Help

Pausing

While a game is on, the icon at the left of your clock pauses it. Tap it again to carry on.

Time controls

Tap a clock to set its time control. Yours and the engine's are separate, so you can give the engine more time than you, or less.

Changing a clock during a game sets it to the new time at once. Your moves after the change can't become time hurdles, because their thinking time no longer means what it did.

Playing Black

New Game gives you the other color each time. To change sides before your first move, use Flip board in the menu. After your first move, Flip board only turns the board round, so you can look from your opponent's side.

Playing from a position

The menu's Play from here starts a new game from the position on the board. On the Analysis page, that lets you play on from any moment of a game. Copy FEN copies the position as text, and Play from FEN starts a game from one you paste in.

Reviewing your mistakes

Once a game is analyzed, the Mistakes button appears, to step through your mistakes and blunders, and your inaccuracies too if you tick Include inaccuracies in review. On each one it becomes Next.

Importing and entering games

Import Game, in the menu, brings in your over-the-board games, or anyone's games to study.

Enter Game, beside it, is for typing in a game from your scoresheet. Each move is kept on this device as you enter it, so a reload loses nothing; Save keeps the game in your account.

Exploring variations

The Variation Widget, below the board, explores lines as a compact row of breadcrumbs. Move a piece on the board to start a variation of your own.

Every evaluation is from White's point of view: -4.20 means Black is winning, and #-3 means Black mates in three. Beside a mistake, the colour is for the side that made it: red when the move hurt them. The engine stops by itself once it has searched deep enough.

Move times

The evaluation graph also shows how long you took over each move, on a logarithmic scale. The orange time on the right marks what counts as a long think.

A hurdle is a position from one of your games where there was a better move to find. Training shows you the position again, and asks you to find it.

Practiced

How many times you have trained a hurdle. Your first move on it counts one practice.

The number just left of Next → is how many hurdles you have trained today. It starts again at 4am, so a session after midnight counts as the night before.

Mastery

When you train a hurdle, your first move is the one that counts. If it is the best move and you did not use 💡Hint, its streak goes up by one. A wrong first move, or using 💡Hint, sets it back to 0.

3 in a row, and the hurdle is Mastered. The streak keeps counting after that.

Your games are on the home page, in up to three lists.

My History holds the games you played: every game here, and any game you import and say you played. Analyzing one finds your hurdles.

Reference Games holds games you saved to study but didn't play. Analyzing one finds no hurdles, because the moves aren't yours. My side, in the menu on the Analysis page, moves a game between these two lists.

Sample Games are two famous games, there for everyone, signed in or not, to try the Analysis page on. They make no hurdles either.