Watch the No Guide Back online guitar lesson by Brad Carlton from Chord Studies: Slash Chords Vol. 2
These four chords all have B in the bass. Our first chord is Bm, which you'll notice comes right out of your Am form with an omitted fifth string. Rotate your hand and squeeze the second and third fingers in there to get the A/B. Your second finger will act as a guide when going to the G/B, and your fourth finger will be a guide when going to the E / B. To start over, you simply move back down to Bm, but this time there are no guide fingers. Try hybrid picking this for a keyboard-type sound.