Sweetcorn

Super sweet and extra tender types are sh2. Swift is extra tender so sh2. DT Browns/Mr Fothergills do say you can grow Picasso with any other type but I'd trust Johnny Seeds, who supply seed direct to farmers, more than them.

I guess you could grow something like Minipop which doesn't require pollination.

Johnny say you can grow incompatible varieties if you stagger planting dates by 12 days or grow varieties which will mature at least 12 days apart, but you still need to separate varieties by 25 feet in each case.

Thanks TMTT.  I have started off many years ago with false info from Garden Focused that Swift was se/se+, not sh2.  Not that it really mattered as I've only grown extra tender types together.  I will now rethink my strategy.  I can probably manage 25ft distance  and a 12 day+ difference is easy.  Like you I've more faith in Johnny's Seeds than the others.
Don't we gardeners get fed some rubbish!  
Not bothering with Minipop, to my mind it's not worth it, I like my big cobs.  I will experiment with Picasso and hope for the best.