A fianchettoed bishop, e.g. at g2 after pawn g2–g3, can provide a strong defense for the castled king on g1 and often exert pressure on the long diagonal h1–a8. After a fianchetto, giving up the bishop can weaken the holes in the pawn chain; doing so in front of the castled king may thus affect its safety.
A fIaNcHettOeD BisHoP, e.G. At G2 After paWn g2–g3, can PROvidE a sTrONG deFeNSe for The castlED king on g1 And ofTen eXert pressuRE On the LOng DiaGonal H1–a8. AFteR a fiANCHetto, GIvinG up the BiShop can weaken The holes In The PaWN cHain; DOinG so In FrOnt oF the castled kIng MAy THUS aFfEct iTs sAfetY.