A Stockfish report on your chess.com games
Stockfish checks every move of up to 2,000 of your games and gives you a straight answer, backed by significance tests. Then it ranks what’s costing you rating points and gives you eight weeks of work to get them back.
One-time. No account.
In your inbox in about 1.5 hours.
A rating chart can’t tell skill from a hot streak. The engine can. Your report compares your recent games with your earlier ones, move by move, and says which it was. These are the two sample reports.
799 → 1,039 in 90 days
Luck.
Move quality didn’t change. What changed is that more lost games get saved. A 200-point swing inside 90 days has happened in half of all 90-day windows since 2020.
334 → 1,034 in six months
Real.
Accuracy is up, big mistakes are down, and more of the opponent’s blunders get punished. Fewer wins come from lost positions, so it isn’t luck.
Not a dashboard of numbers to squint at. A coach’s read of your games: what’s really happening, what it costs you, what to do about it.
Every leak comes with the positions where it happened. You decide first, then step through what you played against what Stockfish wanted. This one is from Player B’s rapid games:
Move 13. 9:11 on the clock. White is +7.7.
“You’re a piece up. Time to castle?”
Pick What was played or Best move, then step with the arrows. You can also move the pieces yourself.
Every big mistake gets classified: the piece you left hanging, the fork you walked into, the won game you let go. Then the report counts them and puts the most expensive habit first.
These are Player A’s six, from 4,606 big mistakes in 2,000 blitz games.
One-move oversights
1,081 mistakes, 23% of all
Your blunder rate is the same with 90+ seconds on the clock (7.4 per 100 moves) as with under 10 (6.1). This is not time trouble. It is not looking.
Not taking what’s offered
You cash in only 58% of opponent blunders
243 free pieces left on the board. 19 mates-in-one not played. Opponents blunder as often as you do; whoever notices first wins.
Openings that start you in a hole
As Black: −1.8 on average by move 10
In a quarter of all games your first blunder comes before move 10.
Not converting won games
Reached +5 in 1,220 games, lost 382
When you are winning you keep attacking at 2 seconds a move instead of trading down and checking your own king.
Two-move tactics
≈1,900 mistakes punished by a short tactic
Endgames played at 1.4 seconds a move
Score in 40+ move games: 38%
A plan built for your leaks and your time control, with a number to hit each week. Week 8 you play again and re-measure.
“Play 5+3 or 10+0 for the next 8 weeks. You cannot build a look-first habit at 3 seconds a move. 10,000 games of 3+0 have produced zero rating change.”
Player B’s plan, rapid 10+0
Weeks 1–2
Closing out won games
Score from +5 ≥ 85% (now 77%)
Week 3
A Black repertoire, and patching 1.b4
Eval at move 10 as Black ≥ −0.5 (now −1.0)
Weeks 4–5
Two-move tactics
Punish ≥ 75% of opponent blunders (now 69%)
Week 6
Finishing: mates and stalemate
No draws from winning positions
Week 7
Rook endings
Winning endgames converted ≥ 88% (now 81%)
Week 8
Audit again
Accuracy gap vs opponents ≥ +3 (now +1.7)
Two real players, two real reports, unedited. This is exactly what you get, built from your games instead of theirs.
chess.com / Player A
10,837 blitz games · stuck at ~1,000 for five years
You don’t need more chess knowledge. You need to look before you move.
79.7%
accuracy. Opponents: 79.6%.
2.3
game-changing mistakes per game
382
games lost after being +5 or better
chess.com / Player B
1,570 rapid games · 334 → 1,034 in six months
You are getting better. Now stop giving back the games you’ve already won.
84.3%
accuracy, last 30 days. Opponents: 82.6%.
42%
of big mistakes made from winning positions
6:53
median clock when a won position slips
1
Pay $10 and tell us your username
Checkout is Stripe. Enter your email and your chess.com username there. No account, no password.
2
Stockfish goes through every position
Up to your latest 2,000 games, every move. For a heavy player that’s around 130,000 positions. It takes about an hour and a half.
3
Your report arrives by email
A private link to your report. Open it on any device, come back to it for the whole eight weeks.
Games come from chess.com’s public API. Stockfish 19 evaluates every position at 150,000 nodes. A big mistake is a single move that loses at least 20 win-percentage points, using the Lichess win-% model. Accuracy uses the Lichess formula, so it reads a little differently from chess.com’s CAPS.
“Improving or lucky” compares your last 30 and 90 days with your earlier games using a Welch test. When a change isn’t significant, the report says so. Mistake types (forks, loose pieces, back-rank) are tagged by rules, so treat them as a strong hint rather than gospel.
$10once
No subscription. No account. Nothing to install.
Secure checkout by Stripe. Report link by email in about 1.5 hours.
Your chess.com games, pulled from chess.com’s public API. Other sites aren’t supported yet. Stockfish analyzes up to your latest 2,000 games in the time control you play most. Older games still feed the opening, streak and time-of-day statistics.
We recommend at least 100. The report compares your recent games against your earlier ones, and with fewer games the statistics can’t tell a real change from noise.
About an hour and a half after you pay. If anything goes wrong on our side, we email you.
Game Review looks at one game. This looks at thousands, counts which mistakes you keep making, ranks them by what they cost you, and tests whether your rating moved because you got better or because the dice rolled your way.
Your email, your chess.com username, and your public game data. Payment is handled by Stripe; we never see your card. Your report sits at an unlisted link that only you get.
Email us and we refund you. Same if we can’t analyze your account.
Anything else: hello@trychessgoat.com