Slav Defense

The Slav Defense begins when, after d4, ...d5, and c4, Black plays ...c6. The c6-pawn supports the pawn on d5, so Black keeps a firm central presence without moving the e7-pawn yet.

...c6 supports d5 without shutting in the c8-bishop

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Startc6

...c6 defines the Slav by supporting the center with the c-pawn and reserving the e-pawn for a later decision.

Black chooses the c-pawn to support the center

The Slav reply reinforces d5 without committing the e7-pawn yet.

1. ...c6 defines the Slav by supporting the center with the c-pawn and reserving the e-pawn for a later decision.

That difference matters. Because e7 remains clear, the c8-bishop can develop to f5 or g4 before Black plays ...e6. In many lines, Black first captures on c4, develops that bishop, and then builds a safe structure. Black may also support the captured pawn with ...b5 and gain queenside space.

The capture on c4 buys time to develop the bishop

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The black pawn on c4 gives up central presence but forces White to decide how to recover it.

The captured pawn creates a race between plans

Black decides whether to support c4 or use the time to develop the bishop before closing the structure.

1. The black pawn on c4 gives up central presence but forces White to decide how to recover it.
2. ...b5 can protect the c4-pawn and gain queenside space, although it also gives White a target.
3. ...Bf5 followed by ...e6 forms one plan: develop the bishop first and build a safe structure afterward.
4. a4 is White's characteristic answer to make ...b5 harder and facilitate the recovery of the c4-pawn.