An application that helps you create chess openings, build a repertoire, and train against it. (Try this demo version before buying the pro version.)The main concept of this application is to learn ONE move (your best move) per position and to be prepared for ALL possible responses from your opponent. This allows certain variations, but these variations will always come from the opponent's side. Your best move is the one that, in your opinion, is the best of all possible moves, from of all possible variations, for a given position. The idea is to always follow familiar paths on well-known terrain (avoid being trapped in uncomfortable positions). This can be achieved more easily by narrowing down the number of variations to learn, otherwise the number of moves to learn would be HUGE.♚ You have an ebook in PGN format? Import you PGN file and start training instantly! Chess Repertoire Trainer is the perfect companion of your ebook.♚ Built-In chess engine (Stockfish) to help you find the best moves for your openings!♚ Optionally resume playing against the chess engine when you reach the last position of an opening line.♚ PGN files import (moves and comments), ideal chess book companion.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).- Use the chess engine to find the best moves for your openings.- 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. ♚ target weaknesses: The computer simulates opponent moves based on your scores and targets your weaknesses.♚ full coverage:The computer simulates opponent moves sequentially and ensures to cover all possible paths of your repertoire.♚ random:The computer simulates opponent moves based on the probability of occurrence of each move during a game.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 version2) A PGN database file is a sequential collection of one or more PGN games with or without variations.3) The program Stockfish is responsible for the intelligence of the chess play and can be found here:https://stockfishchess.org/The Chess Repertoire Trainer user interface and the Stockfish chess engine are strictly separated. The UCI protocol (universal chess interface) is used to communicate between Stockfish and the user interface.