bhf3737 - it's your photo and you can call it what you want
!
My points for the Solitary Sandpiper:
1. The back and the wings on your photo are to red-brown for an Yellow legs. The spots are to uniformly rounded/colored.
2. The flank feathers that cover partially the wings are to white (in the case of the Yellow legs you most probably will have some darker spots there)
3. The legs are not "yellow enough"
: it depend on how muddy they are but your bird looks pretty clean. The Yellow legs have brighter yellow on the legs.
4. The bill of your bird is little bit shorter and ticker for Yellow leg. The base seems to have some greenish tint (not present in the Yellow legs) but I would agree that it is not always and easily visible. The upper mandible of your bird has that lighter (yellow-green) line and I don't think it's because of the exposure - it is not "bleached". The Yellow legs have dark upper mandible.