context: 1. e2e4  1... c7c6  2. d2d4  2... d7d5  3. e4e5  3... c8f5  4. h2h4 This is one of the most interesting and popular options in the Advance Variation of the Caro-Kann. Black really needs to know what to do here. 4... h7h5 This is considered the best move by theory, stopping the dangerous advance of the kingside pawns. 5. f1d3 White reverts to a simpler strategy, exchanging bishops and trying to demonstrate that the inclusion of h4-h5 helps his position, since Black's king remains in danger with such a pawn formation. 5... f5d3  6. d1d3  6... d8a5 This check looks like a beginner's move, but it has the strategic idea of putting the queen on a6. White, naturally, doesn't want to exchange queens. 7. b1d2  7... e7e6  8. g1f3  8... a5a6  9. c2c4 This is why White placed the knight on d2. 9... g8h6  10. e1g1  10... h6f5 