For those of you who are interested in this sort of detail...
While playing NSUD on my computer, I ran across an interesting "rare
exception" hand that I had never seen discussed anywhere before. It
surprised me, because I thought my strategy chart for this game
covered all of the exceptions, but I guess not quite 
In 16/10 NSUD, a [2] with two Royal cards containing an ace is
generally better than a [2] with a two card straight flush WITH a
gap. I thought that this was always the case, until this particular
hand came up in practice:
[2] AT8s + K
If you hold the [2]ATs you get a "statistical error". It is better
to hold [2]T8s by about 1 cent on a dollar game. I started checking
around and was able to find one more hand similar to this one:
[2] AKs + T8s
Again with this hand, the [2]T8s is better by about one cent. In
both hands there is a straight penalty card to the Wild Royal draw,
but there is not a straight penalty to the SF draw. These are the
only two hands I could find like this, but if there are any more,
perhaps someone will post what they are.
EE