This morning I engaged in the kind of obscurant placing move of which I rarely get the chance to assay. The constraints being that:
I need to have a bicycle at Churchill to get home with this evening (unless I want to walk).
I want to minimise the amount of effort expended.
I have a Megarider ticket this week, so the incremental cost of bus travel is zero.
With this in mind I cycled to Churchill, and left my bicycle there, then walked a short distance to Madingley Road where I caught a number C4 bus.
Now, my original sketch of a plan was to stay on the C4 until its route intersected that of the 99Cowley Road Park and Ride, but I decided that it would be faster for little extra effort expended to get off at Pembroke and walk over to Drummer Street. At this point I could get on a 99Cowley Road Park and Ride bus that takes me (practically) to work.
This story fails to demonstrate the third perl virtue of routefinding.
 A placing move is typically one made to facilitate an expected future journey.  Over distance the bus is less effort than cycling is less effort than walking. This reverses for suitably short journeys.  "Laziness".  A 77Newmarket Road Park and Ride Bus would be a lot more convenient here, but it doesn't appear to stop on this segment of Madingley Road. I even got the chance to try this experimentally this morning.  "Impatience".  "Hubris".