Root on A string
no fifthx4343x
C♯7♭9 is the C♯ dominant 7 flat 9 chord. Its notes are C♯, E♯, G♯, B and D. It is the same chord as D♭7♭9. A compact four-finger grip without the fifth. Try it as V in a minor key.
x4343x
Numbers show frets from the low E string to the high e string; x means don't play that string.
Every C♯, E♯, G♯, B and D on the first 12 frets. The filled dots are the root, C♯. Build your own shape from any nearby group.
Other C♯ chords
Other dominant 7 flat 9 chords