Basic Chart Series - Basic Guitar Bar Chord Chart. Easy to read diagrams with fingering chart. Bar chords, also referred to as Barre or Moveable Chords, are a type of guitar chord where the index finger is used to replace the nut of the guitar. When placed across the strings on the first fret, the index finger acts as a 'bar', which raises all the notes of an open chord up one half step. The notes on the open chord are played in the same position from the barred finger as it was from the nut!