Semi-Slav Defense


Semi-Slav Defense
Semi-Slav Defense
Solid white.svg a b c d e f g h Solid white.svg
8  black rook  black knight  black bishop  black queen  black king  black bishop  black king  black rook 8
7  black pawn  black pawn  black king  black king  black king  black pawn  black pawn  black pawn 7
6  black king  black king  black pawn  black king  black pawn  black knight  black king  black king 6
5  black king  black king  black king  black pawn  black king  black king  black king  black king 5
4  black king  black king  white pawn  white pawn  black king  black king  black king  black king 4
3  black king  black king  white knight  black king  black king  white knight  black king  black king 3
2  white pawn  white pawn  black king  black king  white pawn  white pawn  white pawn  white pawn 2
1  white rook  black king  white bishop  white queen  white king  white bishop  black king  white rook 1
Solid white.svg a b c d e f g h Solid white.svg
Moves 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6
ECO D43–D49
Parent Queen's Gambit
Chessgames.com opening explorer

The Semi-Slav Defense is a variation of the Queen's Gambit chess opening, defined by the position reached after the moves:

1. d4 d5
2. c4 e6
3. Nc3 Nf6
4. Nf3 c6

The position may readily be reached by a number of different move orders. With Black advancing pawns to both e6 and c6, the opening resembles a mixture of the Orthodox Queen's Gambit Declined and the Slav Defense.

With 4...c6, Black threatens to capture the white pawn on c4, and hold it with ...b7–b5. White can avoid this with 5.e3, though at the cost of restricting the dark-squared bishop from its natural development to g5. Alternatively, White often gambits a pawn with 5.Bg5, the Anti-Meran Gambit, which Black may accept with 5...dxc4 6.e4 b5, leading to sharp play, or decline with 5...h6, the Moscow Variation. If Black plays the latter variation, White can play 6.Bxf6 Qxf6, ceding the bishop pair in exchange for a lead in development and a freer game, or again offer a gambit with 6.Bh4!?

For the Semi-Slav the Encyclopaedia of Chess Openings designates codes D43 through D49.

Contents


Main variations

About 80% of games continue 5.Bg5 or 5.e3. Other possible moves are 5.cxd5 and 5.g3.

5.e3

The main line continues with 5.e3, when Black usually develops with 5... Nbd7; though a bishop move 5...Bd6 or 5...Be7 is seldom seen, as masters realized early on that at e7, the bishop was passively placed and does nothing to further one of Black's aims, the freeing move ...e5. The unusual move 5...a6 appears solid for Black.

Meran Variation

The main variation of the Semi-Slav is the Meran Variation, 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5, (ECO codes D46 to D49), when play usually continues with 8.Bd3, with 8.Be2 and 8.Bb3 less common alternatives. The line was first played in 1906 in the game Schlechter–Perlis.[1] The variation takes its name from the town of Meran (Merano) in northern Italy. During a 1924 tournament in Meran, it was used successfully in the game Gruenfeld–Rubinstein. Gruenfeld adopted the same variation two rounds later against Spielmann, winning as well.[2] Viswanathan Anand won two games with Black in his World Chess Championship 2008 match with Vladimir Kramnik. Black surrenders his outpost on d5, gaining a tempo for queenside space expansion by ...b7–b5. White will play in the center, leading to a rich, complicated game. These opposing strategies, with the ensuing keen play, have long made the Meran a favorite for enterprising players of either color. An example is Gligoric v Ljubojevic, Belgrade, 1979.

Anti-Meran Variation

Solid white.svg a b c d e f g h Solid white.svg
8 a8 black rook b8 black king c8 black bishop d8 black queen e8 black king f8 black king g8 black king h8 black rook 8
7 a7 black pawn b7 black pawn c7 black king d7 black knight e7 black king f7 black pawn g7 black pawn h7 black pawn 7
6 a6 black king b6 black king c6 black pawn d6 black bishop e6 black pawn f6 black knight g6 black king h6 black king 6
5 a5 black king b5 black king c5 black king d5 black pawn e5 black king f5 black king g5 black king h5 black king 5
4 a4 black king b4 black king c4 white pawn d4 white pawn e4 black king f4 black king g4 white pawn h4 black king 4
3 a3 black king b3 black king c3 white knight d3 black king e3 white pawn f3 white knight g3 black king h3 black king 3
2 a2 white pawn b2 white pawn c2 white queen d2 black king e2 black king f2 white pawn g2 black king h2 white pawn 2
1 a1 white rook b1 black king c1 white bishop d1 black king e1 white king f1 white bishop g1 black king h1 white rook 1
Solid white.svg a b c d e f g h Solid white.svg
Position after 7.g4

