Can you play chess blindfolded

Maybe up till the first 15 moves

Yes, maybe 4 moves.

Sure.

I can play an entire game blindfolded. But I don't play often.

#3 how do you memorize an calculate all those moves in your head?

Yeah

yes, ma be 2, 3 moves.

I can play at my normal strength for about ten move because of a few moves of theory and opening understanding and then a bit more of knowing everything in the position and then I play worse and worse positionally as my understanding of the position gets worse and then by move 20-25 I start to forget stuff and blunder

Yes I use to do it on stream against some viewers. Its actually not as difficult as some make it out to be. I think memorizing stuff towards the end of the game gets pretty tricky also if people play unconventional moves its quite hard for me. The best way to see if you can do it, is to try it.