I made a mistake. Nobody cares.

I wanted to exchange queens but I made a mistake with my mouse. It's called a mouse slip. I lost my queen and my opponent lost nothing.

To make sure this stupidity never happens again I changed my preferences at https://lichess.org/account/preferences/game-behavior.

"How do you move pieces?"

1. Click two squares

2. Drag a piece

3. Either

It was set to "Either". I changed it to "Click two squares".

From now on a mouse slip will be impossible.

One more thing: The best place to play chess is at https://lichess.org/ which is free and there are zero ads.

My lichess.org profile

UPDATE: Not that anyone cares but I had to change my preferences back to "Either" instead of "Click two squares" because it was slowing me down. I couldn't get used to it. In the future I will be using both "Drag a piece" and "Click two squares". Nobody cares.