I found this on the forums and think everyone should try it out:
There is a kind of practice which measures how well you know the coordinates of the chessboard by prompting you to click on the coordinate given in standard notation ( like E2, G5, C7 ) and your score is the amount of correct clicks within a given time. Tactics trainer is a common feature, but I have not seen such a training before. It is not as easy as you may think.
I wonder what your score is at this test:
I have tried it and my average is 8.16. I hope you try it and post your numbers on the forums.