context: 1. e2e4  1... c7c6  2. d2d4  2... d7d5  3. e4d5  3... c6d5  4. f1d3  4... b8c6  5. c2c3 This variation against the Caro-Kann Defense is more poisonous than it seems. Bobby Fischer achieved a famous and devastating victory against Tigran Petrosian using this line. 5... d8c7 This is played in order to prevent White from developing the bishop on f4. 6. g1e2  6... c8g4  7. e1g1  7... e7e6  8. d1e1 [%c_effect e1;square;e1;type;Interesting;persistent;true] A subtle move. In addition to taking the knight out of the pin, White has another idea that will soon be revealed. 8... g8f6  9. f2f3  9... g4h5  10. e1h4 This is one of the points of White's play, although it's less dangerous than it seems at first sight. 10... h8g8 [%c_effect g8;square;g8;type;Interesting;persistent;true] A fantastic idea, and not new to this game. Black loses the right to castle, but prepares Bg6 to take with the h-pawn. 11. c1f4  11... c7b6  12. b1d2  12... h5g6  13. d3g6  13... h7g6  14. a2a4  14... f8e7  15. h4f2 The first new move of the game. 15... g8h8 The rook goes back to the now-open file. It's worth remembering that only this rook has moved, so castling queenside is still possible, although not advisable. I must admit that I once forgot that the rook had already moved and castled anyway, to my opponent's surprise - probably many have a similar story to tell. 16. b2b4  16... f6h5  17. a4a5  17... b6d8  18. f4e3  18... e7d6 The bishop goes to a better diagonal and forces a slight weakening in White's position. 19. g2g3  19... c6e7  20. g3g4  20... h5f6  21. e3f4  21... a8c8  22. f2g3  22... d6f4  23. g3f4  23... d8c7  24. f4c7  24... c8c7 The king in the center is not an issue anymore. It transpires that white's pawn advance on the queenside merely created weaknesses - the pawn chain is overextended. 25. d2b3  25... e7c8 [%c_effect c8;square;c8;type;GreatFind;persistent;true] 26. b3c5  26... c8d6  27. g1g2  27... e8e7  28. f1e1  28... g6g5 [%c_effect g5;square;g5;type;GreatFind;persistent;true] 29. e1h1  29... f6d7  30. g2g3  30... b7b6  31. a5b6  31... a7b6  32. c5d7 A comprehensible decision: it's not easy to evaluate whether to keep the knights or exchange them. 32... e7d7  33. h2h4 