2 player chess on the same computer

Hi,
Sometimes i will be playing chess when a friend of mine might see me playing chess on my phone and ask to challenge me to a game. But i don't see an option where i can play against my friend using the same phone. It was pretty embarrassing when i said that i will set up a 2 player game then couldn't find any option like that. Can we implement an option like that for the computer and phone.
thank you

The mobile app ( http://en.lichess.org/mobile ) has this option. Select "Play offline, over the board" from the slide in menu.

oh thank you, what about on a desktop computer ?

You can play yourself.

Click "play against a friend", and paste the link in a new window/tab. Then switch.

That works.

Or, you can use this tool: http://en.lichess.org/analysis.