If White wants to avoid the Meran Variation without entering the complexities of the Anti-Meran, 5.cxd5 or 5.Qb3 are possibilities, though after 5...exd5, the former leads to a line of the QGD Exchange where White's Nf3 enables the Black QB to freely develop, which should give equality (ECO code D43 and D45). After 5.e3 Nbd7, the main alternative to 6.Bd3 has become 6.Qc2, waiting for Black to commit to ...dxc4 before playing Bd3. Once a sideline, this move exploded in popularity in the 1990s, in large part due to Anatoly Karpov's advocacy.

Shirov–Shabalov Gambit in Anti-Meran

Another increasingly common gambit line used in the Anti-Meran system variation is the sharp 5.e3 Nbd7 6.Qc2 Bd6 7.g4. Popularized by Alexander Shabalov and Alexey Shirov, the gambit destabilizes the center for Black and has been successful for several grandmasters, including Kasparov. It has also been successful against computers, in games such as Kasparov vs. Deep Junior, Game 1.

5.Bg5

Solid white.svg a b c d e f g h Solid white.svg
8 a8 black rook b8 black knight c8 black bishop d8 black queen e8 black king f8 black bishop g8 black king h8 black rook 8
7 a7 black pawn b7 black pawn c7 black king d7 black king e7 black king f7 black pawn g7 black pawn h7 black pawn 7
6 a6 black king b6 black king c6 black pawn d6 black king e6 black pawn f6 black knight g6 black king h6 black king 6
5 a5 black king b5 black king c5 black king d5 black king e5 black king f5 black king g5 white bishop h5 black king 5
4 a4 black king b4 black king c4 black pawn d4 white pawn e4 black king f4 black king g4 black king h4 black king 4
3 a3 black king b3 black king c3 white knight d3 black king e3 black king f3 white knight g3 black king h3 black king 3
2 a2 white pawn b2 white pawn c2 black king d2 black king e2 white pawn f2 white pawn g2 white pawn h2 white pawn 2
1 a1 white rook b1 black king c1 black king d1 white queen e1 white king f1 white bishop g1 black king h1 white rook 1
Solid white.svg a b c d e f g h Solid white.svg
Position after 5.Bg5 dxc4

The Anti-Meran Gambit (ECO code D44) arises after 5.Bg5. Possible replies include ...h6, ...Nbd7, ...dxc4, and ...Be7. White refuses to shut in the dark-squared bishop, instead developing it to an active square where it pins the black knight. It is now possible for Black to transpose to either the Cambridge Springs Defense with 5...Nbd7 6.e3 Qa5, or enter the Orthodox Defense with 6...Be7.

Botvinnik Variation

This line is extremely complicated, with theory stretching past move thirty in some variations. Black captures a pawn by 5...dxc4. White takes control of the center with 6.e4 as Black defends with 6...b5. The main line of the Botvinnik now continues 7.e5 h6 8.Bh4 g5 9.Nxg5 hxg5 10.Bxg5 Nbd7. White will regain his piece with interest, emerging with an extra pawn, but Black will soon complete his development, gaining great dynamic compensation, whereas White's task is rather more difficult. White will fianchetto his king's bishop and castle kingside, while Black will play ...c5, ...Qb6, castle queenside, and can carry out an attack in the center or on either flank, leading to complex play. The opening was introduced by Mikhail Botvinnik in the 1945 USSR vs USA radio match vs Arnold Denker. Today, Alex Yermolinsky has an excellent record with the White pieces and Alexei Shirov has been Black's chief proponent in this variation.

Moscow Variation

The Moscow Variation 5.Bg5 h6 6.Bxf6 Qxf6 gives rise to play of a different character from the lines after 5...dxc4. Black has the bishop pair, which gives him good long-term chances, but must avoid prematurely opening the position in the face of White's superior development and central control, as his position is initially solid but passive. Alexei Dreev has played this line successfully as Black. The gambit line 6.Bh4 (the Anti-Moscow Variation) was once considered dubious, but has seen a recent resurgence. In return for the pawn, White receives a lead in development and a strong initiative. This dynamic mode of play, which is characteristic of the modern game, has seen this line being played by many strong grandmasters, though the theoretical verdict is unclear.

