Engine

In the last weeks Stockfish engine was 13, why now is 11?

What browser and browser version are you using?

Upgrade to the latest available version of the browser You’re using

I'm using Google Chrome

Do you notice the difference between standard and variants?

I've upgrated Chrome but always Stockfish 11; what's the meaning of difference between standard and variants?
Thanks

Go to analysis board. The click on the three-line option (You will find it at the bottom-left corner of the notation area beside the board). Click the button next to " Use NNUE" to turn it green. See if that helps.

Take racing kings, that isnt normal regular chess you see over the board. This is a variant

basically variants are anything except standard

I went to analysis board and I clicked on the three-line option ( I suppose but it's at the bottom-right corner not left).

But I didn't find a button with "use NNUE", how is it possible?

Thanks