Rare Mating Net

I played this blitz game today. It went into a bishops of opposite color endgame. White manages to win a pawn, but in doing so he traps himself in a crazy mating net. Black plays 50...f6! and wins instantly. Note that White’s bishop can’t intervene due to Black’s bishop being a light square bishop while White’s bishop is a dark square bishop.

[Event "Casual Blitz game"]
[Site "lichess.org/x0JhSCK4"]
[Date "2021.05.31"]
[White "ELMULLA"]
[Black "mruknowwho"]
[Result "0-1"]
[UTCDate "2021.05.31"]
[UTCTime "00:31:26"]
[WhiteElo "1807"]
[BlackElo "1851"]
[Variant "Standard"]
[TimeControl "300+3"]
[ECO "C55"]
[Opening "Italian Game: Two Knights Defense"]
[Termination "Time forfeit"]
[Annotator "lichess.org"]

1. e4 { [%eval 0.24] [%clk 0:05:00] } 1... e5 { [%eval 0.21] [%clk 0:05:00] } 2. Nf3 { [%eval 0.3] [%clk 0:05:02] } 2... Nc6 { [%eval 0.18] [%clk 0:05:02] } 3. Bc4 { [%eval 0.13] [%clk 0:05:04] } 3... Nf6 { [%eval 0.48] [%clk 0:05:04] } { C55 Italian Game: Two Knights Defense } 4. O-O?! { (0.48 → -0.36) Inaccuracy. Ng5 was best. } { [%eval -0.36] [%clk 0:05:06] } (4. Ng5 d5 5. exd5 Na5 6. Bb5+ c6 7. dxc6 bxc6 8. Bd3 Ng4) 4... Nxe4 { [%eval -0.43] [%clk 0:05:05] } 5. Bd5 { [%eval -0.37] [%clk 0:04:41] } 5... Nf6 { [%eval 0.01] [%clk 0:05:04] } 6. Bxc6 { [%eval -0.55] [%clk 0:04:41] } 6... dxc6 { [%eval -0.32] [%clk 0:05:05] } 7. Nxe5 { [%eval -0.5] [%clk 0:04:43] } 7... Bd6 { [%eval -0.28] [%clk 0:04:55] } 8. d4 { [%eval -0.46] [%clk 0:04:38] } 8... O-O { [%eval -0.39] [%clk 0:04:54] } 9. f4?! { (-0.39 → -1.35) Inaccuracy. Bf4 was best. } { [%eval -1.35] [%clk 0:04:35] } (9. Bf4) 9... c5 { [%eval -1.39] [%clk 0:04:45] } 10. c3 { [%eval -1.85] [%clk 0:04:37] } 10... cxd4 { [%eval -1.41] [%clk 0:04:41] } 11. cxd4 { [%eval -1.13] [%clk 0:04:36] } 11... c5 { [%eval -1.13] [%clk 0:04:41] } 12. d5? { (-1.13 → -2.44) Mistake. Nc3 was best. } { [%eval -2.44] [%clk 0:04:16] } (12. Nc3 cxd4) 12... b6?! { (-2.44 → -1.79) Inaccuracy. b5 was best. } { [%eval -1.79] [%clk 0:04:31] } (12... b5 13. a4 b4 14. Nd2 Bb7 15. Nc6 Qd7 16. Nc4 Rae8 17. N6e5 Bxe5 18. fxe5 Nxd5 19. Bg5) 13. Nc3 { [%eval -1.87] [%clk 0:04:14] } 13... Bb7 { [%eval -1.8] [%clk 0:04:31] } 14. Be3 { [%eval -2.34] [%clk 0:04:02] } 14... Be7?! { (-2.34 → -1.43) Inaccuracy. Bc7 was best. } { [%eval -1.43] [%clk 0:04:26] } (14... Bc7 15. Qf3) 15. Qd2?! { (-1.43 → -2.29) Inaccuracy. Nc6 was best. } { [%eval -2.29] [%clk 0:03:36] } (15. Nc6 Qe8 16. Nxe7+ Qxe7 17. Bf2 Qd7 18. f5 Nxd5 19. Nxd5 Qxd5 20. Qxd5 Bxd5 21. f6 Rfe8) 15... Nxd5 { [%eval -2.19] [%clk 0:04:25] } 16. Nxd5?! { (-2.19 → -3.36) Inaccuracy. Rad1 was best. } { [%eval -3.36] [%clk 0:03:34] } (16. Rad1 Nf6 17. Qc2 Qc7 18. Nb5 Qb8 19. Qd3 Qc8 20. Qc4 Ng4 21. Qe2 Nxe3 22. Qxe3 Rd8) 16... Qxd5 { [%eval -3.55] [%clk 0:04:16] } 17. Qxd5 { [%eval -3.33] [%clk 0:03:32] } 17... Bxd5 { [%eval -3.39] [%clk 0:04:17] } 18. Rad1 { [%eval -3.97] [%clk 0:03:31] } 18... Rad8 { [%eval -3.24] [%clk 0:04:12] } 19. b3 { [%eval -3.49] [%clk 0:03:28] } 19... Ba8 { [%eval -3.17] [%clk 0:04:05] } 20. Kf2 { [%eval -3.15] [%clk 0:03:26] } 20... Bf6?? { (-3.15 → -0.56) Blunder. Rxd1 was best. } { [%eval -0.56] [%clk 0:03:59] } (20... Rxd1 21. Rxd1) 21. Nd7 { [%eval -0.56] [%clk 0:03:20] } 21... Rfe8 { [%eval -0.75] [%clk 0:03:55] } 22. Nxf6+ { [%eval -0.73] [%clk 0:03:22] } 22... gxf6 { [%eval -0.61] [%clk 0:03:56] } 23. g3?! { (-0.61 → -1.31) Inaccuracy. f5 was best. } { [%eval -1.31] [%clk 0:03:12] } (23. f5 Be4) 23... f5 { [%eval -1.1] [%clk 0:03:32] } 24. h4?! { (-1.10 → -1.69) Inaccuracy. Rd2 was best. } { [%eval -1.69] [%clk 0:03:12] } (24. Rd2 Rxd2+) 24... h5?! { (-1.69 → -1.12) Inaccuracy. Be4 was best. } { [%eval -1.12] [%clk 0:03:24] } (24... Be4 25. Rfe1) 25. Rfe1 { [%eval -1.47] [%clk 0:03:06] } 25... Be4 { [%eval -1.74] [%clk 0:03:22] } 26. Ke2 { [%eval -1.72] [%clk 0:02:51] } 26... Bg2 { [%eval -1.49] [%clk 0:02:46] } 27. Rxd8 { [%eval -1.28] [%clk 0:02:43] } 27... Rxd8 { [%eval -1.37] [%clk 0:02:47] } 28. Kf2 { [%eval -1.47] [%clk 0:02:35] } 28... Bh3 { [%eval -1.03] [%clk 0:02:34] } 29. Re2 { [%eval -0.94] [%clk 0:01:58] } 29... Rd1 { [%eval -0.87] [%clk 0:02:31] } 30. Re1 { [%eval -0.89] [%clk 0:01:59] } 30... Rd3 { [%eval -0.92] [%clk 0:02:19] } 31. Ke2 { [%eval -1.17] [%clk 0:01:46] } 31... Rd5 { [%eval -0.99] [%clk 0:02:11] } 32. Bd2 { [%eval -1.15] [%clk 0:01:42] } 32... Bg4+ { [%eval -1.4] [%clk 0:01:58] } 33. Ke3 { [%eval -1.48] [%clk 0:01:43] } 33... Rd7 { [%eval -0.95] [%clk 0:01:49] } 34. Bc3 { [%eval -0.59] [%clk 0:01:38] } 34... b5 { [%eval -0.14] [%clk 0:01:35] } 35. Bf6 { [%eval -0.47] [%clk 0:01:01] } 35... c4 { [%eval -0.06] [%clk 0:01:28] } 36. bxc4 { [%eval 0.0] [%clk 0:01:02] } 36... bxc4 { [%eval 0.0] [%clk 0:01:28] } 37. Rc1 { [%eval -0.18] [%clk 0:01:02] } 37... Rc7 { [%eval 0.0] [%clk 0:01:25] } 38. Rc3 { [%eval 0.0] [%clk 0:01:03] } 38... a5 { [%eval 0.15] [%clk 0:01:14] } 39. Kd4 { [%eval 0.0] [%clk 0:00:37] } 39... Be2 { [%eval 0.03] [%clk 0:01:12] } 40. Re3 { [%eval 0.0] [%clk 0:00:33] } 40... c3 { [%eval 0.0] [%clk 0:00:54] } 41. Rxc3 { [%eval 0.0] [%clk 0:00:33] } 41... Rxc3 { [%eval 0.0] [%clk 0:00:51] } 42. Kxc3 { [%eval 0.0] [%clk 0:00:35] } 42... a4 { [%eval 0.0] [%clk 0:00:45] } 43. a3 { [%eval 0.0] [%clk 0:00:36] } 43... Bd1 { [%eval 0.0] [%clk 0:00:45] } 44. Kd4 { [%eval 0.0] [%clk 0:00:38] } 44... Kf8 { [%eval 0.0] [%clk 0:00:43] } 45. Ke5 { [%eval 0.0] [%clk 0:00:37] } 45... Bc2 { [%eval 0.0] [%clk 0:00:44] } 46. Bg5 { [%eval 0.0] [%clk 0:00:37] } 46... Bd3 { [%eval 0.0] [%clk 0:00:35] } 47. Kf6 { [%eval 0.0] [%clk 0:00:37] } 47... Bc2 { [%eval 0.0] [%clk 0:00:35] } 48. Bh6+ { [%eval 0.0] [%clk 0:00:37] } 48... Kg8 { [%eval 0.0] [%clk 0:00:30] } 49. Kg5 { [%eval 0.0] [%clk 0:00:36] } 49... Kh7 { [%eval 0.05] [%clk 0:00:20] } 50. Kxh5?? { (0.05 → Mate in 3) Checkmate is now unavoidable. Bf8 was best. } { [%eval #-3] [%clk 0:00:35] } (50. Bf8 Bd1 51. Kxf5 Kg8 52. Bc5 Kg7 53. Bd4+ Kf8 54. Kf6 Ke8 55. Bc3 Bf3 56. Bb4 Be2) 50... f6 { [%eval #-2] [%clk 0:00:14] } 51. Bg5 { [%eval #-2] [%clk 0:00:05] } 51... Bd1+ { [%eval #-1] [%clk 0:00:07] } { Black wins on time. } 0-1

I really am shocked, that white wished to suicide by trapping his king there anyways I wanted to say that this will help you in posting your next forums.

lichess.org/forum/lichess-feedback/how-to-post-games-videos-and-images-to-the-forum

Yes, there's a reason why it's so rare...

@mruknowwho
Yeah, that's rare and I have seen the mate few times at Lichess.
White dug it's grave from a dead rubber!
A nice win!