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.
The cache is on a little-used footpath near Water Eaton.
Although the public right of way ends before the road, a permissive
path exists linking Jordan Hill with St. Frideswide Farm and the
other footpaths. On a clear day, and depending on which way you
approach, you will have views of Water Eaton Manor, and the
WWII-era grain silo beside the former Oxford Road railway station
where the modern Park and Ride lies. The cache is a small
camouflaged clip-lock box, and includes a small mechanical pencil.
The number for the bonus cache is on the inside of the lid.