Though nowadays one needs a calendar to tell one what day it is, that reminiscent thought plus the ever-present reminder that I am now in my eightieth decade led to a certain ponder. How good do we think So Doku is as a prophylactic to stave off Altzheimers and/or other evils of age? How does it compare to the Times Crossword or the Mephisto? Crosswords demand a wider range of skills, but So Doku perhaps more concentrated mental effort. Might be difficult to do a conclusive study, and I don't suppose anyone is volunteering to do that.
I have only been defeated twice (boast, boast!) by the Times So Doku since they started to publish, once mainly because of careless copying, the second (which I am more ashamed of) when I clearly had a blind spot towards my top right. How long can this continue I wonder?
Sorry to take up your attention with rather off-topic meanderings. I really ought to get out more.