| Side | Accuracy | Inaccuracies | Mistakes | Blunders |
|---|
Choose an opponent from beginner, who misses simple tactics, through Elo 1400 to 2400 up to full strength. Play White or Black, ask for a hint when you are stuck, and switch on the evaluation or the best move only when you want them.
The analysis board shows the best move, the evaluation and the top three lines, with arrows on the board. Enter moves for both sides by tapping or by typing them, load a position from FEN, or continue a game from PGN. After a game, the review marks your inaccuracies, mistakes and blunders and shows the better move.
The engine runs in your browser, so there is nothing to install and no sign-up. Your games never leave your device. Gunnie's Gambit is free and open source.
No. Despite the name, Gunnie's Gambit is a free web app for practising chess against the computer and analysing positions. The name is a play on chess gambits such as the Queen's Gambit.
It is free and open source, with no account, no sign-up and no ads.
There are seven levels. Beginner and Novice play weak moves on purpose and miss simple tactics. The Elo levels play at roughly 1400, 1700, 2000 and 2400, and Full strength is the complete engine, stronger than any human player.
Yes. Switch to Analyse, then paste a PGN or a FEN position under "Position & PGN", or enter the moves on the board. You see the best move, the evaluation and the top three lines for the position on the board. Review game then goes through the whole game and marks the mistakes.
When a game against the computer ends, or for any game in Analyse, choose Review game. The engine evaluates every position and marks a move as an inaccuracy (?!), mistake (?) or blunder (??) by how much of your winning chances it gave away, with the better move shown on the board. The thresholds and the accuracy percentage follow the Lichess method, so the figures are close to Lichess’s but not identical. A 40-move game takes about half a minute on a laptop and a few minutes on an older phone.
No. The engine runs in your browser and your games and settings are stored there too. The only thing sent anywhere is an anonymous, cookieless visit count.
Yes. It works in any modern browser on a phone, tablet or computer, and you can add it to your home screen.
Only against computer bots, where the site allows it. Using engine help in any online game against a human, rated or casual, or in an over-the-board tournament is against the rules and gets accounts banned on Chess.com and Lichess.