The special sound of most Fusion players like Alan Holdsworth is partly a matter of the chords they use. That are either chords that are really wide or chords that have a whole or half step in them. Both sounds really interesting, but the chords are kinda hard to fret.
Here is an example of a chord progression that contains whole and half step chords. The whole and half steps are marked, so even if you can't read staff, you will be able to see them.