1. e2e4  1... c7c6  2. d2d4  2... d7d5  3. b1c3  3... d5e4  4. c3e4 This was once the undisputed main line of the Caro-Kann Defense. Nowadays the advance variation (4.e5) is also very popular. 4... g8f6 The fashionable move, supplanting 4...Bf5 and 4...Nd7. 5. e4f6  5... e7f6 [%c_effect f6;square;f6;type;GreatFind;persistent;true] There was a time when capturing with the g-pawn was considered the best move, but today's computers have a clear preference for taking with the e-pawn. Despite having doubled pawns and granting White a dangerous pawn majority on the queenside, it seems that Black's free piece development is a good compensation. 6. c2c3  6... f8d6  7. f1d3  7... e8g8  8. d1c2  8... f8e8  9. g1e2 The critical position of this opening system. 9... h7h5 [%c_effect h5;square;h5;type;GreatFind;persistent;true] A somewhat surprising move, as it seems dangerous to advance the pawn two squares when White can still castle on the queenside. But practice has shown that White's attack doesn't arrive so quickly. 10. c1e3 White decides to go for queenside castling. There are over a thousand games in this position.