I noticed alot of people mute the A string when playing this chord. The A is the 5th of the Dchord so why not add and play all 6strings is it because it makes the chord a little muddy. The reason why i bring this up is because i have small hands so its hard for me to wrap my thumb around to play the F# on the 6th string and mute the 5th string. I play the D/F# chord with all six strings.