Build a chess opening repertoire from the moves you already play
A repertoire you will actually use starts with the lines in your own PGN, not a file of engine-approved variations you have never reached.
The cheapest opening study is the tree you already walk. List the positions you reach often, keep the moves that score for you, and only then look for a replacement where your usual choice is leaking points.
Export the tree before you download someone else’s
Most players “study openings” by watching a course that starts from move one of a line they never play. The positions they actually reach — the fifth move after an early queen check, the sideline their pool loves — never appear.
Replay your last 80–200 standard games and write down the first decision where your games split. That split is the repertoire question. Everything before it is already decided.
Replace one move, not a whole opening
If the Italian is your most-played line and a single queen move is the leak, you do not need a new opening. You need a better choice at that fork and a few model games that use it.
Chessigma’s training positions are taken from those forks. They are not puzzles from a tactics book. They are the decisions your history says you will see again.
Frequently asked questions
Should I copy a titled player’s repertoire?
Only after you know which of their positions you actually reach. Their move 12 is useless if you are out of book on move 8.
Do I need an engine to build this?
Not for choosing which positions to study. An engine can help you check a replacement move for a tactic you cannot see. It should not pick the repertoire for you.