Hello Bob,
I was taught the 'piano' chords which I use to this day on my KN7 with the BASS NOTE set to 'On'. This clever keyboard sorts out the relevant rhythm by using my bass note as a guide whatever it is, so to be honest I wouldn't know whether I'm using a diminished chord or not but what I do know is, without the 'BASS NOTE' activated, my 'piano' chords sometimes clash with the style I'm using making the whole thing sound discordant.
I really must learn to use the correct keyboard chords. Old habits die hard I'm afraid - but I get away with it - most of the time that is.
Audrey