I introduced the "rolling lunacy" idea as food for thought, not really expecting it to be adopted. I've finally managed to produce a decent-looking graph (previous versions always came out blurry) of my progress from the beginning of 2017, the point at which I had sufficient data. I've projected to the end of June on the assumption I don't post another qualifying ride.
Possibly I could create a similar graph for the period 1985 to 1990; life took a different turn after that I lost some data when the desk diary containing a year's records was thrown away when preparing for a house move. The things marriages have to survive...
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I finally broke the 200km ceiling on September 19th with the 11th qualifying ride of the year; two rides from the previous October were still counting at that point, and by the time they'd slid out of view I'd completed 13 in 2019.
By the end of the year I had 15, one in each month with extras in July, September and October. What rolling lunacy boils down to is that you must keep ahead of a schedule based on your
last 13 qualifying rides in the previous year. In my case the first critical date was March 19th. My next ride is due by June 21st, and that's now unexpectedly under threat.
I think it's quite a spicy challenge, and not as complicated as it may seem. I think the best tactic is to make sure you put down a even spread of qualifying rides through whatever is your normal active season. A few extra rides will help as they'll create some leeway in the following year. If it provides an incentive to ride more, especially making the most of fine days in September and October, that can only be a good thing.