Chess Openings Trainer Theoria

Learn chess openings with move-by-move explanations from FIDE Master Maksims Golubovskis (Maxoun). Theoria helps you understand the ideas, practise the lines and build a repertoire you can bring to your next game.

Whether you are choosing your first opening or refreshing your preparation for rapid, blitz or club games, start with one line and build from there.

Understand the ideas behind the moves
Study openings on an interactive chessboard with hints, arrows and clear commentary. See what each move is trying to achieve as you work through the line.

Practise your opening repertoire
Once you have learned a line, play it from memory in Practice mode without hints. Revisit your training mistakes and track your progress as you learn more variations for White and Black.

Find a starting point
Choose your level and goal to get an opening recommendation, or explore the library yourself. Learn one opening at a time, with short sessions that fit around your games.

Learn from your own games
Import games from Lichess or Chess.com to see where you left your repertoire and find lines to revisit. Use your recent games to give your next study session a focus.

Build a daily chess habit
Return for daily practice, keep your streak going and test yourself with quizzes and chess puzzles.

Start free, go deeper with Pro
Try free opening lines, Study and Practice modes, and a Daily Pro Line preview. Theoria Pro unlocks all opening lines and variations, unlimited quizzes and higher game-import limits. Paid plans are optional; available plans and prices are shown in the app.

Learn in your language
Theoria supports English, French and Russian.

Pick an opening, understand the first line and practise it for your next game.

Recent changes:
Bug fixes and minor improvements