FAQ
Before you type a handle.
Is it free?
The first game is free. You see the move before you create an account.
Do you need my password?
No. Public games only. We never ask for your Chess.com or Lichess password.
Does Lichess work?
Yes. Switch the toggle to Lichess, or paste a PGN if you don’t know the handle.
What do the move badges mean?
Every move gets one. We compare your winning chance before and after it, using Stockfish in your browser.
Brilliant
!!A bold sacrifice that works.
Gives up material, keeps nearly all your winning chances, and it isn't the obvious move.
Brilliant, double exclamation. A bold sacrifice that works. Gives up material, keeps nearly all your winning chances, and it isn't the obvious move.
Strong
Top-class. The engine's pick, or a hair off it.
Lost almost no winning chance (2% or less).
Strong. Top-class. The engine's pick, or a hair off it. Lost almost no winning chance (2% or less).
Good
!Solid. Keeps you on track.
Lost a tiny bit of winning chance (2–5%).
Good, exclamation. Solid. Keeps you on track. Lost a tiny bit of winning chance (2–5%).
Interesting
!?A risky offer that holds up.
Gives up material for a small cost (2–8%). You're still in the game.
Interesting, exclamation question. A risky offer that holds up. Gives up material for a small cost (2–8%). You're still in the game.
Book
Still in the opening playbook.
Every move so far is on a public list of named openings.
Book. Still in the opening playbook. Every move so far is on a public list of named openings.
Dubious
?!A slip. There was better.
Lost some winning chance (5–10%).
Dubious, question exclamation. A slip. There was better. Lost some winning chance (5–10%).
Mistake
?This one hurts.
Lost a real chunk of winning chance (10–20%).
Mistake, question mark. This one hurts. Lost a real chunk of winning chance (10–20%).
Blunder
??A big drop.
Lost more than 20%, or turned a win into a likely loss.
Blunder, double question mark. A big drop. Lost more than 20%, or turned a win into a likely loss.
Missed win
The win was right there.
You were clearly winning, or had mate in 5, and let it slip to about even.
Missed win. The win was right there. You were clearly winning, or had mate in 5, and let it slip to about even.
Already winning or already lost? We go easy: nothing worse than Dubious. Badges are a guide, not a grade.