For a board with ChessLink built in to behave just like the other boards, it's driving me mad!!

Having said that I can't reproduce the problem with whose side to move it is when the board is rotated. I set up a rotated position with black to move and made some moves, then reset it (still rotated) with white, then reset it un-rotated with black to move then with white to move. I suspect the problem is that Shredder only send the piece positions to my driver, while LucasChess sends a full FEN. So on my screen when asked for a position you need to make sure the side to move indicator is set correctly, while for LucasChess it will automatically be set. The side to move is set on my screen using the button with a two-headed arrow.

I can't reproduce the underpromotion problem either. When you lift up the pawn to move, the three LEDs flash and you select which piece to underpromote to. If you press one it underpromotes OK and if you don't you get a queen. It seems to be working for me in Shredder. If the problem is in Arena let me know and I'll test that too but of course that takes longer as I can't set up positions there!

PS. I have added the German letters to the allowed promotion pieces to fix the problem with Arena! I couldn't do the "English-Russian" letters as my English windows wouldn't show me what they are. Right now, to be honest, I couldn't care less about supporting Russian characters.