Practice Board
Training arena
⚠ Danger zone settings
Pick your training mode
The practice board is where everything Chess Lab learns about you gets put to work. Pick a focused mode, or jump into free play to explore.
Training modes
Recommended
🎯
Weakness Drill
Practice positions matching your weaknesses — real blunder moments from past games plus generated scenarios for conversion and tactics.
Coach on
Danger zone
0 scenarios ready
♟
Play the Coach
Full game vs Stockfish. The coach reacts to your critical moves, gives danger zone warnings, and tracks your record over time.
Coach on
Default: max strength
📖
Opening Drill
Practice an opening against book moves. The coach tells you when you've left theory and shows you the move you should have played.
Coach on
🧪
Free Play
Sandbox mode — set up any position, move pieces freely, see Stockfish evaluation. No coach, no goals, just exploration.
Coach off
No tracking
Your training stats
vs Coach record
♟
—
Start training to track stats
Warnings heeded
⚠
—
Start training to track stats
Openings drilled
📖
—
Start training to track stats
← Back to modes
🧪 Free Play
Sandbox mode — explore positions freely
White
Black
✕
Done ✓
↺ Play Again
✏ New Position
0.0
Choose promotion piece
Best Move
Eval Bar
↩ Undo
↺ Reset
✏ Set Position
Move History
No moves yet
← Back to modes
🎯 Weakness Drill
Positions pulled from your actual games and your specific patterns.
📊
Analyze games first
Weakness Drill needs to know your patterns. Analyze 3+ games and generate recommendations, then come back.
Go to Recommendations
Recommended
🎯
Train your weaknesses
5-10 positions per session. Mostly generated scenarios that match your specific patterns, with occasional real moments from your past games.
0 weaknesses identified
5-10 positions
🔁
Drill past blunders
Replay the exact critical moments from your past games. Find the move you should have played.
0 critical moments saved
Your weakness training progress
Sessions completed
0
All-time accuracy
—
Best streak
0
← Exit drill
Train your weaknesses
Position 1 of 8
📍
This is a moment from your real game
⚠
Pattern
Find the best move.
What's your move?
Choose promotion piece
White to move
♟
Coach
Play your move to get feedback.
Try again
Next →
This session
Correct
0 / 0
Current streak
0
Best streak
0
Drilling
Pattern
—
All-time accuracy
—
Session complete
Here's how you did
0 / 0
By pattern
Stats updated
Drill again
Back to modes
← Back to modes
♟ Play the Coach
Full game vs Stockfish with AI coaching
Coach commentary
Stockfish skill
Max
Strong
Medium
Easy
Beginner
Play as
White
Black
Random
New Game
0.0
Choose promotion piece
↺ Play Again
♟
Coach
✕
Engine's top choice:
Click New Game to start
Resign
Move History
No moves yet
← Back to modes
📖 Opening Drill
Study, watch, and drill any opening line
Recommended for you
Browse openings
Move theory pulled from Lichess masters database (real tournament games). Strategic explanations are AI-generated to help you understand the ideas. For deep tournament prep, supplement with a chess book or course on your chosen opening.
← Back to openings
Opening
Drill as:
White
Black
⏸ Pause
Slow
Normal
Fast
⏹ Stop
♟
Coach
Walk me through the ideas
Show me the main lines
Ask the coach anything
Pick a button above to start learning, or jump straight into the drill below.
Send
🎯 Drill this opening
← Exit drill
Drilling Opening
Drilling as
White
Current streak
0
Best streak
0
Attempts
0
♟
Coach
✕
Your turn
💡 Hint
↺ Reset to start