The chord diagram for B diminished when you view the piano/guitar don’t make sense for the guitar. I don’t see how this could possibly be played with a human hand. 
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it’s for metal artists playing muted chords by barring on the 7th fret with your ring finger 
you can’t get more diminished than that…
Haha, the guitar voicings were created at a time where we didn’t show them to the public. There are chords in there which are even worse. I already have it on my list to fix them eventually, but this is lots of work so I couldn’t find the time yet.
Regards!
Dennis