Victory against a GM.

This wasn't the best game I ever played. It's the only game of chess I remember playing against a grandmaster. I gave myself no chance but I was on a no resign policy for the tournament. My opponent did berserk but I couldn't believe my eyes when he played helpmate in 2. [Site "lichess.org/ZHTYqnsv"]
[Date "2017.12.28"]
[Round "-"]
[White "finlip"]
[Black "penguingim1"]
[Result "1-0"]
[UTCDate "2017.12.28"]
[UTCTime "15:19:48"]
[WhiteElo "1735"]
[BlackElo "2517"]
[WhiteRatingDiff "+25"]
[BlackRatingDiff "-34"]
[BlackTitle "GM"]
[Variant "Standard"]
[TimeControl "300+3"]
[ECO "D31"]
[Opening "Queen's Gambit Declined: Charousek (Petrosian) Variation"]
[Termination "Normal"]
[Event "2017 Winter Marathon"]
[Annotator "lichess.org"]

1. d4 { [%clk 0:05:00] } d5 { [%clk 0:02:30] } 2. c4 { [%clk 0:05:02] } e6 { [%clk 0:02:29] } 3. Nc3 { [%clk 0:05:04] } Be7 { [%clk 0:02:28] } { D31 Queen's Gambit Declined: Charousek (Petrosian) Variation } 4. Nf3 { [%clk 0:04:58] } Nf6 { [%clk 0:02:27] } 5. Bg5 { [%clk 0:04:59] } h6 { [%clk 0:02:26] } 6. Bh4 { [%clk 0:05:00] } O-O { [%clk 0:02:26] } 7. cxd5 { [%clk 0:04:57] } Nxd5 { [%clk 0:02:24] } 8. Bxe7 { [%clk 0:04:57] } Qxe7 { [%clk 0:02:24] } 9. e4 { [%clk 0:04:56] } Nxc3 { [%clk 0:02:23] } 10. bxc3 { [%clk 0:04:59] } b6 { [%clk 0:02:23] } 11. Bd3 { [%clk 0:05:00] } Bb7 { [%clk 0:02:22] } 12. O-O { [%clk 0:05:02] } c5 { [%clk 0:02:21] } 13. Re1?! { (0.28 → -0.23) Inaccuracy. Best move was d5. } { [%clk 0:05:00] } (13. d5 Nd7) 13... Rd8?! { (-0.23 → 0.60) Inaccuracy. Best move was cxd4. } { [%clk 0:02:19] } (13... cxd4) 14. Qc2? { (0.60 → -0.72) Mistake. Best move was d5. } { [%clk 0:04:56] } (14. d5 Nd7 15. Qb3 Qd6 16. Rad1 Ne5 17. Nxe5 Qxe5 18. c4 Re8 19. g3 Rad8 20. Qa4 Qb8) 14... cxd4 { [%clk 0:02:18] } 15. cxd4 { [%clk 0:04:58] } Nc6 { [%clk 0:02:17] } 16. Rad1 { [%clk 0:04:58] } Nxd4 { [%clk 0:02:15] } 17. Nxd4 { [%clk 0:05:00] } Rxd4 { [%clk 0:02:15] } 18. e5 { [%clk 0:04:59] } Rad8 { [%clk 0:02:14] } 19. Be2?! { (-1.67 → -2.50) Inaccuracy. Best move was Bf1. } { [%clk 0:04:12] } (19. Bf1 Rxd1) 19... Qg5 { [%clk 0:02:07] } 20. f3?! { (-2.12 → -2.82) Inaccuracy. Best move was Bf1. } { [%clk 0:04:06] } (20. Bf1 Be4 21. Qe2 Rxd1 22. Rxd1 Rxd1 23. Qxd1 Qxe5 24. Qa4 a5 25. Qe8+ Kh7 26. Qxf7 Qa1) 20... Qxe5 { [%clk 0:01:54] } 21. Rxd4 { [%clk 0:03:59] } Qxd4+ { [%clk 0:01:50] } 22. Kf1 { [%clk 0:03:55] } Qh4?! { (-2.88 → -1.95) Inaccuracy. Best move was Qf4. } { [%clk 0:01:35] } (22... Qf4 23. h3) 23. Rd1? { (-1.95 → -3.68) Mistake. Best move was Qc7. } { [%clk 0:03:45] } (23. Qc7 Bd5 24. a3 Ra8 25. Rc1 Qf6 26. Qc3 e5 27. Kg1 Be6 28. Qe3 Rc8 29. Rxc8+ Bxc8) 23... Rc8 { [%clk 0:01:29] } 24. Qd2 { [%clk 0:03:16] } Qxh2 { [%clk 0:01:25] } 25. Bd3? { (-3.34 → -4.76) Mistake. Best move was Qd6. } { [%clk 0:03:17] } (25. Qd6) 25... Qh1+?! { (-4.76 → -3.90) Inaccuracy. Best move was Rc5. } { [%clk 0:01:21] } (25... Rc5 26. Qe3 Rg5 27. Qg1 Qxg1+ 28. Kxg1 Bxf3 29. Rd2 Kf8 30. Bc2 Ke7 31. Bd1 Bc6 32. Kf1) 26. Kf2 { [%clk 0:03:17] } Qh4+ { [%clk 0:01:21] } 27. Kf1 { [%clk 0:03:19] } Qf6 { [%clk 0:01:19] } 28. Bb1 { [%clk 0:03:20] } Qe5?? { (-3.70 → Mate in 2) Checkmate is now unavoidable. Best move was Bd5. } { [%clk 0:01:11] } (28... Bd5 29. Kg1 Qe7 30. Qe3 Kf8 31. Rd4 b5 32. a3 Qc7 33. Be4 Bxe4 34. fxe4 Qc3 35. Rd3) 29. Qd8+ { [%clk 0:03:17] } Rxd8 { [%clk 0:01:04] } 30. Rxd8# { [%clk 0:03:15] } { White wins by checkmate. } 1-0

It happens to the best of us. That reminds me of a game played between Karpov and Evgeny Bareev. Bareev is a grandmaster, and was at one time the 4th highest-rated player in the world. Check out his move 35...Ba7??: http://www.chessgames.com/perl/chessgame?gid=1069122

#2 When you mentioned Ba7 I immediately knew you were referring to Karpov's legendary Linares 1994 lol

Can't get +9 without luck :)

Dude, to defeat a GM is such a conquest, but you defeated a super GM, I would say GM Penguim is the strongest lichess player in activity, or in the top 3 at least.
Congratulations for the achievement, you've done something very hard even among GMs.

That's why after the game, on chat, I said I beat the GM and not I beat a GM. @josevitor91

The move given in the Karpov game is even more terrible. Black isn't totally winning as my opponent was in our game and the move played at least loses the rook if not allows checkmate. In our game, my opponent was pressing and mate is probably harder to see.

Penguin is not a super GM. To be a super GM you have to have 2700+ Fide rating.

Penguin is a Super IM

he is gm.
not so strong, tho'