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→Open Position B Diminished
You'll need to use your ring finger to mute the 3rd string when you strum this chord, so you don't hear the open G string. Diminished chords tend to have pretty nasty shapes, and even vanilla B dim is no different. If it's difficult, you can drop the high F with the index finger.
== Harmonic Function: Leading Chord ==
B dim is diatonic to the key of C Major, using its 7th scale degree as the root note. Thus, it is called the vii or vii° chord. The ° indicates diminished, but you have to be careful - we are dealing with the diminished triad here, not the diminished seventh. The Diminished 7th chord has two variations - half and full. Half is indicated with a slash through the ° symbol.
The vii chord is called the ''Leading Chord''. Harmonically, it has a dominant function.