Fighting does not work at all in Aikido.
Thought I'd post a thread to counter the 'other' one. In fact the title should be held as a set mantra for all Aikidoka.
Being in essence a spiritual discipline of universal harmony, following such principles of absolute non-resistance it is ultimately unfightable.
The hidden attraction is spiritual, the final understanding is spiritual. The basic tenets are of there are no opponents in true Aikido.
So on the subject itself there can be no fighting at all in Aikido.