Play Black · 20 chapters

Slav Defense

A defence to 1.d4 d5 2.c4 with an active Bc8. Classical Slav, Exchange, quiet e3, Chebanenko and deliberate Semi-Slav transitions.

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Idea and repertoire boundaries

After 1.d4 d5 2.c4 c6 Black supports d5 without closing Bc8. This distinguishes the Slav from the ...e6 QGD. The course covers classical ...dxc4/...Bf5, Exchange and quiet lines, and Chebanenko’s ...a6. Semi-Slav structures are labelled as alternatives, London and Colle as repertoire deviations. You need not play every Black system in one session.

White’s plan

White tries to occupy e4 or recover c4 while developing. a4 restrains ...b5, Ne5 may recover the pawn with a knight and e3 develops quietly. In the Exchange, c-file activity matters more than pawn symmetry. Against ...a6 White may close with c5 and start flank play. Recognise this choice before automatically playing ...Bf5.

Black’s plan

Black develops Bf5/Bg4, completes mobilisation and prepares ...c5 or ...e5. The c4-pawn is often temporary: retaining it at the cost of king and centre is unwise. ...Bb4 pressures c3, ...Ne4 restrains e3-e4 and ...Nbd7 enables regrouping. Chebanenko’s ...a6 should support ...b5 or control b5/c5, not become a purposeless extra move.

Structures and pawn breaks

Classical ...dxc4 resolves central tension in exchange for active Bf5. After cxd5 cxd5 the c-file opens for both sides. Against c5 in the Chebanenko, Black undermines with ...b6 or ...e5 rather than chasing a blocked c5-pawn with pieces. Semi-Slav ...e6 closes Bc8; the Meran uses ...b5/Bb7 to release it, with its own dynamics and tactics.

Move order and tactics

Early Qb3 pressures b7 and d5. An active Bf5 does not justify leaving Ra8 undefended. Nh4/Nxg6 may open the h-file, Ne5 pressures c4 and the Geller’s e4/e5 accelerates an attack. In the sharp ...g5 line the decision depends on a concrete exchange sequence; do not import it into a quiet tabiya.

Transition to the middlegame and endgame

The Slav can lead to sound endgames, but passive rooks are more dangerous than apparent symmetry. Contest the c-file and knight outposts. If Bf5 was traded for a knight, keep a healthy centre and avoid opening play only for White’s bishop pair. After hxg6 reassess king safety. Lasting advantages come from activity and targets, not the defence’s name.

How to train this course

Learn the main a4/Bf5/e3 line, then Exchange and quiet e3. Compare the Qb3 replies because they occur in different structures. Chebanenko and Semi-Slav are optional second-stage systems. London and Colle chapters cover opponents who omit c4. At the end of each line explain how Bc8 becomes active and which exchange prepares ...c5 or ...e5.

Annotated variations

SAN: N — knight, B — bishop, R — rook, Q — queen, K — king.

1. Main line — Bf5 and Nbd7

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O Nbd7 9. Qe2 O-O 10. e4 Bg6

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
5... Bf5
a4 restrains ...b5. ...Bf5 develops the bishop before ...e6: the main benefit of having played ...c6.
10... Bg6
After e4 the bishop must respond. ...Bg6 preserves the diagonal while Black prepares ...c5 or ...e5. Do not concede the centre merely to retain c4.
FENr2q1rk1/pp1n1ppp/2p1pnb1/8/PbBPP3/2N2N2/1P2QPPP/R1B2RK1 w - - 1 11

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2. Main line — Ne4 and a central blockade

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Qe2 Ne4 10. Rd1 Nd7 11. Bd3 Ndf6

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
9... Ne4
...Ne4 blocks e3-e4 and seeks exchanges. It activates a piece rather than defending c4, which has already been returned.
11... Ndf6
...Ndf6 supports Ne4. Bxe4 Nxe4 changes the minor-piece balance; before ...c5 check the d-file against the queen.
FENr2q1rk1/pp3ppp/2p1pn2/5b2/Pb1Pn3/2NBPN2/1P2QPPP/R1BR2K1 w - - 9 12

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3. Krause — Ne5 and a quick ...e5

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 Nbd7 7. Nxc4 Qc7 8. g3 e5 9. dxe5 Nxe5 10. Nxe5 Qxe5 11. Bg2 Bb4 12. O-O

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
6. Ne5
Ne5 targets c4 and permits a knight recapture. ...Qc7 and ...e5 regain central space before White secures d5.
12. O-O
After the knight exchanges Black has an active queen and Bb4. White may develop Bc1 with tempo on the queen; arrange safe castling and control d4.
FENr3k2r/pp3ppp/2p2n2/4qb2/Pb6/2N3P1/1P2PPBP/R1BQ1RK1 b kq - 3 12

