What is how to premove on chess.com?

As an AI language model, I don't have personal experience using Chess.com's user interface, but I can provide general information about premove:

A premove is a move you make while waiting for your opponent to move. It allows you to make a quick response if your opponent moves a predictable piece. Premove can give you an advantage in timed games and can speed up your game.

To premove on Chess.com, you can follow these steps:

1. Make a move as if your opponent has made his or her move
2. Click on the box of the piece you plan to move next
3. While holding down the mouse button, drag the piece to its destination square
4. Release the mouse button to complete the premove

Note that premove is only activated when it’s your turn to move, and if your opponent’s move differs from what you expected, your premove will not be executed, and you will need to move manually.

Also, be aware that premove can be risky if your opponent makes unexpected moves or changes your game plan. It may be best to use premove only in specific scenarios and limited to pieces you plan to move if the opponent makes their next move.