Not logged inRybka Chess Community Forum
Up Topic The Rybka Lounge / Test Positions / TCEC 19 SuFi - Happy Halloween! and Chigorin 3.Nc3
- By MrKris (***) Date 2020-10-17 21:48
https://en.wikipedia.org/wiki/Halloween_Gambit
From Wikipedia, the free encyclopedia
The Halloween Gambit (also known as the Müller–Schulze Gambit or Leipzig Gambit) is an aggressive chess opening gambit in which White sacrifices a knight early on for a single pawn. The opening is an offshoot of the normally staid Four Knights Game and is defined by the moves:

1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Nxe5

The theoretician Oskar Cordel reported in 1888 that Leipzig club players used the opening to dangerous effect, but he did not believe it was sound. Their name for it, Gambit Müller und Schulze, was not after any players by those names, but rather a jocular German equivalent of "Smith and Jones", or, "Tom, Dick, and Harry". The modern name "Halloween Gambit" was given by the German player Steffen Jakob, who explained that "Many players are shocked, the way they would be frightened by a Halloween mask, when they are mentally prepared for a boring Four Knight's, and then they are faced with Nxe5."


Book: 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Nxe5 Nxe5 5.d4 Nc6 ? {maybe 5...Ng6 risked 0-1, 0-1}
Lc0 1/2-1/2 Sf https://tcec-chess.com/#div=sf&game=71&season=19
Sf 1/2-1/2 Lc0 https://tcec-chess.com/#div=sf&game=72&season=19

Both SuFi games continued as in Wikipedia:
When Black retreats 5...Nc6, White chases the knight again with 6.d5. Then Black has 6...Ne5 (the Main line), or 6...Bb4 (Pinski's move).
After 6...Ne5, White chases again with 7.f4. Then after 7...Ng6 the game usually continues 8.e5 Ng8 9.d6 cxd6 10.exd6
(see TCEC games). In this case White's attack is very dangerous, and likely to prevail in practical play, with the threat of Nb5–c7 difficult to defend satisfactorily. Precise defense may theoretically preserve Black's material advantage but White has achieved his opening objectives.

Here, in just a quick experiment, Lc0 was able to win with 5...Ng6(!), and it only drew as black with 5...Nc6?:
                          {here + is good for the mover, - bad for the mover} [Event "G/20'+10'' PONDER 8GBh Sy6"]
[Site "R7 2700X 14t / RTX 2060"]
[Date "2020.10.17"]
[Round "2"]
[White "Cfish-201011-Pure"]
[Black "Lc0v0.26.3_J92-270"]
[Result "0-1"]
[ECO "C47"]
[Opening "Four Knights"]
[Variation "Halloween Gambit"]
[TimeControl "1200+10"]
[Termination "adjudication"]
[PlyCount "83"]
[WhiteType "human"]
[BlackType "human"]

