Natural developing moves - Why should one actually shut in the dark-squared bishop with 4.e3 (Rubinstein Variation) when it could instead be actively developed to the g5-square, from where it pins the black king’s knight? This move is the starting point of the Leningrad Variation, and Boris Spassky and Jan Timman are its most prominent champions. The best reaction to the aggressive bishop sortie is considered to be active play against the d-pawn with ...c5, usually with a previous insertion of the moves 4...h6 5.Bh4.
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