Board Thread:The Panopticon/@comment-4028641-20150828141837/@comment-2129700-20151022013337

Bwburke94 wrote: My personal belief is that a multi-Doctor story is one where multiple adult incarnations of the Doctor play a part in the narrative, and the reason for the appearance of multiple incarnations is not the Doctor's regeneration.

This is worded specifically to 'exclude Listen and the retro-regeneration stories, while allowing Deep Breath. I don't understand how the young First Doctor wouldn't count, unless if you're going by the idea that he wasn't "The Doctor" then, but that reasoning would also exclude the War Doctor.