1. e4 {book} e5 {book} 2. Nf3 {book} Nc6 {book} 3. Nc3 {book} Nf6 {book} 4.
Nxe5 {book} Nxe5 {book} 5. d4 {book} Ng6 {book instead of TCEC's 5...Nc6} 6. e5 {-2.16/37 0 51s} Ng8
{+1.07/16 0 16s} 7. Bc4 {-2.23/36 0 28s} c6 {+1.13/20 0 5.2s} 8. Qe2
{-2.37/35 0 19s} Bb4 {+1.39/17 0 20s} 9. Bxf7+ {-2.91/40 0 200s} Kxf7
{+1.76/18 0 39s} 10. Qc4+ {-2.94/38 0 4.8s} d5 {+1.81/18 0 17s} 11. exd6+
{-2.65/38 0 4.1s} Be6 {+1.80/17 0 14s} 12. Qxb4 {-2.72/39 0 18s} Qb6
{+1.78/16 0 14s} 13. Qa3 {-2.94/38 0 14s} Nf6 {+1.78/16 0 20s} 14. Be3
{-3.08/37 0 31s} Bd5 {+1.84/15 0 4.6s} 15. O-O {-3.18/40 0 196s} Rhe8
{+2.04/14 0 0.45s} 16. Bg5 {-2.95/35 0 26s} Re6 {+2.35/13 0 85s} 17. Rad1
{-2.97/41 0 0s} h6 {+2.58/13 0 157s} 18. Bxf6 {-2.80/30 0 19s} Rxf6
{+2.60/13 0 0.43s} 19. Qc5 {-2.68/37 0 26s} Rf5 {+2.67/14 0 0.50s} 20. f4
{-3.87/39 0 207s} Kg8 {+2.90/12 0 2.4s} 21. g3 {-3.87/34 0 21s} Qd8
{+3.31/11 0 69s} 22. Rde1 {-3.92/36 0 0.056s} Qd7 {+3.45/10 0 45s} 23. Rf2
{-4.04/40 0 163s} Bxa2 {+4.42/10 0 55s} 24. Qa3 {-3.99/33 0 22s} Bd5
{+4.79/10 0 34s} 25. Re5 {-4.86/35 0 79s} Nxe5 {+4.76/10 0 64s} 26. dxe5
{-3.53/29 0 9.8s} g5 {+5.22/10 0 31s} 27. Ne2 {-4.59/35 0 170s} Raf8
{+5.04/10 0 55s} 28. Qc3 {-5.01/34 0 52s} gxf4 {+6.33/8 0 47s} 29. gxf4
{-5.71/34 0 21s} a5 {+6.17/8 0 49s} 30. Kf1 {-4.73/30 0 24s} a4 {+5.60/8 0
51s} 31. Ke1 {-4.66/29 0 26s} b5 {+5.87/9 0 22s} 32. Qg3+ {-4.91/28 0 22s}
Kh7 {+5.72/9 0 19s} 33. Qd3 {-4.28/23 0 3.0s} Be6 {+6.06/9 0 60s} 34. Nd4
{-5.28/25 0 18s} c5 {+6.07/10 0 15s} 35. Nxf5 {-4.50/24 0 1.5s} c4
{+5.70/10 0 49s} 36. Qd4 {-5.02/23 0 4.6s} Bxf5 {+5.33/9 0 20s} 37. Re2
{-7.14/27 0 23s} Qf7 {+5.72/9 0 20s} 38. c3 {-5.72/23 0 2.3s} Rg8 {+5.18/9
0 42s} 39. Kd2 {-8.80/32 0 0s} Rg6 {+5.09/9 0 64s} 40. Ke3 {-10.16/34 0
0.002s} Rg1 {+5.29/8 0 30s} 41. e6 {-11.12/34 0 5.1s} Bxe6 {+7.71/8 0 15s}
42. Kf2 {-11.91/34 0 23s, Black wins by adjudication} 0-1

[Event "G/20'+10'' PONDER 8GBh Sy6"]
[Site "R7 2700X 14t / RTX 2060"]
[Date "2020.10.16"]
[Round "1"]
[White "Cfish-201011-Pure"]
[Black "Lc0v0.26.3_J92-270"]
[Result "1/2-1/2"]
[ECO "C47"]
[Opening "Four Knights"]
[Variation "Halloween Gambit"]
[TimeControl "1200+10"]
[Termination "adjudication"]
[PlyCount "140"]
[WhiteType "human"]
[BlackType "human"]

