[ECO code A81]
(to) Leningrad System (main)
Black develops his King's Knight to KB3(f6) to double his control of K5(e4), set to permanently prevent an advance of White's KP. The modern-day Leningrad System pioneered by three Leningrad players was popularised by Viktor Korchnoi (third best world player in the 1970s). B-Alt.
White Black 1. P-Q4 P-KB4 2. P-KKt3 Kt-KB3
WHITE to or Undo or Jump or Clear
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