This is a series of puzzle caches based upon the UCI World Tour. Each puzzle builds on the next and they will get increasingly more challenging as you progress through the series. The puzzles will lead to a trail of caches along official cycle routes and therefore are best done by bike. The caches are small and will not contain swaps but could cope with a small TB or geocoin.
The La Flèche Wallonne traditionally finishes on the infamous Mûr de Huy climb. The gradient on the Mûr de Huy reaches a brutal AB% at it's steepest point. There is a house on the bends at this point with two words written on the front. The second word has 6 letters CDEFGH. The word Huy is written on the climb XYZ times.
Subtract G from the Northing for Stage 16.
Subtract (C-A)(B-E)(D-B) from the Westing for Stage 16.
N.B. A=2 and B=7!
You can validate your puzzle solution with certitude.