The core philosophy is that women should be "easy to be with but hard to get". It emphasizes that men are "hunters" by nature and will value a woman more if they have to pursue her.
The book (Russian: "Правила" ) by Ellen Fein and Sherrie Schneider is a famous dating guide first published in 1995 that advises women on how to attract and marry the man of their dreams. Overview of "The Rules" kniga ellen fein pravila skachat