Watch the Em11 (EBDGAD) online guitar lesson by Vicki Genfan from Open Tuning Handbook: Rhythm
This is a minor chord with 2 added color tones: D (minor 7) and A (11), so we call it Em11. Like many chords in open tunings, this one has a sound that would be very difficult to get in standard tuning without a lot of stretching! Notice what kind of "mood" or feeling tone you get when playing it. It's one of my favorites. It's a beautiful tuning for playing songs in the key of E minor and if you use a capo, you can easily play in the additional keys of Fm, F#m, Gm, G#m, and even Am (5th fret capo).
In the etudes for this tuning, we'll be working in the key of D, where the Em11 is used as a ii chord. Take note the first level exercise is in 3/4 time signature. Level 2 adds another syncopated strumming pattern, and Level 3 gets more complex yet, with a strum that changes focus from the lower 3 strings to the higher 3 strings. This gives it more of a "rock" feel and requires more right hand control.
Note: For those who are CSN&Y fans (Crosby, Stills, Nash & Young), I believe this is the tuning used in the classic song, "Guinnevere".