lol, I coined that name a few years back to describe some I had with solid black side spots. It sure did catch on!!
IMO it certainly needs to be more than just one spot lacking a crescent top. IMO it should be one or more of the following with the more it has the higher the "grade" eclipse....
1) Solid black side spots with no crescents (duh) the more the merrier.
2) For those spots that do have crescent color at top, minimal, even broken crescents, maybe only a scale or two. The less light area the better.
3) One of my more extreme Eclipse's (Amber) has lighter blushing towards the middle, not sure if that's a plus or minus when talking Eclipse.
4) By definition we are talking about the upper row of side spots. Many BRB's display a second row of latteral spots, typically with NO crescents and sometimes not full circles, blending into belly area.
Amber:

Amber as a baby:

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Thanks,
Dave Colling

www.rainbows-r-us-reptiles.com
0.1 Wife (WC and still very fiesty)
0.2 kids (CBB, a big part of our selective breeding program)
LOL, to many snakes to list, last count:
26.49 BRB
20.21 BCI
And those are only the breeders 
lots.lots.lots feeder mice and rats 

