Stop grinding puzzles.
Start fixing YOUR chess.
You've solved a thousand tactics and you're still stuck. Generic puzzles train problems you don't have. BlunderBlaster reads your actual games, finds the ONE pattern costing you the most rating, and Coach Marv helps you beat it — one thing per week, with receipts.
No spam — one note when it's ready.
How it works
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1
Connect your username
Chess.com, Lichess, or both. No password, no OAuth. We read your public games.
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2
Get your one thing
Not a dashboard. Not 500 puzzles. The single habit costing you the most rating, explained in plain English.
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3
Beat it, with proof
Practice built from your own blunders, a coach who remembers, and real numbers when it works: "Three weeks ago: a hung piece every 2 games. Now: one in ten."
"I went through your last thirty games. Here's what nobody's told you: your chess isn't the problem. Tuesday night was the problem — six games after that first loss, each one a little faster and a little angrier than the last. A puzzle app can't fix that. One week with me can."
Who it's for
Built for adult improvers stuck under 1500 — people with five hours a week, not five hours a day. Finished Duolingo Chess? This is what comes next: your actual games.