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♞ ChessLoop
Spaced-Repetition Chess Opening Trainer
Teach it your repertoire by playing moves. It drills you back, corrects mistakes,
and schedules review so the positions that break you get more practice.
Teach / LearnPracticeFeedbackTrack
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What ChessLoop Does
Train your openings through guided repetition
Teach — play moves on the Teaching Board; each move is saved to a Line in a Library
Practice — the SRS engine (SM-2 variant) picks your weakest positions and quizzes you
Feedback — wrong answers show a red flash + correct-move arrow; you must physically replay the right move before continuing
Track — the Stats page shows accuracy heatmaps by move number and mastery % per opening
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Core Capabilities
Feature Overview
Opening Library Builder
Teach by playing moves on the board
Per-move notes and annotations
PGN export, line navigation, duplication
Spaced-Repetition Drill Engine
Modified SM-2 algorithm
Leech detection (4+ cumulative misses)
Weakness-biased session selection
Public Library Discovery
Browse, search, filter by ECO/difficulty
Fork to your own account, star favorites
Read-only viewer for browsing without forking
Track your own games
Upload your own games PGN Files
Document wins/losses, what happened, and lessons learned.
Monitor trends/progress over time to spot, analyze and correct behaviors, and habits
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Public Library Discovery
Share and Learn from the Community
Browsing
Search/filter by ECO code, color, difficulty
Star favorites, leave comments
Two Ways to Use a Public Library
Fork / Add to My Library — copies it to your account
Learn / View — read-only viewer, no forking required
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Teaching Board
Build Your Repertoire Visually
Record opening lines by dragging pieces on the board. Every move captures FEN position and PGN notation automatically.
Move Navigation
⟪ First · ‹ Previous · Next › · Last ⟫
Jump to live position or any point in the line
↓ PGN export with [Event] header
Line Management
⧭ Duplicate a line (creates a full copy)
Rename by double-clicking
Delete a move and everything after it
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Move Annotations
Document Your Strategy
Per-Move Note Editor
Click a move → Add note → type (Ctrl+Enter to save)
Notes persist across every session
Visible in Teaching, Unrated Learning, and Practice
Use Notes For
Why you play a particular move
Warning about traps in the line
Linking to outside analysis
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Practice Sessions
Drill Your Weaknesses
Weakest First — overdue items sorted by most-overdue, auto-starts the hardest positions
Leech Drill — dedicated mode for positions with 4+ cumulative wrong answers
Session priority: overdue first → leeches (in leech-drill mode) → new items (20% weight) → weakness bias (ease < 1.8 gets 2× weight)
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Intelligent Feedback
Motor Memory Through Physical Execution
The critical difference from flashcard systems: you must physically play the correct move to continue — recognition alone doesn't count.
On a Wrong Answer
Board flashes red immediately
Animated arrow shows the correct move
You cannot proceed until you play it
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Progress Tracking
See Your Improvement Over Time
Accuracy Heatmap
X-axis: move number in the opening
Bar height/color: success rate
Green ≥80% · Yellow 50–79% · Red <50%
Mastery Badges
not_started → learning → developing
advanced → mastered
Per-library, based on accuracy thresholds
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Appearance & Customization
Dark/Light Theme, Board & Piece Sets
Board Themes
Brown (default) · Blue · Green · Ice · Purple
Piece Sets
CBurnett (default) · Alpha · Mono · Shadow
App Theme
Dark (default) or Light — persists per-user, syncs across devices
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♞ ChessLoop
How how good do YOU want to be?
Teach it your repertoire by playing moves. It drills you back, corrects mistakes,
and schedules review so the positions that break you get more practice.
NOW in alpha release:
(Access will be intermittent during this alpha testing phase, as the service is running on temporary infrastructure.)
(Access will be intermittent in alpha, the service is running on temporary infrastructure.)
