OPENING TRAINER
Build YourOpening Repertoire
Stop memorizing thousands of moves blindly. Build a repertoire based on what players at YOUR level actually play, with AI explanations for every line.
DATA-DRIVEN GENERATION
Algorithmically Built From 2.3 Billion Games
Your repertoire isn't guesswork—it's generated by sophisticated algorithms analyzing 2.3 billion real games. Every move shows exact statistics like "Frequency 49% (83M games)" so you know precisely what you'll face.
24 billion position-move pairs analyzed
Universal repertoires: 20 lines = 97% coverage
Weighted scoring: win rate + popularity + engine eval
Beginner-friendly: master all common openings in one repertoire
ELO-BASED FILTERING
Be Prepared for What You'll Actually Face
Players at different levels play very different moves. We filter openings based on YOUR ELO so you study what's most likely to appear in your games.
Same Opening, Different Moves
2200+
Main theoretical lines from opening books
34%1400-1600
Practical gambits and aggressive variations
47%At your level, opponents often deviate from main theory. We prepare you for the moves that are actually played—not just what's in the books.
SMART GENERATION
How We Build Your Repertoire
Our algorithms don't just copy books—they analyze billions of positions to find what actually works at your level.
Position Tree Construction
Starting from your chosen opening, we explore all possible continuations filtered by your ELO range and minimum game count.
Optimal Move Selection
For each position, we select the best move using a weighted algorithm: 50% win rate, 30% popularity, 20% engine eval.
Coverage Optimization
Smart algorithms find lines that maximize coverage—you only study moves you'll actually face in real games.
Blunder Detection
Every opponent move is analyzed to detect common mistakes at your level, so you learn to punish real blunders.
Selection Algorithm
50%Win Rate
Success at your ELO
30%Popularity
How often played
20%Engine Eval
Computer assessment
VISUALIZATION
See Your Repertoire as a Mindmap
Interactive visualization helps you understand how lines connect and identify gaps in your coverage.
- See all variations at a glance
- Click to explore any branch
- Track coverage percentage
- Identify gaps in your repertoire
SPACED REPETITION
Actually Remember Your Lines
Generation is only half the battle. Our training mode uses spaced repetition to help you retain your repertoire.
Initial Learning
Play through each line with explanations
Testing Phase
Practice from various positions
Review Scheduling
Lines you struggle with appear more frequently
Mastery Tracking
Visual progress indicators for each line
AI-POWERED
Every Move Backed by Millions of Games
Each move shows precise statistics—like "Frequency 49% (83M games)"—so you know exactly how often you'll face it. Plus AI explanations for the strategic ideas.
e4
The move e4 is the most popular and ambitious way to start the game, immediately placing a pawn in the center to control d5 and f5. This facilitates rapid development by opening diagonals for both the bishop and queen.
You don't just memorize moves—you understand why they work, backed by statistics from millions of real games.
Ready to Build Your Repertoire?
Create your account and build a repertoire you understand.
Request accessPaid access with beta availability