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4. Krause — ...g5 in a sharp line

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 Nbd7 7. Nxc4 Qc7 8. g3 e5 9. dxe5 Nxe5 10. Bf4 Nfd7 11. Bg2 g5 12. Bxe5 Nxe5 13. Nxe5 Qxe5

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
11... g5
...g5 attacks Bf4 and exploits temporary piece congestion. It is a concrete line, not general advice to push the g-pawn before castling.
13... Qxe5
After the exchange sequence Qe5 is active, but Ke8 is still central. Check safe Bf8 development and responses to e4 or Qd4.
FENr3kb1r/pp3p1p/2p5/4qbp1/P7/2N3P1/1P2PPBP/R2QK2R w KQkq - 0 14

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5. 6.Nh4 — doubled g-pawns

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. a4 Bf5 6. Nh4 Bg6 7. Nxg6 hxg6 8. e3 e6 9. Bxc4 Bb4 10. O-O Nbd7 11. Qe2

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
6. Nh4
Nh4 intends to exchange important Bf5. ...Bg6 permits hxg6, bringing the h-pawn inward and opening the h-file.
11. Qe2
Black has a healthy centre but a different king-safety problem from the h7 structure. Assess ...Qc7 and ...e5; castling short with an open h-file need not be automatic.
FENr2qk2r/pp1n1pp1/2p1pnp1/8/PbBP4/2N1P3/1P2QPPP/R1B2RK1 b kq - 4 11

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6. Geller Gambit — ...b5 and sharp play

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e4 b5 6. e5 Nd5 7. a4 e6 8. axb5 Nxc3 9. bxc3 cxb5 10. Ng5 Bb7

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
5. e4
e4 offers a pawn for a strong centre. ...b5 tries to retain c4, but a4 immediately attacks the chain’s base.
10... Bb7
After exchanges on c3 and b5 Black has b5/c4 pawns while White has active Ng5 and e5. Watch f7; retaining every pawn can cost king safety.
FENrn1qkb1r/pb3ppp/4p3/1p2P1N1/2pP4/2P5/5PPP/R1BQKB1R w KQkq - 2 11

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7. Without 5.a4 — b5 and an extra tempo

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 dxc4 5. e3 b5 6. a4 b4 7. Na2 e6 8. Bxc4 Be7 9. O-O O-O 10. Bd2 a5

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
5... b5
...b5 defends c4, but after a4 Black can gain a tempo with ...b4 against Nc3. This differs from the line where a4 preceded e3.
10... a5
Na2 is temporarily restricted but may return via c1/d3. Develop Bc8 and prepare ...c5; an edge knight is not necessarily a permanent weakness.
FENrnbq1rk1/4bppp/2p1pn2/p7/PpBP4/4PN2/NP1B1PPP/R2Q1RK1 w - a6 0 11

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8. Exchange — symmetry and bishop development

1. d4 d5 2. c4 c6 3. cxd5 cxd5 4. Nc3 Nf6 5. Nf3 Nc6 6. Bf4 Bf5 7. e3 e6 8. Bd3 Bxd3 9. Qxd3 Bd6 10. Bxd6 Qxd6 11. O-O O-O

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
3... cxd5
...cxd5 preserves symmetry and opens the c-file. Play ...Bf5 before ...e6 to avoid a passive bishop.
11... O-O
After both bishop pairs are traded, plan ...Rfc8 and active knights. The structure does not guarantee a draw: entry on c2 or a central mistake can still decide.
FENr4rk1/pp3ppp/2nqpn2/3p4/3P4/2NQPN2/PP3PPP/R4RK1 w - - 2 12

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9. Exchange — Qb3 and b7 pressure

1. d4 d5 2. c4 c6 3. cxd5 cxd5 4. Nc3 Nf6 5. Nf3 Nc6 6. Bf4 Bf5 7. e3 e6 8. Qb3 Bb4 9. Bb5 O-O 10. O-O

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
8. Qb3
Qb3 targets b7 and d5. ...Bb4 responds actively against c3; b7 defence needs tactical evaluation, not merely counting defenders.
10. O-O
Both sides exert pressure through pinned knights. Check Bxc6/Bxc3 and consequences for the d-pawns. Avoid leaving Ra8 loose after ...b6.
FENr2q1rk1/pp3ppp/2n1pn2/1B1p1b2/1b1P1B2/1QN1PN2/PP3PPP/R4RK1 b - - 5 10

