade to Chess Opener PRO

• Enjoy unlimited repertoire size and depth.
• Access a 6x larger opening tree with comprehensive game statistics.
• Explore a database featuring repertoires from over 100 top grandmasters.
• Benefit from powerful chess engine analysis for deeper insights.
• Import openings directly in PGN format for seamless integration.

What's New in Version 1.21.1

Last Updated: June 27, 2024

The latest update brings a refined training experience:

• The final training score no longer obscures the chessboard for uninterrupted review.
• Share or export games and positions while in the middle of training.
• Toggle comments on and off without leaving the screen.
• A cleaner, more focused interface keeps distractions to a minimum.