This is one of a series of 30 caches related to popular board games past or present. In each case an Internet search will be needed to calculate the whereabouts of the cache, once you have solved the problem.
To bag this cache you may need to compromise, but I am sure you can work out detente far faster than it takes to play this strategic board game known for postal combat. If you know your ABC you will be well on the way to success as a start date (DD/MM/YYYY) and sadly, an end date, (DD/MM/YYYY) will be obvious.
Calculate DDMMYYYY+DDMMYYYY to get PQRSTUVW
The 35mm cache is not at the given co-ordinates, but can be found in the vicinity of
North (ST+U) (WV-QQ).(TQS+RQ)
East (SWV-VWT) (PT+R).(RUT-RPT)
You can check your answers for this puzzle on GeoChecker.com.