I play a little "blindfold chess" (without sight of the board) and would
like to improve my play.

I have noticed that I have two problems.

After about twenty moves, I can still remember where the pieces are, one at
a time. However, I cannot see the whole board in my head. What I mean is,
I have trouble seeing the pieces relationships to each other. I could set
up the current position on a board. Does this make sense?

Also, I have trouble "seeing" diagonals. My opponent will move a bishop or
queen, and I will have to figure where it can move diagonally (one square at
a time).

Does anybody have any suggestions or comments?

Matthew