This series comprises four traditional caches, each of which
contains a ten digit number. Any three of these numbers provide
enough information to find the bonus cache - which three will you
choose? The numbers are labelled A, B, C and
D, and sum to 10,000,000,000: the tenth root of a googol.
The grid reference of the final cache (in grid square SP) can be
calculated as A – B + C – D.
A quincunx is an arrangement of five dots as seen on the
fifth side of a playing die, with one at each corner of a square,
and one in the centre. It is named after the Roman coin worth five
twelfths (quinque + uncia) of an as,
emblazoned with that pattern.
This cache is near a level crossing on a little-used footpath
which crosses a local golf course. The public right of way goes
right next to the green for the second hole, hence the name of the
cache. An approach from the west may seem closer, but I'm pretty
sure there's nowhere to stop along that road. Keep your eyes peeled
if you visit at twilight; badgers have been seen on the golf
course. The cache is not located on railway land, so having crossed
the railway, don't hesitate to cross the stile. The container is a
small pot with a "childproof" lid (push and turn to open), and a
small pencil inside. The number for the bonus cache is on the
inside of the lid.