PsychoPawn makes a good point. All it would take to make the interface very usable from an iPhone would be to put a set of navigate game buttons (of analyze game) along the right edge of the board and parallel to the board. Then you could enlarge the board to the point where you can see it and maneuver it, but still have access to those button. In fact, you don't even need all four of the buttons, just the back one move and forward one move buttons are needed. And while people may think this is just an iPhone issue, actually it is an issue for any device with a small screen available for the brower. And those will become more and more common.