Chess as diagnostic tool


I have to apologise for disappearing for a short while. I have had a few health issues which have laid me low and more importantly have interfered with my chess!

One interesting thing I have noticed is that when I have been poorly my play online has suffered accordingly. Some times it has seemed I have barely been able to make legal moves – certainly falling victim to simple cheapos. On the other hand when I play acceptably then I am feeling a bit more with it…so chess as a diagnostic tool?