Does anyone know a site where I can type the moves with keyboard, hide the board and only see the score sheet?
I want to play blindfolded. I used to play a lot but I want to play online.
In addition to the other answers, lichess allows you to do this.
Select the menu (three stacked lines to the right of your profile name), select Preferences, select Game Display, and at the bottom turn on Blindfold Chess.
Try https://www.tryit.in/blindchess. It's a very simple interface where you can play against an engine at different difficulty level by just keying in the moves in algebraic notation and see the board as and when you want. Full disclosure: I am the tool developer! :)
This is a bit late but in case you are still looking, we've been working on our blindfold chess website for the past few months and just released our beta. The main game is exactly what you describe: you can play by entering PGN moves while viewing the score sheet. The board is hidden and you can choose after how many moves you will be able to view the board.
We're building the entire website to help with blindfold chess. We have mini games to help learn PGN, a memory trainer, a tactics trainer that forces you to think of all the moves (you and your opponent's) in your head, and the main game, which is just classical chess.
Let us know if you have any feedback! Hope this helps you :)