1. e4 {book} e5 {book} 2. Nf3 {book} Nc6 {book} 3. Nc3 {book} Nf6 {book} 4.
Nxe5 {book} Nxe5 {book} 5. d4 {book} Nc6 {book} 6. d5 {-0.95/37 0 41s} Ne5
{+0.36/17 0 16s} 7. f4 {-0.80/36 0 15s} Ng6 {+0.37/22 0 8.2s} 8. e5
{-1.02/38 0 27s} Bb4 {+0.33/23 0 38s} 9. exf6 {-0.62/38 0 21s} Qxf6
{+0.33/19 0 0.53s} 10. Bd3 {-0.56/37 0 23s} Bxc3+ {+0.50/19 0 50s} 11. bxc3
{-0.51/41 0 9.6s} Qxc3+ {+0.53/19 0 13s} 12. Qd2 {-0.43/40 0 39s} Qxa1
{+0.56/17 0 25s} 13. c3 {0.0045 16s} d6 {+0.59/17 0 19s} 14. O-O {0.0047
25s} Bd7 {+0.60/17 0 1.0s} 15. Ba3 {0.0044 37s} Qxf1+ {+0.63/14 0 40s} 16.
Kxf1 {0.0048 0s} O-O {+0.64/13 0 33s} 17. c4 {0.0043 22s} Rfe8 {+0.65/14 0
36s} 18. Bb4 {0.0045 27s} f6 {+0.63/13 0 85s} 19. Qc2 {0.0055 0s} Kf7
{+0.64/13 0 32s} 20. Bd2 {0.0041 50s} b6 {+0.65/12 0 1.2s} 21. Kf2
{-0.06/46 0 94s} Re7 {+0.73/10 0 73s} 22. Qd1 {-0.18/41 0 0s} Kg8 {+0.80/10
0 69s} 23. Kg3 {-0.34/43 0 120s} Nf8 {+0.76/12 0 75s} 24. h4 {-0.10/43 0
0s} h6 {+0.75/10 0 59s} 25. Kf2 {-0.12/47 0 0.002s} Rae8 {+0.75/8 0 32s}
26. g4 {-0.11/43 0 28s} a6 {+0.75/10 0 36s} 27. a4 {-0.10/43 0 34s} a5
{+0.70/11 0 26s} 28. Kg3 {-0.17/44 0 44s} Rb8 {+0.71/11 0 25s} 29. Kh2
{0.0048 102s} Be8 {+0.75/10 0 45s} 30. Bf5 {-0.13/47 0 19s} Rd8 {+0.74/12 0
38s} 31. Kg1 {-0.12/49 0 112s} Bd7 {+0.76/10 0 38s} 32. Bc2 {-0.59/44 0
36s} Rc8 {+0.77/10 0 45s} 33. Bd3 {0.0050 31s} Rf7 {+0.75/10 0 30s} 34. Kf2
{-0.10/52 0 193s} Re7 {+0.70/11 0 40s} 35. Kg2 {-0.10/50 0 117s} Rf7
{+0.72/11 0 37s} 36. Bc3 {-0.07/48 0 137s} Re7 {+0.71/10 0 34s} 37. Bd2
{-0.13/48 0 20s} Be8 {+0.76/11 0 21s} 38. g5 {0.0047 8.6s} fxg5 {+1.08/18 0
22s} 39. hxg5 {0.0053 0s} hxg5 {+0.84/20 0 26s} 40. fxg5 {0.0057 0.001s}
Ra8 {+0.59/21 0 35s} 41. Kg3 {0.0058 0.002s} Bf7 {+0.43/21 0 64s} 42. Qg4
{0.0063 12s} Bg6 {+0.38/23 0 0.28s} 43. Bxg6 {0.0068 44s} Nxg6 {+0.29/22 0
0.28s} 44. Qh5 {0.0068 19s} Nf8 {+0.28/20 0 0.24s} 45. g6 {0.0065 21s} Re5
{+0.24/20 0 76s} 46. Qg4 {0.0070 0.001s} Rb8 {+0.22/19 0 40s} 47. Kf2
{0.0075 10s} Rbe8 {+0.37/14 0 28s} 48. Kf3 {0.0068 0.001s} R5e7 {+0.41/16 0
21s} 49. Qh5 {0.0069 56s} Rc8 {+0.39/19 0 33s} 50. Bf4 {0.0056 2.8s} Rce8
{+0.61/14 0 32s} 51. Bd2 {0.0066 0.002s} Rc8 {+0.51/15 0 35s} 52. Qg5
{0.0062 4.4s} Re5 {+0.43/18 0 0.46s} 53. Qg4 {0.0059 5.3s} Rd8 {+0.32/19 0
44s} 54. Bc3 {0.0063 13s} Re7 {+0.64/15 0 10s} 55. Qh5 {0.0060 43s} Rc8
{+0.51/17 0 17s} 56. Bd2 {0.0055 2.4s 3-fold repetition} Rce8 {+0.44/17 0
30s 3-fold repetition} 57. Kg3 {0.0067 16s} Ra8 {+0.24/19 0 23s} 58. Kf3
{0.0060 2.2s} Re5 {+0.46/12 0 16s} 59. Qg4 {0.0062 4.8s} Rd8 {+0.33/16 0
13s} 60. Bc3 {0.0064 10s} Re7 {+0.67/13 0 7.2s} 61. Qh5 {0.0067 1.7s} Rc8
{+0.56/13 0 17s} 62. Bd2 {0.0059 0s 3-fold repetition} Ra8 {+0.46/14 0 20s}
63. Bc3 {0.0070 5.5s} Rd8 {+0.51/14 0 13s 3-fold repetition} 64. Bd2
{0.0065 0s} Rde8 {+0.44/13 0 6.5s 3-fold repetition} 65. Kg3 {0.0067 44s}
Ra8 {+0.24/19 0 13s} 66. Kf3 {0.0059 28s} Rb8 {+0.41/13 0 8.9s} 67. Kg3
{0.0058 0s} Re5 {+0.33/13 0 10s} 68. Qg4 {0.0046 4.2s} Rd8 {+0.15/12 0 20s}
69. Bg5 {0.0053 11s} Rb8 {+0.11/12 0 14s} 70. Bd2 {0.0069 0.001s} Ra8
{+0.14/14 0 4.4s, Draw by adjudication} 1/2-1/2

