Usually a catastrophe in the opening happens when a king stays in the centre and the position opens quickly with a timed sacrifice. Here we have one uncharacteristic example. In the Nimzo-Indian Defence Black early castled and had quite satisfactory position. In the closed type of the position one could expect a lengthy maneuvering battle. But Black wanted more and unreasonably sharpened the battle in early stage of the game. An overoptimistic approach and a lack of alertness brought him troubles quickly.
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