Weedwhacker said:RpR -- could you be more specific as to what kind of potatoes didn't work out that way? And how you did cook them successfully?
The way I found out first, was a site called the Kenosha Potato Project which lists many potatoes and a comment, sometimes on what they are good and not good for.
After that I started reading many sites on potatoes, I cannot give you links as it was read and not save.
I spent hours, and I mean hours, searching the net for information on potatoes, what was out there and how to get them.
Some are available for a short time and then pffft. you cannot get them.
I probably spent over 300 dollars on seed potatoes in the past five years or so just to try different ones and see how they cooked up.
You simply learn that if you want boiled potatoes, most work but a few do not, so do not use certain ones for boiling, just as some potatoes are not the best for baking, french frying etc..
I would give the KPP a look see.