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10. Exchange — Bg5 and active ...Ne4

1. d4 d5 2. c4 c6 3. cxd5 cxd5 4. Nc3 Nf6 5. Nf3 Nc6 6. Bg5 Ne4 7. Nxe4 dxe4 8. Ne5 f6 9. Nxc6 bxc6 10. Bd2 Qb6 11. e3

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
6... Ne4
...Ne4 offers an exchange and breaks symmetry. After ...dxe4 Black obtains an advanced pawn but must calculate attacks on Nc6 and the king.
11. e3
...Qb6 activates the queen, but ...f6 weakened e6/g6. Develop Bc8 and choose a safe king plan; do not push ...e5 while ignoring dxe5.
FENr1b1kb1r/p3p1pp/1qp2p2/8/3Pp3/4P3/PP1B1PPP/R2QKB1R b KQkq - 0 11

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11. Quiet e3 — Bf5 and Nh4

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. Nc3 e6 6. Nh4 Bg6 7. Nxg6 hxg6 8. Bd3 Bb4 9. O-O Nbd7

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
4... Bf5
After e3 Bc1 is shut in, but White can play Nh4. Black’s Bf5 needs a retreat route.
9... Nbd7
...Bb4 and ...Nbd7 pressure c3/e5. The h-file opened by hxg6 may help, but doubled g-pawns need protection in an endgame.
FENr2qk2r/pp1n1pp1/2p1pnp1/3p4/1bPP4/2NBP3/PP3PPP/R1BQ1RK1 w kq - 4 10

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12. Quiet e3 — Qb3 and Qc8 defence

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bf5 5. cxd5 cxd5 6. Qb3 Qc8 7. Bd2 e6 8. Na3 Bd6 9. Rc1 O-O

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
6... Qc8
...Qc8 protects b7 without retreating the active bishop. It costs a tempo, which requires prompt completion of development.
9... O-O
Na3 may reach b5 and Rc1 controls the open file. Develop Nb8 and connect the rooks; do not keep Qc8 tied to defence longer than necessary.
FENrnq2rk1/pp3ppp/3bpn2/3p1b2/3P4/NQ2PN2/PP1B1PPP/2R1KB1R w K - 4 10

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13. Quiet e3 — the ...Bg4 alternative

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. e3 Bg4 5. Nc3 e6 6. h3 Bxf3 7. Qxf3 Nbd7 8. Bd3 Bd6 9. O-O O-O

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
4... Bg4
...Bg4 develops with a pin. After h3 Bxf3 Black gives up the bishop pair for easy mobilisation, not immediate pawn damage.
9... O-O
Qf3 and Bd3 point at the king. Prepare ...dxc4 and ...e5 or ...c5 so White cannot attack the kingside without central concerns.
FENr2q1rk1/pp1n1ppp/2pbpn2/3p4/2PP4/2NBPQ1P/PP3PP1/R1B2RK1 w - - 5 10

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14. Chebanenko — 4...a6 against e3

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6 5. e3 Bf5 6. Bd3 Bxd3 7. Qxd3 e6 8. O-O Nbd7 9. b3 Bd6 10. Bb2 O-O

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
4... a6
...a6 prepares ...b5 but does not solve the centre by itself. Bf5 should develop before ...e6 in this version.
10... O-O
After Bb2 White pressures e5. Prepare ...b5 or ...e5, but first calculate cxd5/exd5 and the c-file consequences.
FENr2q1rk1/1p1n1ppp/p1pbpn2/3p4/2PP4/1PNQPN2/PB3PPP/R4RK1 w - - 3 11

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15. Chebanenko — the 5.c5 closure

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 a6 5. c5 Bf5 6. Bf4 Nbd7 7. e3 e6 8. Be2 Be7 9. O-O O-O 10. b4 Nh5

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
5. c5
c5 closes the centre and gives White space. Black can undermine with ...b6 or ...e5; ...a6 should support that counterplay.
10... Nh5
...Nh5 questions active Bf4. After exchanges assess the bishop pair and g6/f6 weaknesses. Avoid ...b6 if cxb6 leaves no satisfactory recapture.
FENr2q1rk1/1p1nbppp/p1p1p3/2Pp1b1n/1P1P1B2/2N1PN2/P3BPPP/R2Q1RK1 w - - 1 11

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16. Schlechter — the Slav fianchetto

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 g6 5. e3 Bg7 6. Bd3 O-O 7. O-O Bg4 8. h3 Bxf3 9. Qxf3 e6

