>>Knowing the SCO took me from 800 to 1600.

Thats absolutely ridiculous and SCO is a poor reference anyway. There are a lot of good opening books that cover specific openings to ever rely on an a comprehensive guide anyway.

I'll a little confused that you claim to 'know' it. You reviewed the entire book even if you don't play certain openings or defenses? There is a lot better use of your time.

Hey, if it worked for you...it worked for you... but why does ever reputable chess coach advise the exact opposite?