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Black chooses to leave the central tension unresolved. Today, he would likely have deferred
development of his Kingside Bishop in favor of immediate development of the Queenside
Knight to d7  and on to e5 , as in the game, or perhaps b6.  In the game Fischer commits to two
pawn moves to prevent the Knight front establishing a post on b6. Note that castling Kingside
by Black at move 10 or 11 is out of the question (for now) as White could take the pawn at c6
with a disclosed check. Meantimes, Black is massing pieces with the idea of an invasion at g4.   
9. d5 Be7
10. a4 Nbd7
11. a5 Ne5