Games in the pgn, conditions as above:
1. Halloween 5...Nc6, Cfish 1/2-1/2 Lc0
2. Halloween 5...Nc6, Lc0 0-1 Cfish
3. Halloween 5...Ng6, Cfish 0-1 Lc0    Lc0's only win
4. Halloween 5...Ng6, Lc0 1/2-1/2 Cfish
And for my next post this thread:
5. Chigorin 5.Nf3*, Cfish 1-0 Lc0   *instead of TCEC's 5.e4
6. Chigorin 5.Nf3*, Lc0 1/2-1/2 Cfish
7. Chigorin 4...Ne5**, Cfish 1-0 Lc0   **instead of TCEC's 4...Nb8, with moves through 9.Qc2!?
8. Chigorin 4...Ne5**, Lc0 1/2-1/2 Cfish
Attachment: SuFi-Halloween-Chigorin.pgn - Games (20k)
- By MrKris (***) Date 2020-10-17 21:55
There was also a rare variation of the Chigorin Defence that saw two draws:
1.d4 d5 2.c4 Nc6 3.Nc3 {higher white percentage but less often played than 3.Nf3 - ChessTempo.com 2500+} dxc4 {most common but black has a better record with 3...Nf6} 4.d5 {less common but a better white performance than 4.Nf3}

Both engines played 4...Nb8, rarely played by humans {the highest black rating is 2451}.
Lc0 1/2-1/2 Sf https://tcec-chess.com/#div=sf&game=85&season=19
Sf 1/2-1/2 Lc0 https://tcec-chess.com/#div=sf&game=86&season=19
Then both continued 5.e4 e5:
rnbqkbnr/ppp2ppp/8/3Pp3/2p1P3/2N5/PP3PPP/R1BQKBNR w KQkq e6 0 6


Compare the TCEC postion after 5...e5 to a very old variation of the Queen's Gambit Accepted:
1.d4 d5 2.c4 dxc4 3.e4 e5 4.d5 ?! {the only CT 2500+ game is from 1899, Steinitz-2650 0-1 Blackburne-2570, however it has 385 game with 4.Nf3(!).}
rnbqkbnr/ppp2ppp/8/3Pp3/2p1P3/8/PP3PPP/RNBQKBNR b KQkq - 0 4


The TCEC diagam (with white to move and its N on c3) is a full two tempi ahead of the QGA diagram (with N still on b1 and black to move).




[I tried two other Chigorin variations but Cfish won both as white and drew both as black - just a relative engine strength indication. See my last post for the link.]
Up Topic The Rybka Lounge / Test Positions / TCEC 19 SuFi - Happy Halloween! and Chigorin 3.Nc3

Powered by mwForum 2.27.4 © 1999-2012 Markus Wichitill