I'll compile a list of difficult hands that folks can try to solve. You can then specify the game number and know that you're playing exactly the same deal that another person wrestled with. The number following the hyphen is the difficulty level of the game. This parameter is used to bias the deal algorithm to yield, on average, easier or harder hands. Note that this doesn't guarantee that games will always be easier or harder as expected.
Distribution can still have a lot to do with the challenge of solving a hand.
But on average you'll find it seems to work. The difficulty level parameter affects the layout of the deal just as much as the hand number. Hand number 14622 played at difficulty level 6 will be a different hand than 14622 played at any other difficulty level. So it is important to note both the hand number and the difficulty level if you want to recall a hand for later replay. This is to prevent someone from running up a big streak by playing the same game over and over again.