[Yardstick]

True you can do one finger power chords if you use non-standard tuning but that’s a special case. I don’t think that’s what the writer is talking about.

Keith Richards is known for using open G tuning on certain songs and removing the low E string altogether. That is, he plays with only 5 strings.

Drop D tuning where you lower the E string a step lets you do one finger power chords, but I don’t think Keith Richards is known for doing that. Do you know a song where he uses drop D?

[T.B. Yoits]

I only added to the confusion. It would be much easier to post pictures of alternate tuning chord diagrams that show the same fret power chords.

Keith Richards plays a lot in Open G tuning (D-G-D-G-B-D).

With that tuning, the E and A strings are tuned a fourth apart and allow for "typical" power chords on adjacent strings two frets apart. The A and the D strings are tuned a fifth apart and allow for power chords on adjacent strings on the same fret.

[Chode]

“Ah, the five string guitar: it’s five strings, three notes, two hands and one asshole.”