Middle finger (2): press flat across the D string to the high E string at the 6th fret, a barre.
Index finger (1): 4th fret of the A string.
Don't play: low E string.
x46666 · A6 shape
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Strumming patterns to try
↓↓↓↓Four downsSteady, for learning changes
↓↓↑↑↓↑Folk / popThe everyday pattern
↓↓↑↓↑BalladSlow songs, 3/4 or 6/8
↑↑↑↑Reggae skankOff-beat chops
About the C♯6 chord
C sharp sixth is built from 4 notes: C♯ (1), E♯ (3), G♯ (5), A♯ (6). The lowest note you play should be the root, C♯, highlighted on the diagram. There are 12 ways to play it above, from the open position up the neck: start with the first, then pick whichever is closest to the chord you play before and after it.