Blackbox runs Stockfish across your last 10–100 games and identifies the specific mistake types that keep costing you, ranked by how damaging they actually are. Not one game reviewed. Your chess, diagnosed.
Import a PGN or connect your Lichess or Chess.com account. The more games, the clearer the pattern.
Every move, every game. Not a single game reviewed, your whole history scanned for what keeps going wrong.
See your recurring patterns ranked by how much they're actually costing you, so you know exactly what to fix.
Analyze up to 10 games free. No account. No credit card. Takes about 60 seconds.