Extraordinary Success
If the character has at least rank 10 in a skill and beats the DC by 20 or more on a normal skill check, the character has completed the task impossibly well.
Quite right. But there is such a thing as extraordinary success (and practically impossible tasks). You have to have a rank of 10 or more in a skill and beat the DC by 20 or more to achieve this. That is explained in the PH on page 61.RogueJK said:By the rules, there's no such thing as a critical success or failure on skill checks. A 1 is merely a 1, and a 20 is merely a 20.
Critical successes and failures are only for attack rolls and saving throws.