hmm... but then speculative sacrifices of the Tal kind would be a real killer for the defender, unless you replied so fast that the attacker doesnt have enough time to glimpse the board and continue.
Well I was thinking of something like this:
-If it's not your turn you can't see the board
-If it is your turn you are allowed to look at the board for the amount of time it took the other player to make their move (w/o their move actually being shown). When that time is up (or you push a button) their move is made and the time starts counting down.