
ChessBase is a personal, stand-alone chess database that has become the standard throughout the world. Everyone uses ChessBase, from the World Champion to the amateur next door. It is the program of choice for anyone who loves the game and wants to know more about it.
In the position below black's pieces lack coordination, but more serious are the weak black squares around the black king, which is very vulnerable. Petrosian brilliantly exploited these factors.
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