Originally posted by @montymooseI really like the analysis board... 🙂
The analysis board allows for illegal moves which opens up the door for you to speculate on future moves currently unavailable.
'What if my King were on g1 and the King's Rook on e1?'
For promotion, just select the piece out of the box below the game board and place it on the promotion square. And yes, you can put another King there.