MainLine: Chess Openings

MainLine helps you build a chess opening repertoire and actually remember it.

BUILD YOUR REPERTOIRE
• Play moves on the board, or import PGN from anywhere.
• See how often each move is played at your rating, and how it scores, from millions of Lichess games and master games.
• Stockfish runs on your device to check every move.
• Coverage shows how much of what opponents really play you've prepared, and where the gaps are.
• Start fast with starter repertoires: Italian, London, Caro-Kann, Queen's Gambit Declined.

REMEMBER IT
• Spaced repetition (FSRS) schedules each position right before you'd forget it.
• Learn new moves, review what's due, drill whole lines against realistic replies, or quiz your weakest positions.
• Short daily sessions, a streak and a daily goal keep you consistent.
• Reminders when positions are due.

LEARN FROM YOUR GAMES
• Import your Lichess or Chess.com games and see exactly where each one left your prep.
• Forgotten moves go straight back into review.
• Prepare for an opponent: see what they usually play and where it meets your repertoire.

UNDERSTAND THE IDEAS
• Ask the coach why a move is played. Explanations are checked against the position so they stay accurate.

MADE TO FEEL RIGHT
• A smooth board with drag, tap-tap moves, sounds and haptics.
• 20 themes, board colours, piece sets and fonts.
• Works fully offline. No account needed. Sign in with Lichess to sync across devices.
• No ads, no tracking. Free and open source (GPL-3.0).