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It seems that White wants his Knight on g2 to support the advance of the f pawn so he
clears the square with g3. Black makes the ominous move of a rook to e8. White attacks
the advancd but isolated b pawn, and Black is obliged to defend it. Black does not wait for
White to advance his f pawn. It is time for the Black attack to begin in earnest. d5! The
Black Knight and Bishop will spring to life.   
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