Funny test game

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Jouni
Posts: 3743
Joined: Wed Mar 08, 2006 8:15 pm
Full name: Jouni Uski

Funny test game

Post by Jouni »

[pgn]
[Event "No book 60"]
[Site "?"]
[Date "2025.11.05"]
[Round "45"]
[White "stockfish17.1"]
[Black "SFdev"]
[Result "1-0"]
[ECO "C67"]
[PlyCount "139"]
[EventDate "2025.??.??"]
[TimeControl "60"]

1. e4 {0.38/27 2.5s} e5 {-0.19/24 7.4s} 2. Nf3 {0.30/25 2.7s} Nc6 {-0.19/19 0.
66s} 3. Bb5 {0.28/24 1.5s} Nf6 {-0.24/23 1.3s} 4. O-O {0.28/24 1.2s} Nxe4 {-0.
19/20 0.79s} 5. Re1 {0.32/26 1.5s} Nd6 {-0.22/23 1.1s} 6. Nxe5 {0.23/28 2.3s}
Be7 {-0.20/20 1.1s} 7. Bf1 {0.22/28 1.5s} Nxe5 {-0.18/20 1.3s} 8. Rxe5 {0.22/
22 1.2s} O-O {-0.16/22 1.3s} 9. d4 {0.26/24 0.95s} Bf6 {-0.16/21 0.93s} 10. Re1
{0.22/23 1.5s} Re8 {-0.17/21 1.2s} 11. c3 {0.25/28 4.0s} Rxe1 {-0.11/19 0.90s}
12. Qxe1 {0.16/23 0.80s} Qe7 {-0.17/20 1.7s} 13. Qxe7 {0.19/21 1.2s} Bxe7 {-0.
24/22 1.7s} 14. a4 {0.25/26 2.4s} a5 {-0.12/19 1.4s} 15. g3 {0.26/23 1.3s} Nf5
{-0.14/21 1.2s} 16. Bg2 {0.22/26 1.8s} h6 {-0.16/21 1.2s} 17. Na3 {0.32/25 2.8s
} Bxa3 {-0.21/22 2.3s} 18. Rxa3 {0.33/21 0.63s} d6 {-0.14/20 1.2s} 19. h3 {0.
26/25 2.7s} Rb8 {-0.27/22 3.6s} 20. g4 {0.29/21 1.1s} Ne7 {-0.23/22 1.9s} 21.
c4 {0.28/24 2.0s} b6 {-0.23/19 1.0s} 22. Bd2 {0.24/23 1.4s} Be6 {-0.19/18 1.0s}
23. Re3 {0.32/24 1.3s} Kf8 {-0.23/18 0.97s} 24. b3 {0.35/23 1.5s} Bd7 {-0.25/
21 1.1s} 25. f4 {0.27/23 2.3s} f5 {-0.24/21 2.3s} 26. Bf3 {0.27/26 5.6s} fxg4 {
-0.26/20 1.6s} 27. hxg4 {0.24/19 0.93s} Re8 {-0.08/24 2.7s} 28. Kf2 {0.20/25 4.
6s} Nc6 {-0.11/25 4.6s} 29. Rxe8+ {0.28/24 0.83s} Kxe8 {-0.09/20 0.98s} 30. Bc3
{0.27/22 0.72s} Nb4 {-0.04/23 2.9s} 31. Kg3 {0.10/24 2.8s} Kf8 {-0.04/20 0.99s}
32. Be4 {0.14/22 1.1s} Nc6 {-0.03/22 1.1s} 33. f5 {0.10/29 7.5s} Ne7 {0.00/23
0.91s} 34. c5 {0.07/21 1.1s} Ng8 {-0.07/22 1.8s} 35. Bf3 {0.10/28 2.0s} Nf6 {
-0.03/23 0.99s} 36. cxd6 {0.13/30 1.4s} cxd6 {-0.01/22 0.92s} 37. d5 {0.14/25
0.43s} Be8 {-0.04/22 1.1s} 38. Bd4 {0.11/29 0.92s} Nd7 {-0.08/24 0.81s} 39. Be2
{0.14/28 1.1s} Nc5 {-0.08/25 1.2s} 40. Bc4 {0.18/26 1.0s} Ne4+ {-0.10/23 0.91s}
41. Kf4 {0.13/21 0.76s} Nd2 {-0.13/25 1.1s} 42. Bb5 {1.25/28 3.9s} Nxb3 {-1.50/
26 6.7s} 43. Bxb6 {1.18/18 0.94s} Bf7 {-1.32/19 1.3s} 44. Bc7 {1.21/23 2.7s}
Ke7 {-1.02/20 1.1s} 45. Bc6 {1.29/17 0.25s} Bg8 {-0.83/16 0.98s} 46. Ke4 {1.23/
17 0.45s} Bf7 {-0.93/18 1.1s} 47. Ke3 {1.17/22 0.62s} h5 {-0.61/18 2.8s} 48. g5
{0.74/19 0.82s} h4 {-0.64/16 0.78s} 49. f6+ {0.75/21 0.47s} gxf6 {-0.55/18 0.
98s} 50. gxf6+ {0.99/17 0.34s} Kxf6 {-0.58/16 1.4s} 51. Bxd6 {0.86/19 0.78s}
Kf5 {-0.50/17 0.88s} 52. Bh2 {0.56/22 2.7s} Nc5 {-0.54/15 1.00s} 53. Kd4 {0.52/
16 0.13s} Nb3+ {-0.31/15 0.98s} 54. Kc3 {0.55/19 0.16s} Nc5 {-0.66/19 2.3s} 55.
Kc4 {0.49/15 0.29s} Ne4 {-0.67/19 1.3s} 56. Kb5 {0.50/12 0.34s} Nc3+ {-0.52/19
0.93s} 57. Kc5 {0.32/14 1.0s} Bxd5 {-0.45/16 1.1s} 58. Bxd5 {0.31/12 0.72s}
Nxa4+ {-0.32/16 0.49s} 59. Kd4 {0.21/12 0.54s} Nb2 {-0.28/14 0.62s} 60. Bb7 {
0.28/14 0.49s} Kg4 {-0.27/15 0.40s} 61. Kc3 {0.33/23 1.4s} Na4+ {-0.26/14 0.53s
} 62. Kd4 {0.61/15 0.15s} Nb2 {-0.23/15 0.68s} 63. Bd6 {0.67/15 0.21s} h3 {-0.
22/16 0.43s} 64. Bc8+ {0.48/16 0.80s} Kh4 {-0.83/20 1.7s} 65. Ke4 {0.77/17 0.
32s} a4 {-0.88/24 1.8s} 66. Kf3 {0.18/22 1.4s} a3 {-0.92/20 0.24s} 67. Bxa3 {
0.13/21 0.36s} h2 {-0.80/18 0.27s} 68. Be7+ {0.11/24 0.24s} Kh5 {-0.67/16 0.32s
} 69. Kg2 {0.35/20 0.41s} Kg6 {-0.52/15 0.32s} 70. Kxh2 {0.57/19 0.21s, White
wins by adjudication: SyzygyTB} 1-0

