[ECO code D55]
(to) Petrosian Variation
White's dark Bishop removes Black's knight on KB6(f6) to eliminate its control of White's K4(e4), and invites an exchange. W-Alt.
White Black White Black 1. P-Q4 P-Q4 6. Kt-B3 P-KR3 2. P-QB4 P-K3 7. BxB 3. Kt-QB3 Kt-KB3 4. B-Kt5 B-K2 5. P-K3 0-0
BLACK to or Undo or Jump or Clear
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