It would greatly improve the forward and backwards step controls (for replaying the moves of the game) if their positions did not change when you click on them.

As it is now, it is not possible to position the cursor over the forward arrow and click sequentially through all the moves in the game. You have to move the cursor to find the arrow in its new position after every click.

If the forward and back arrows were instead anchored so that they did not change screen coordinates between steps it would be much easier to step through a game turn by turn.

As it is now, its such a pain because of this tiny detail that I never make it all the way through.