An application that helps you create chess openings build a repertoire and train against it.

Start training in just a few steps:
- Create an opening for White or Black that you want to include in your repertoire.
- Enter your best move manually for each position.
- Enter your moves automatically by importing a PGN database file (* see notes below).
- Enter opponent's most expected moves and follow with your best move for each position.
- Optionally enter the probability of occurrence (low normal high) of each possible move of the opponent.
- Optionally enter a tag name (or comment) for a given position in order to help you memorize a position or a move to play during training.
- When you are ready train against your repertoire.
- When you train your score for the current position is displayed giving you an instant snapshot of your success level for that position.
- Possibility to backup your repertoire restore it on another device or share it with your friends !

Several training modes possible.
- random simulating real game conditions:
The computer simulates opponent moves based on the probability of occurrence of each move during a game.
- random targeting weaknesses:
The computer simulates opponent moves based on your scores and targets your weaknesses.
- sequential:
The computer simulates opponent moves sequentially and ensures to cover all possible paths of your repertoire.

As you train your good and bad moves are compiled and automatically saved.
Your personal rating score is displayed for each opening.
A rating score is also computed for each move of your repertoire giving you an immediate picture of where your weaknesses are.

Additional features:
- A long press on the chessboard will copy the FEN to the clipboard.

Notes:
(*)
1) PGN import is limited to 8 moves per game in free version
2) A PGN database file is a sequential collection of one or more PGN games with or without variations. Do not hesitate to ask developer for a PGN sample.