Bi Qiang Zi Bao

9. Bi Qiang Zi Bao? （彼强自保） - Take precautions against the opponent's strength

This proverb refers to mamori, meaning pre-emptive defence, rather than ukeru, meaning purely reactive defence. Ishida's joseki dictionary] describes in the following diagram as mamori.

Mamori  

protects against an invasion at a. After a long discussion of the variations that arise as the result of this invasion, Ishida writes that defends against it. If White nevertheless invades at a, Black responds with b.