This game reminded me of some interesting games I studied a few years ago.
If you substitute a6 for Be6, I think you will have some games that were very important to theory at the time they were played.
Alekhine-Botvinnik Nottingham 1936
(see chessgames.com for the game with annotations by Alekhine)
[Event "Nottingham (05)"]
[Site "Nottingham (05)"]
[Date "1936.08.14"]
[Round "5"]
[Result "1/2-1/2"]
[White "Alexander Alekhine"]
[Black "Mikhail Botvinnik"]
[ECO "B72"]
1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6
6.Be2 Bg7 7.Be3 Nc6 8.Nb3 Be6 9.f4 O-O 10.g4 d5 11.f5
Bc8 12.exd5 Nb4 13.d6 Qxd6 14.Bc5 Qf4 15.Rf1 Qxh2 16.Bxb4 Nxg4 17.Bxg4 Qg3+ 18.Rf2 Qg1+ 19.Rf1 Qg3+
20.Rf2 Qg1+ 1/2-1/2
In the game, white tried to make a monstrous kingside attack, but black was game and counterattacked quite well. The line made it look like black could force a draw in this variation. Check it out, it's a real slugfest.
Fast Forward to 1961
Fischer-Reshevsky 2nd Match Game
(Game 26 in My 60 Memorable Games)
[Event "Match"]
[Site "New York"]
[Date "1961.??.??"]
[Round "2"]
[Result "1-0"]
[White "Robert James Fischer"]
[Black "Samuel Reshevsky"]
[ECO "B32"]
1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 g6 5. Nc3 Bg7 6. Be3
Nf6 7. Be2 O-O 8. f4 d6 9. Nb3 Be6 10. g4 d5 11. f5 Bc8
12. exd5 Nb4 13. Bf3 gxf5 14. a3 fxg4 15. Bg2 Na6 16. Qd3 e6
17. O-O-O Nxd5 18. h3 g3 19. Rhg1 Qd6 20. Bxd5 exd5 21. Nxd5
Kh8 22. Bf4 Qg6 23. Qd2 Bxh3 24. Rxg3 Bg4 25. Rh1 Rfe8 26. Ne3
Qe4 27. Qh2 Be6 28. Rxg7 Kxg7 29. Qh6+ Kg8 30. Rg1+ Qg6
31. Rxg6+ fxg6 32. Nd4 Rad8 33. Be5 Rd7 34. Nxe6 Rxe6 35. Ng4
Rf7 36. Qg5 Rf1+ 37. Kd2 h5 38. Qd8+ 1-0
Fischer improves the line and gets a nice win out of it.
I'm not sure how the line is evaluated today, but I always find studying the history of variations very interesting.
Fischer was extremely well versed on all the classics.
Another example of his improvements, is the game
Maroczy-Capablanca 1926
1.e4 c6 2.d4 d5 3.exd5 cxd5 4.Bd3 Nc6 5.c3 Nf6 6.Bf4 Bg4 7.Qb3 Na5 8.Qa4+ Bd7 9.Qc2 Qb6 10.Nf3 e6 11.0-0 Bb5
Black traded off his bad bishop and later ground out a win.
Fast Forward to 1970
Fischer-Petrosian (chessgames.com even has a photo!)
Fischer has just played 11.a4 (instead of 0-0). The light squared bishop remained bad for a long time, and white eventually won a nice game. The Na5 line fell off the map.
I know this is a little off subject, but I always find history of openings and why the moves played became the moves played very interesting.