Board Position
A popular and sound but unambitious semi-open King's Pawn defence. It avoids the drawback of the French - the shutting in of the QB - but has other drawbacks and tends to favour White. First studied in 1886 by Horatio Caro and Marcus Kann. Board Position
Black replies ..P-QB3 (move 1b, left) to support a ..P-Q4 advance where, after giving up the centre by removing White's king's pawn, Black has some compensating advantages.
Apart from the main (Classical) opening line below, the guide also includes the Two Knights Variation and the Exchange Variation (leading to the Panov and Panov-Botvinnik Attacks).

Clear or Groups 
or see move: 1 e4 c6 2 d4 d5 3 Nc3 dxe4 4 Nxe4 Bf5 5 Ng3 Bg6 6 Nf3 Nd7 7 Bd3 e6
8 0-0 Ngf6 9 Re1 Be7 10 c4 Qc7 11 b3 Bxd3 12 Qxd3 0-0