When pre-moves are enabled, you can make a move during your opponent's turn that will automatically be played as soon as it's your turn. To do this, simply move the piece as if it were your turn. The move will be highlighted in red on the board:

In the above picture, Black's move, d5, is highlighted in yellow. Black then made a pre-move, which is highlighted in red, Nc6. The knight move isn't on the board yet but will play automatically as soon as White moves, no matter what White does! For example, if White captures the pawn with exd5, Nc6 would be a very bad move!

So be careful! The pre-move will play automatically even if your opponent does something unexpected, and it might end up being a blunder.

Pre-moves take effect almost instantly, using only 0.1 seconds of your remaining time.

If your opponent's move makes your pre-move illegal (such as putting your king in check), your pre-move will be canceled, and you'll have to make a different move.

You can make up to five pre-moves on your opponent's turn. They will be played in the order you made them, subject to the limitations described above.

For example, if you are playing Black, at the beginning of a game you could pre-move g6, Bg7, b6. The system will automatically play 1...g6, 2...Bg7, 3...b6 immediately after White plays their first three moves - so long as white does not put your King in check within those three moves (in which case the next pre-move would be rejected and you would have to deal with the threat to your King).

On the Android app, you can set single or multiple pre-moves: