Which opening is this?

[Amarant]

I was playing black and surprised to see my 2000+ rated opponent play this... I finally won the game, but could somebody analyze and see if there were interesting attacking lines available?

1. d4 {0:03} Nf6 {0:07} 2. e3 {0:01} g6 {0:09} 3. Bd3 {0:08} Bg7 {1:07} 4. c3 {0:05} d5 {1:32} 5. Nd2 {0:09} e5 {1:30} 6. dxe5 {0:06} Ng4 {1:02} 7. Ngf3 {0:47} c5 {1:41} 8. O-O {0:20} Nc6 {0:35} 9. h3 {0:37} Ngxe5 {0:10} 10. Nxe5 {0:05} Nxe5 {0:03} 11. Bc2 {0:39} O-O {2:43} 12. Nf3 {1:12} Nc6 {0:36} 13. Bb3 {1:25} d4 {0:16 The exchange could lead into an isolated pawn for black but white has to be careful if black gets this isolated pawn} 14. exd4 {0:32} cxd4 {0:13} 15. cxd4 {0:55} Nxd4 {0:06} 16. Nxd4 {0:59} Qxd4 {0:12} 17. Qf3 {1:02} Qb4 {1:54} 18. Rd1 {0:36} Bf5 {0:08} 19. Bd2 {1:24} Qe4 {0:24} 20. Bd5 {1:27 ??? decisive mistake a simple Qxe is better , but blacks bishops control the long diagonals and entire board} Qxf3 {0:40}
21. Bxf3 {0:02} Bxb2 {0:08} 22. Bh6 {1:58} Rfb8 {1:34} 23. Bf4 {0:47} Bxa1 {1:34} 24. Bxb8 {0:24} Rxb8 {0:10} 25. Rxa1 {0:07} b6 {0:15} 26. Re1 {1:06} Kg7 {0:42} 27. Bd5 {0:22} Kf6 {0:11} 28. f4 {1:11} Rd8 {0:30} 29. Bc4 {0:50} Rd4 {0:23} 30. Bb3 {1:03} Rxf4 {0:16} 31. Rc1 {0:16} a5 {0:19} 32. Rc6+ {0:18} Be6 {0:02} 33. Rxb6 {0:10} a4 {0:04} 34. Bd1 {4:20} Ke5 {1:57} 35. a3 {0:57} Rd4 {2:13} 36. Rb5+ {1:29} Kf4 {0:29} 37. Bf3 {1:11} Bb3 {0:37} 38. Kf2 {0:23} Rd2+ {0:05} 39. Ke1 {0:51} Ra2 {0:07} 40. Rb4+ {0:58} Ke5 {1:01} 41. Re4+ {0:31} Kd6 {0:21} 42. Rd4+ {0:13} Kc5 {0:12} 43. Rh4 {0:48} h5 {0:07} 44. Re4 {0:15} Rxa3 {0:06} 45. Re5+ {0:05} Kd6 {0:16} 46. Re3 {0:09} Ra1+ {0:03} 47. Kd2 {0:09} Ra2+ {0:07} 48. Kc3 {0:05} Rc2+ {0:10} 49. Kb4 {0:04} Rc4+ {0:03} 50. Ka3 {0:07} Rc2 {0:16} 51. Rd3+ {0:13} Kc5 {0:03}.

[lehmann]

Looks like a Colle, although I'm not sure if the moves exactly match the ECO code.

Usually White positions all his pieces to support a freeing e4 push. Once
White gets e4 in, his Q+B battery can be deadly on the diagonal leading to h7.

I think the best defensive systems are considered to be ones where Black fianchettoes kingside, although there are other lines. If Black can get in ...c5 or ...e5 (without losing material, that is), he is usually okay, as these moves tend to resolve the center in Black's favor.

Model games include Colle-O'Hanlon (?) and Colle-Vidmar..

[dobbz]

The main problem with Black systems based on g6 and Bg7, as old writers used to say, is that that Bishop byte on granite, referring to white pawns chain: d4, c3 and b2.

Perhaps is too old and comparison between games so distant, but remember that Colle (Edgar) played a game as White against Gruenfeld (Ernst) where both played "their" opening.. and White won!!

perhaps it was not because of the opening, but because of better player....