One of the most difficult operations to judge in chess is the soundness of a pawn-sacrifice. When the opportunity arises to make a heavier material investment it is normally obvious whether or not there will be a definite minimum compensation, but with the pawn sacrifice there is often a thin borderline between "good chances" and "fizzling out". The feeling for these matters is extremely delicate and Alekhine was an adept at finding precisely the correct moment for a pawn sacrifice to energize his own position.
An illogical move which Alekhine thoroughly castigated in his own notes, giving instead 10...QXN! 11 P-QR4 Q-B3 12 N-R3 P-K3 13 P-R5 N-Q2 14 N-N5 •.
White's lead in development made Black's position critical, hence Reshevsky's decision to return the pawn in the interests of decreasing the pressure.
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