Shubb Partial Capo C7
The Shubb partial capo C7 covers 3 inside strings.
It skips the outside string and covers the next three, either 2-3-4 or 5-4-3 (emulating DADGAD tuning)
Partial capoing is NOT the same as open tuning. If you're not clear on this concept, read more.
Read Todd's Shubb Partial Capo Review