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
4... g6
...g6 chooses a long-diagonal bishop instead of Bf5. It is solid, but d5 must remain defended against cxd5.
9... e6
Black may develop Nb8-d7 and prepare ...e5. Qf3 and Bd3 pressure h7; secure the king before opening the centre.
FENrn1q1rk1/pp3pbp/2p1pnp1/3p4/2PP4/2NBPQ1P/PP3PP1/R1B2RK1 w - - 0 10

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17. Semi-Slav — Meran as an alternative

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. e3 Nbd7 6. Bd3 dxc4 7. Bxc4 b5 8. Bd3 a6 9. e4 c5 10. e5 cxd4 11. Nxb5 axb5 12. exf6 gxf6

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
4... e6
...e6 shuts in Bc8: this is now a Semi-Slav, not classical Bf5. ...dxc4 and ...b5 gain a tempo against White’s bishop.
12... gxf6
After ...gxf6 the structure is highly concrete. Black has a g-file, advanced b5/d4 pawns and an exposed king; treat this as a separate sharp module, not the default setup.
FENr1bqkb1r/3n1p1p/4pp2/1p6/3p4/3B1N2/PP3PPP/R1BQK2R w KQkq - 0 13

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18. Semi-Slav — the Moscow Variation

1. d4 d5 2. c4 c6 3. Nf3 Nf6 4. Nc3 e6 5. Bg5 h6 6. Bxf6 Qxf6 7. e3 Nd7 8. Bd3 dxc4 9. Bxc4 g6 10. O-O Bg7 11. Ne4 Qe7

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
5... h6
...h6 asks Bg5 to decide. Bxf6 gives up the bishop pair but avoids the sharp gambits after Bh4 and ...dxc4.
11... Qe7
Qe7 removes the queen from Ne4’s attack. Develop Bc8 and prepare ...e5; Bg7 should influence the centre, not only defend the king.
FENr1b1k2r/pp1nqpb1/2p1p1pp/8/2BPN3/4PN2/PP3PPP/R2Q1RK1 w kq - 4 12

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19. Opponent chooses the London — active ...c5

1. d4 d5 2. Bf4 Nf6 3. e3 c5 4. c3 Nc6 5. Nf3 Qb6 6. Qb3 c4 7. Qc2 g6 8. Nbd2 Bf5 9. Qc1 Bg7

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
3... c5
Without c4 there is no Queen’s Gambit. ...c5 immediately challenges the London; this supplements the Black repertoire.
9... Bg7
...Bf5 gains a tempo on Qc2 and Bg7 reinforces the centre. Castle and consider ...e5; do not close lines with ...c4 without a follow-up plan.
FENr3k2r/pp2ppbp/1qn2np1/3p1b2/2pP1B2/2P1PN2/PP1N1PPP/R1Q1KB1R w KQkq - 4 10

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20. Colle — develop Bf5 before ...e6

1. d4 d5 2. Nf3 Nf6 3. e3 Bf5 4. Bd3 Bxd3 5. Qxd3 e6 6. O-O Bd6 7. Nbd2 O-O 8. c4 c6 9. e4 dxe4 10. Nxe4 Nxe4 11. Qxe4 Nd7

Why these moves? Annotations · 4
1. d4
d4 gives White space. Black can answer ...d5 and support the centre with ...c6 after c4.
1... d5
...d5 does not block Bc8. If White omits c4, recognise the London/Colle rather than forcing a Slav setup.
3... Bf5
...Bf5 uses the absence of immediate c4. Exchanging Bd3 removes an important attacking bishop before White opens with e4.
11... Nd7
After the central exchanges Black has a safe king and active Bd6. Prepare ...Nf6 with tempo on the queen and ...c5; a system opening does not require passive defence.
FENr2q1rk1/pp1n1ppp/2pbp3/8/2PPQ3/5N2/PP3PPP/R1B2RK1 w - - 1 12

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Check your understanding

Why 5.a4 in the main Slav?

It restrains ...b5, which supports c4, and helps recover the pawn while developing. It is not a king attack.

When does ...e6 change the defence’s plan and classification?

When it forms a c6-d5-e6 triangle with Bc8 still at home. That is a Semi-Slav and the bishop needs a different development plan.

Does a symmetrical Exchange guarantee a draw?

No. Activity, c-file control and tactical mistakes can still decide the game.

Scope and sources

MoveForge educational treatment. Names and initial sequences were cross-checked against public opening classifications; commentary and plan selection are original. These are 20 selected chapters, not every possible move or a claim to the latest engine theory.

2026-09-17