Struggled for an hour, went to bed unsolved. Felt like an expert but in the end simple hidden singles and doubles broke it, but very hard to spot in the beginning in a sea of greens. Very nice solve for u w/o using visual aids, Doc. That's why you're the Doc. G, NG.
Did it! No green. No guess. Wow! That one had some six difficult loners that worked off of virtuals. Never seen anything like it. I'm so glad I persisted.