Alternatives after 5.e3 Nbd7 6.Bd3

Though appearing in contemporary master play with less frequency than the Meran, there are other possibilities: 6...Be7, 6...Bb4, introduced by the Italian master Max Romih, and 6...Bd6, which was much the most popular line before the debut of the Meran, and espoused by the American grandmaster Arthur Bisguier throughout his career.

After 6...Bd6, 7.0-0 0-0 8.e4 dxe4 9.Nxe4 Nxe4 10.Bxe4 is the most common line. There are now several alternatives for Black, with one a clear error, as it loses a pawn: 10...e5 11.dxe5 Nxe5 12.Nxe5 Bxe5 13.Bxh7+ Kxh7 14.Qh5+ Kg8 15.Qxe5. This line, however, has a strong drawish tendency in practice, due to the opposite-colored bishops, though all the heavy pieces remain on the board.

Black's other choices include 10...c5, though theory regards this as premature as it enables White to play for a kingside attack with 11.Bc2, followed by Qd3 and Bg5. 10...Nf6 has also been played, but this misplaces the knight and does nothing to further Black's play against the centre by means of the pawn breaks ...c5 or ...e5. Bisguier preferred 10...h6 and it has come to be considered the strongest plan.

The other ideas, 6...Be7, which has the same drawback as after 5.e3 Be7, and 6...Bb4, have become sidelines in modern play.

Notes

References and further reading

  • Encyclopedia of Chess Openings, volume D, chapters 43–49
  • Kuijf, Marinus (1995). Slav: Botvinnik Variation. New In Chess. ISBN 90-71689-80-8. 
  • Glenn Flear (2005). Starting Out: Slav & Semi-Slav. Everyman chess. ISBN 1857443934. 
  • Vera, Reinaldo (2007). Chess Explained: The Meran Semi-Slav. Gambit. ISBN 9781904600817. 
  • David Vigorito, Play the Semi-Slav, Quality Chess, 2008 ISBN 9789185779017

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Slav Defense — Chess diagram|= tright| = rd|nd|bd|qd|kd|bd|nd|rd|= pd|pd| | |pd|pd|pd|pd|= | |pd| | | | | |= | | |pd| | | | |= | |pl|pl| | | | |= | | | | | | | |= pl|pl| | |pl|pl|pl|pl|= rl|nl|bl|ql|kl|bl|nl|rl|=|The Slav Defense is a chess opening that begins… …   Wikipedia

  • Defense slave — Défense slave Cet article utilise la notation algébrique pour décrire des coups du jeu d échecs. Au jeu d échecs, la défense slave est une variante du gambit de la dame qui s obtient après les coups 1. d4 d5 2. c4 c6  …   Wikipédia en Français

  • Défense Slave — Cet article utilise la notation algébrique pour décrire des coups du jeu d échecs. Au jeu d échecs, la défense slave est une variante du gambit de la dame qui s obtient après les coups 1. d4 d5 2. c4 c6  …   Wikipédia en Français

  • Défense semi-slave — Cet article utilise la notation algébrique pour décrire des coups du jeu d échecs …   Wikipédia en Français

  • Défense slave — Cet article utilise la notation algébrique pour décrire des coups du jeu d échecs. La défense slave …   Wikipédia en Français

  • World Chess Championship 2006 — The World Chess Championship 2006 was a chess match between Classical World Chess Champion Vladimir Kramnik, and FIDE World Chess Champion Veselin Topalov. The match, which was won by Kramnik, determined, for the first time in 13 years, the… …   Wikipedia

  • List of chess openings named after places — *Aachen Gambit of the Nimzowitsch Defense 1.e4 Nc6 2.d4 d5 3.exd5 Nb4 *Abbazia Defense of the King s Gambit 1.e4 e5 2.f4 exf4 3.Nf3 d5 *American Gambit of the Dutch Defense 1.d4 f5 2.e4 fxe4 3.Nd2 *Amsterdam Variation of the Sicilian Defence,… …   Wikipedia

  • Chess opening — For a list of openings as classified by the Encyclopaedia of Chess Openings, see List of chess openings. Starting position a …   Wikipedia

  • World Chess Championship 2008 — Viswanathan Anand (IND) Champion …   Wikipedia

  • Mikhail Botvinnik — Full name Mikhail Moiseyevich Botvinnik Country Soviet Union Born August 17, 1911( …   Wikipedia