Blunderproof

Tools

Free utilities that need no account and touch no training data. Stockfish runs in your browser, and nothing you paste here leaves it.

Review a PGN
WRNS chart room during the Second World War

  1. Review a PGN

    What happened in this game?

    Paste a game from anywhere: a scoresheet you typed up, another site, a friend's game. You get the same report your connected games get, every move graded with the coach's note, without connecting anything.

    Paste a game
    Example · the report on a pasted game
    1. 13Re1Be6
    2. 14Bg5Qd7
    3. 15Rad1Bd6
    4. 16Qe2?Nf4
    5. 17Qd2??Bxc4
    6. 18b3Nxg2
    17.Qd2?? left the bishop on c4 without its only defender.

  2. Analysis board

    What should have happened here?

    Any position, the engine's best lines and the moves club players choose, with the board free to try your own. Every room's explore button lands here.

    Open the analysis board

    The position is checked before the engine starts.

    Example: before 17.Qd2 in the sample game, the engine's line starts with Qf3.

  3. Board editor

    How do I set up this position?

    Drag pieces on and off, set the side to move, or paste a FEN, then hand the position straight to the engine.

    Open the editor
    Example: king and pawn against king, set up in a few drags.

  4. Your year

    How did my year go?

    Twelve months of games from a username: how many you played, how they ended, your rating month by month and the opponent you kept meeting. There is no engine in it, so it answers in the time it takes to fetch the games.

    Read a year
    Example · month by month
    1. Jan
    2. Feb
    3. Mar
    4. Apr
    5. May
    6. Jun
    Row length is games played; the dots split into won, drawn and lost.