The fastest way to improve at chess is fixing the one thing you keep getting wrong

Why broad training keeps you stuck

A thousand tactics puzzles won't fix a back rank problem. Endgame videos won't help if you keep hanging pieces in the middlegame. Opening prep is irrelevant if you can't convert winning positions. Generic training has no relationship to the specific mistakes actually showing up in your games.

Targeted practice on your actual weakness is faster than broad training by a significant margin. The players who improve quickly are usually the ones working on the right thing, not the ones working the hardest on something adjacent.

How BlackboxChess finds what to fix

Connect your Lichess or Chess.com account. Stockfish analyzes your last 10 to 100 games, flags positions where you made significant errors, and classifies each one by type. The results are ranked by how much each pattern costs you per occurrence, not just how often it shows up.

The system tracks dozens of mistake types across categories: material loss, king safety, piece activity, pawn structure, and endgame technique. Most players have one that's clearly worse than the others.

The fix course

With the full report, you also get a short drill course generated from your actual games. The positions come from your own game history: real situations where your specific weakness appeared. Not generic puzzles. About 10 drills.

Short enough that you'll actually do it. Targeted enough that it's more useful than an hour of random puzzle grinding.

Who this is for

Players roughly between 800 and 2000 Elo who have played enough games to have real patterns. If you've played fewer than 20 online games the free report will still run, but there's less to go on. If you're an experienced player stuck at a rating, this is exactly what it was built for.