Bottomless Bin Mystery Cache
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Difficulty:
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Terrain:
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Size: 
(small)
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The cache is not at the listed coordinates! But the bin is! To find the cache - you will need to solve the puzzle below!
Walk along this part of the Centenary trail, and you will come across the bottomless bin! Just like a bottomless glass, a bottomless bin can never be filled! At GZ you will find such an amazing thing! Decades ago, there was a wonderfull picnic site here - along the long forgotten highway... And, just like all picnic sites - there were bins. However, the council became tired of emptying the bins, so bottomless bins were invented! These bins have not needed emptying in many years! Alas, the BBQs, toilets and shelters have long gone - but at least the bottomless bins remain 
I came home the other day, to find my son playing chess with a friend! Now, although I know how to play chess, I wouldn't say that I am very good. So when I saw the chessboard - instead of noticing who was winning, I immediately saw coordinates in my mind! (My geocaching must be better than my chess)! That's it I though - the perfect location for a cache.
Checksums:
S = number of links in chain holding bin lid + 5.
E = number of links in chain holding bin lid x 2 - 5.
Please BYO pen!
Additional Hints
(Decrypt)
Tebhaq yriry