[/pgn]
[d]2B5/4B3/6k1/8/8/8/1n5K/8 b - - 0 70


Stockfish don't see, that this is lose in 59 :). Seems to be very difficult/impossible to human.
Jouni
User avatar
Ajedrecista
Posts: 2156
Joined: Wed Jul 13, 2011 9:04 pm
Location: Madrid, Spain.

Re: Funny test game.

Post by Ajedrecista »

Hello Jouni:

Excelent example of a (very hard) KBBKN win! The Syzygy endgame tablebases site retrieves the longest KBBKN cursed win (8/8/8/1B6/8/8/8/1KBk2n1 b - - 0 1) as 78 moves and examples with wins just in the limit of the fifty-move rule (for example B7/8/8/8/8/8/8/nKBk4 b - - 0 1). Losing positions can be composed (for example a checkmate in 2 moves in 8/8/r7/2B5/1n6/1B6/N7/K1k5 b - - 0 1 with Rxa2+, Bxa2; Nc2# in a KBBKN final position).

I bring some problems, studies, positions, games... with KBBKN great endgames. There are many more for sure:

------------

I found and old study from 1851 at YACPDB (#585764) featuring a KBBKN endgame and manoeuvres to trap the knight. The original problem and the solution in descriptive notation is at pages 63 to 65 (study No. II) of the book Chess studies; or, Endings of Games by Kling and Horwitz (link to the book).

