Opening Prep

Opening Prep helps you turn games and ideas into an opening repertoire you can analyze, organize, and practice.
ANALYZE ON AN INTERACTIVE BOARD
• Start from the initial position or load a game from PGN
• Paste PGN, read it from your clipboard, or share supported PGN text to the app
• Follow live Stockfish evaluations and compare up to six candidate lines
• Step through moves, explore alternatives, flip the board, and see recognized opening names
LEARN FROM GAME HISTORY
• Download available completed games for any Chess.com username
• Keep each player’s game library available on your device
• Filter games by date, player or color, result, and time control
• Open any downloaded game for detailed move-by-move analysis
BUILD YOUR OPENING BOOKS
• Save lines to one or more custom books
• Organize lines by opening and variation
• Choose whether to practice each line as White, Black, or both
• View saved continuations and retry missed book moves
PRACTICE YOUR REPERTOIRE
• Choose a book and train one opening or every saved line
• Practice your selected side while Opening Prep plays the stored opposing moves
• Reveal a book move when you need a hint
• Track lines remaining and continue until the session is complete
KEEP YOUR WORK
• Save games and reopen them later
• Filter saved games by date, site, player, color, result, and time control
• Download, share, and restore saved-game backups
• Choose piece themes and sound packs
• Tune Stockfish threads and hash size for your device
Whether you are preparing a new opening, reviewing recent games, or drilling your repertoire before your next match, Opening Prep keeps the workflow in one place.
Internet access is required to fetch Chess.com game history. Stockfish analysis runs on your device.
Opening Prep is an independent app and is not affiliated with or endorsed by Chess.com.