How can I play a C diminished chord on the guitar?

To play a C diminished chord on the guitar, place your index finger on the 9th fret of the 6th string, your ring finger on the 11th fret of the 5th string, and your middle finger on the 10th fret of the 4th string. Strum all six strings, making sure not to play the 1st, 2nd, and 3rd strings.