------------

The page 157 of Swedish Tidskrift för Schack magazine No. 5 of June-July, 1974 features the study No. 1701 (link to the issue) that enters into a KBBKN drawn endgame with an outstanding knight underpromotion, as seen in the solution at page 255 of the No. 8 of October, 1974 (link to the issue). The author of the study was Henning Källström:

[pgn][Event ""]
[Site ""]
[Date "1974"]
[SetUp "1"]
[FEN "4b3/8/1b3R2/5P2/1K6/8/k3p3/8 w - - 0 1"]
[Result "1/2-1/2"]

1.Re6 Bh5 2.f6 Bf2 (2... Bd4 3.f7 Bg7 4.f8=Q Bxf8+ 5.Kc3 Bg4 6.Re8 Bh5 7.Re6) 3.Rxe2 Bxe2 4.f7 Be1+ 5.Ka4 (5.Kc5 Kb3) 5... Bf3
6.Kb5 Be2+ 7.Ka4 Bg4 8.f8=N (8.Kb5 Bd7+ 9.Kc5 Kb3 10.Kd6 Bg4 11.Ke7 Bb4+ 12.Kf6 Bf8 13.Kg6 Be6) 8... Bc3 9.Kb5 Bf5 10.Kc6 Bg7
11.Nd7 1/2-1/2[/pgn]
  • Please note that I had to correct a typo at black's move 11 of the variation, where the original print wrongly says Bd4+ instead of Bb4+.
  • White can not promote after 5.- ..., Bf3 due to 6.- ..., Bc6#.
------------

There is an incomplete funny human game of 1995 at page 772 of EG magazine No. 119 - (Vol. VII) of January, 1996 (link to the issue) with an astonishing bishop underpromotion to reach a KBBKN very hard (cursed?) won endgame:

[pgn][Event "Hanham Congress 'Premier'"]
[Site "Bristol"]
[Round "2"]
[Date "1995.11.04"]
[White "S.R. Boniface"]
[Black "D.C. Pugh"]
[Result "1/2-1/2"]

1.e4 e5 2.Nf3 d6 3.Bc4 Be7 4.c3 Nf6 5.Ng5 O-O
6.Qb3 Qe8 7.O-O Nc6 8.Na3 a6 9.Nxf7 Rxf7 10.Bxf7+ Qxf7
11.Qxf7+ Kxf7 12.d3 Nh5 13.f4 exf4 14.Bxf4 Nxf4 15.Rxf4+ Kg8
16.d4 Bg5 17.Rf3 Bg4 18.Rg3 h5 19.Rf1 Rf8 20.Rxf8+ Kxf8
21.h3 Bf4 22.hxg4 Bxg3 23.gxh5 Kf7 24.Nc2 Bf4 25.Ne1 Kf6
26.Kf2 Bh6 27.Kf3 Na5 28.Nd3 Nc4 29.Kg4 Ke6 30.Kh4 Nd2
31.e5 Ne4 32.exd6 cxd6 33.g4 Bg5+ 34.Kh3 Kd5
35.Kg2 Kc4 36 Ne1 Bc1 37.Nf3 Bxb2 38.g5 Bxc3 39.h6 gxh6 40.gxh6 Nf6
41.Ng5 Kxd4 42.h7 Nxh7 43.Nxh7 b5 44.Kf3 Kd3 45.Ng5 d5
46.Ne6 a5 47.Nc7 Kc4 48.Ke2 Be5 49.Ne6 Kc3 50.Nc5 Bd6
51.Nb7 Bc7 52.Nc5 Bb6 53.Nd3 b4 54.Nf4 Kb2 55.Nxd5 Bd8
56.Kd3 Kxa2 57.Kc4 Ka3 58.Ne3 b3 59.Nd1 Bf6 60.Kb5 a4
61.Ne3 Ka2 62.Kxa4 b2 63.Nd1 b1=B (63... b1=Q (63... b1=R) 64.Nc3+ Bxc3 1/2-1/2) {Draw on move 92.}[/pgn]
  • The position after 56.- ..., Kxa2 is a checkmate in 18 moves.
  • The position after 61.- Ne3 is a checkmate in 13 moves (61.- ..., b2), but black played 61.- ..., Ka2 with a (cursed?) win in 72 moves.
------------

Enjoy!

Regards from Spain.

Ajedrecista.