Great project, but notice that the license is CC-BY-NC, which is neither FSF-compliant nor OSI-compliant because it fobids commercial use of the work.

https://github.com/ornicar/lichess/blob/master/LICENSE

Interestingly, the license used to be MIT: https://github.com/ornicar/lichess/commits/master/LICENSE

The gradient highlighting of the squares and some of the animation is a little distracting. Otherwise looks like a very good alternative to chess.com. I'll definitely give it a try.

Losing against their level 1 computer player reminded me of how bad I'm at chess...

very nice.