Master chess openings, develop your personal repertoire, and practice key variations.

Key Features

- Interactive chess opening tree with game statistics

- Complete Encyclopedia of Chess Openings (ECO)

- Compare ECO and opening tree moves in any position

- Export chess openings as PGN files

- Create and manage your personal opening repertoire

- Add and edit move comments

- Automatic ECO classification for any move sequence

- Opening explorer highlights repertoire moves

- Comprehensive chess database includes all transpositions

- Interactive trainer for memorizing openings and variations

- Train multiple variations simultaneously against random repertoire moves

- Set custom starting positions for training

- Monitor your training progress

- Customizable chessboard colors and piece sets

- Dark mode support

- Full offline functionality

Learn popular openings like The Queen's Gambit, The King's Indian Defense, and many others!

CHESS OPENING EXPLORER

Search the Encyclopedia of Chess Openings or navigate the opening tree. Swipe left or right to toggle between exploration tools in any position.

BUILD YOUR OPENING REPERTOIRE

Add favorite opening lines to your repertoire using the explorer. Customize opening names and organize your repertoire as needed.

OPENING TRAINER

An efficient system for memorizing repertoire variations. Train white's moves, black's moves, or both simultaneously. Optionally practice all variations together with randomly selected opponent moves from your repertoire. Track your progress with detailed statistics.

Upgrade to Chess Opener PRO for enhanced capabilities:

- Unlimited repertoire size

- Unlimited opening depth

- 6x larger opening tree with advanced statistics

- Database of 100+ grandmaster repertoires

- Advanced chess engine analysis

- PGN format import capability