When do I use V for Ü in Pinyin programs I use a program called Sougou, which is very poopular in China I think. Sometimes I use the Microsoft pinyin language option.

Sougou is very good at guessing my characters based on context, but sometimes I have to click through to find my character, especially when it's character with  ü it seems.


Is there a standard rule here? Should  ü always be replaced with v in pinyin programs?
What about after the J, Q, X and Y letters where  ü is always implied, should I be hitting V or U on my keyboard?


Sorry for the simplistic question, I wish I could understand the sougou documentation, but it's still "chinese" to me. Thank you.
In the past (e.g. 80's to 90's), when the Chinese IME did not implement fuzzy logic, the rule was you should use v for and only for ü as you would write on paper. For example for J you should type ju not jv.

Now all the mainstream Chinese IME (MSPY, Sogou, Google Pinyin, etc.) has fuzzy logic built-in and enabled by default. This question isn't much relevant anymore.