Chess Board
[ECO code D13 > D14] Move Move Here
(The) Exchange Variation

White's QBPawn on QB4(c4) removed Black's QP on Q5(d5) and invited exchange capture.
Black's QB3(c6) Pawn takes the new doubled QP to set a fixed centre of mutually blocked pawns - a "main" route to the position since ECO coding.
     White   Black
 1.  P-Q4    P-Q4
 2.  P-QB4   P-QB3
 3.  Kt-KB3  Kt-KB3
 4.  PxP     PxP    Alt. 3WB,2WB route

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