Chinups and Pullups

[wecoyote]

I don't know if this has been asked before. As SS described a symbiotic relationship between power cleans and deadlifts, does a relationship exist between chinups and pullups? Or stated another way, does the emphasis on arm involvment in chinups improve performance on pullups and vice versa?

[Mark Rippetoe]

They obviously benefit each other, but they are so similar that it is probably irrelevant.