Ruy Lopez, Exchange Variation

The Exchange Variation arises after 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6. White gives up the light-squared bishop for the c6-knight. After the usual 4...dxc6, Black's d7-pawn lands on c6 beside the c7-pawn. Two same-colored pawns on one file are called doubled pawns.

4.Bxc6 trades an active piece for a structural advantage

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StartBxc6dxc6

The attack on c6 allows White to alter Black's pawn structure instead of retreating the bishop.

The bishop can retreat or exchange

After 3...a6, White decides whether to preserve the bishop or trade it for the knight that helps defend e5.

1. The attack on c6 allows White to alter Black's pawn structure instead of retreating the bishop.

The exchange gives each side something. White has removed a defender of e5 and gained a long-term structural target. Black keeps both bishops, known as the bishop pair, and opens the d-file for the pieces. The bishop pair can become especially valuable after pawns are exchanged and diagonals open.

The e5-pawn is not immediately free

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StartNxe5Qd4

The pressure on e5 only wins material if White can also answer Black's queen entry.

Removing the knight makes e5 look vulnerable

White's knight attacks e5 and the c6-defender is gone, but Black's open queen route changes the calculation.

1. The pressure on e5 only wins material if White can also answer Black's queen entry.

A classical White plan is to exchange Black's e5-pawn and reach an endgame where a four-against-three kingside pawn majority can create a passed pawn. A passed pawn has no enemy pawn on its file or a neighboring file that can stop it directly. This plan requires favorable exchanges: the pawn structure does not win by itself, because Black's active bishops can provide enough compensation.

By playing 4.Bxc6, White leaves many main branches of the Ruy Lopez, including the Closed Ruy Lopez and the Open Ruy Lopez. The result is not automatically simple. Decisions about d4, development, and piece exchanges determine whether the game becomes strategic or tactical.