I got connected to Sami at Echo Chess through my blog post, it's fascinating how much further he's taken his side project (it looks like a real labor of love)!
game: https://echochess.com/
blog: https://samiramly.com/chess
video:
https://www.youtube.com/watch?v=4HOJwK7bQvw▾
It's now out of beta with Classic, Epic and Zen modes - perhaps something for the weekend