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Lichess is very impresive and getting excited each day. I would like to imagine about new concepts what will be following day.

Please expand your ideas? Wich kinds of concepts do you want to see?

Sacrifice engine. it will be as soon as possible.


What's a "sacrifice engine"?

it could be like show threat x - also to bottom to show sacrifice x -

You already can examine several lines at the time, there is no reason for the engine to show a sacrifice if you can't get any advantage out of it. You can also enable local evaluation in analysis mode and try the sacrifice move yourself, and engine will evaluate it for you.