I'm a Geocache, get me out of here - 4 BGW Mystery Cache
I'm a Geocache, get me out of here - 4 BGW
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Difficulty:
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Terrain:
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Size: 
(small)
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in our disclaimer.
The cache is held captive at the given coordinates but you can release it with the help of some numbers.
There's an inscription not far from the cache - John Hobart died on x September 1yz3.
Your number is x (y-2) (z-2) square root(y+z)
Blickling Great Wood is a series of 11 caches in the woods and paths to the North West of Blickling Hall. Our thanks to the National Trust for permission to place the caches.
In season, please avoid treading on the bluebells as far as possible. BYOP.
Car parking (pay and display but free for NT members) is available at either of the two locations given below.
Additional Hints
(Decrypt)
Zbffl gerr arne jbbqcvyr.
Abj, jurer jbhyq gung vafpevcgvba or?