The Caro–Kann Defence is a chess opening characterised by the moves: 1. e4 c6
The Caro–Kann is a common defence against the King's Pawn Opening. It is classified as a Semi-Open Game, like the Sicilian Defence and French Defence, although it is thought to be more solid and less dynamic than either of those openings. It often leads to good endgames for Black, who has the better pawn structure. It allows Black to circumvent enormous bodies of theory in 1.e4 openings such as the Ruy Lopez and the Sicilian Defence.
Unlike its sister opening, the French Defence, the Caro–Kann does not hinder the development of Black's light-squared bishop. However, it comes at the cost of a tempo because Black has to play 1...c6 before pushing the pawn to c5, whereas Black can push c7–c5 in one move in the French Defence. White can combat the Caro–Kann in several different ways, often gaining a space advantage; additionally, Black has less mobility and can lag in development.
In the 21st century, grandmasters Vladislav Artemiev and Alireza Firouzja use the opening with regularity, while Ding Liren and Hikaru Nakamura use it on occasion.
History
The opening is named after the English player Horatio Caro and the Austrian player Marcus Kann, both of whom analysed it in 1886. Kann scored an impressive 24-move victory with the Caro–Kann Defence against German-British chess champion Jacques Mieses at the 4th German Chess Congress in Hamburg in May 1885:
Main line: 2.d4 d5
After 2.d4 d5 the most common moves are 3.Nc3 (Classical and Modern variations), 3.Nd2, 3.exd5 (Exchange Variation), and 3.e5 (Advance Variation).
3.Nc3 and 3.Nd2
3.Nc3 and 3.Nd2 usually transpose into each other after 3...dxe4 4.Nxe4. Since the 1970s, 3.Nd2 has increased in popularity to avoid the Gurgenidze Variation (3.Nc3 g6) and to retain the option of 4.c3.
Classical Variation: 3...dxe4 4.Nxe4 Bf5
The most common way of handling the Caro–Kann, the Classical Variation (often referred to as the Capablanca Variation after Cuban grandmaster José Raúl Capablanca), is defined by the moves: 1.e4 c6 2.d4 d5 3.Nc3 (or 3.Nd2) dxe4 4.Nxe4 Bf5. This was long considered to represent best play for both sides in the Caro–Kann. White usually continues: 5.Ng3 Bg6 6.h4 h6 7.Nf3 Nd7 8.h5 Bh7 9.Bd3 Bxd3 10.Qxd3. Although White's pawn on h5 looks ready to attack, it can prove to be a weakness in an endgame.
Much of the Caro–Kann's reputation as a defence stems from this variation. Black makes very few compromises in pawn structure and plays a timely ...c6–c5 to contest the d4-square. Variations with Black castling gave the Caro–Kann its reputation of being solid but somewhat boring. More popular recently are variations with Black castling and even leaving his king in the . These variations can be and dynamic.
Here is a illustrating White's attacking chances when the players castle on opposite sides in the Classical Variation:
Modern Variation: 3...dxe4 4.Nxe4 Nd7
Another solid line, this variation is characterised by the moves: 1.e4 c6 2.d4 d5 3.Nc3 (or 3.Nd2) dxe4 4.Nxe4 Nd7. At one time named after the first world champion Wilhelm Steinitz, nowadays the variation is variously referred to as the Smyslov Variation after the seventh world champion Vasily Smyslov who played a number of notable games with it; the Karpov Variation, after the twelfth world champion Anatoly Karpov, in whose repertoire it appeared quite often; or, most commonly, the Modern Variation. The short-term goal of 4...Nd7 is to ease by the early exchange of a pair of knights without compromising the structural integrity of Black's position. Play is similar to the Classical Variation except that Black has more freedom by delaying the development of his bishop, and is not forced to play it to the g6-square. This freedom comes at a cost, however, as White enjoys added freedom in taking up space in the centre, and often plays the aggressive 5.Ng5 where Black's development is brought into question as well as the positional weakness of the f7-square. The famous last game of the Deep Blue versus Garry Kasparov rematch where Kasparov committed a known blunder and lost was played in this very line.
Specialist knowledge is a must to play this opening. Otherwise Black could fall prey to early attacks such as the quick mating for White, 5.Qe2 followed by 6.Nd6#.