Is your opening really the problem?
When a game goes wrong, the opening is the easiest thing to blame. You lost, the line felt uncomfortable, so you go and learn a new one. But for most club players the opening isn't where the rating points go. The good news is that you can check instead of guessing.
What a real opening problem looks like
If an opening really costs you, it shows in two places: you come out of it worse than your opponents do, and you score less with it than the ratings predict, over a decent number of games. If you leave the opening roughly level and lose later, the opening isn't the problem, however memorable those losses were.
How to check your own games
- Look at the position after move 15. If the engine usually has you level or better there, your openings are doing their job.
- Count games before judging. With fewer than about 40 games in an opening, the result is mostly luck. Under about 100, treat any finding as a hint, not a verdict.
- Compare with what the ratings predict. Your score with an opening depends on who you met. Judge it against the score your ratings predicted, not against 50%.
- Find where the points actually went. If most of your losses turn on a piece left hanging in the middlegame or a lost battle with the clock, a new opening won't change that.
Other beliefs worth testing
The same goes for other things players believe about themselves. In one 2050-rated rapid player's 621 games, "I'm much weaker with Black" didn't hold up: 51% against 55%, with the same number of blunders a game. "I tilt after losses" didn't either: right after a loss they did slightly better than the ratings predicted. "My endgame is terrible" put them level with their opponents. One belief was true: their first game of a session was their worst. Checking takes the guesswork out of what to practise.
What to do instead
Keep the openings you know, learn their typical plans rather than more moves, and spend the time you'd have spent on a new repertoire on the leak that actually costs you the most. For most players that's a habit: a piece left where it can be taken, a threat missed after a quiet move, or a clock spent too early.
Check your own openings
RatingLeaks checks your recent Lichess and Chess.com games with Stockfish. For each opening you play often, it shows your score, how that compares with what the ratings predicted, and where you stand after move 15, next to the leaks that cost you the most points. The free scan takes about a minute and needs no sign-up.