A chess opening repertoire builder for your own choices

Build a repertoire you can maintain

Start with one playing color and an opening you already use. Add your preferred move, then the replies you actually encounter. A small, explained tree is easier to maintain than a large imported file whose ideas you do not yet understand.

Play moves directly on the board in the editor. Set a main continuation, keep useful alternatives and add comments, annotation symbols, arrows and circles. A note can identify an important square, an exchange to aim for or a signal that it is time to change plans.

Import PGN without surrendering your decisions

If you already have opening variations in PGN, import them and inspect the resulting tree. Check the playing color, useful branches and comments before treating the file as your preparation. A line appearing in an import does not mean you have chosen or understood it.

Keep opening material distinct from a collection of games you want to analyze. PGN supports both, but a complete game is not automatically a repertoire suited to your play. PGN export gives you a portable copy of the variations you decide to keep.

Connect moves with plans

At a branching point, explain why you prefer one continuation. Use Stockfish to check a tactical possibility or move order, then write the conclusion in words you understand. An engine score cannot replace a plan you can recall during a game.

Once the tree is ready, use the opening trainer to test your recall. Return to the builder when a mistake exposes an unclear idea. This editing and practice loop improves the repertoire without assuming that every problem needs a longer line.

Questions before you start

Continue your opening work

• A chess opening trainer for recall, not just rereading
• Use PGN game analysis to improve your opening repertoire
• Prepare for an opponent while keeping your repertoire in view

All features (French) · Application guide