Invalid FEN inserted - r1bqr1k1/pp1n1pbp/2pp1np1/8/2PNP3/2N3PP/PP3PB1/R1BQR1K1/
From Diagram (100), p. 261. Silman writes: "In diagram 100, Black should not even think of a kingside attack since there is too much play in the center, Instead, he should concentrate on strengthening his position in the middle by ...a5, ...Nc5, ...a4, and ...Qa5 with piece pressure on the White position."
My problem here is that it isn't clear to me what the Black Queen is doing on a5. I suppose there is some flexibility depending upon how White plays while Black is attempting this, but the author does say its purpose is strengthening Black's (central) position with piece play. Is the queen going to b4 to pressure c4 (and b2)? Note that the pawn on a4 might (depending on how White has developed) restrain b2-b3. How might White interfere with such plans? Assuming that Black gets everything into place as Silman suggests, if White then plays a3 to drive the queen away, does Black then play to open the b-file and put battery pressure on b2?