Chess Board
[ECO code D31] Move Move Here
QUEEN'S GAMBIT - Petrosian Var.
Exchange Variation

White's King's Pawn push out to K3(e3) (behind his dark bishop) supports his QP+B and frees his KB.
Black develops his Queen's Bishop to KB4(f5) contesting White's K4(e4).
    White  Black	White  Black
 1. P-Q4   P-Q4	     6.	P-K3   B-KB4
 2. P-QB4  P-K3
 3. Kt-QB3 B-K2
 4. PxP	   PxP
 5. B-KB4  P-B3

WHITE to Move or Undo or Jump or Clear
 
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