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Up Topic The Rybka Lounge / Test Positions / The 12 games of Latvian-Svedenborg
- By MrKris (****) Date 2020-12-06 01:48
The ordinary 1. e4 e5 2. Nf3 f5 3. Nxe5 Qf6 4. d4 d6 5. Nc4 fxe4 6. Nc3 Qg6 7. f3, or similar, is nearly a refutation.

But this variation has a very low draw rate among humans at ChessTempo.com.

And in 1971, https://www.amazon.com/Dreispringerspiel-Bis-Konigsgambit-Paul-Keres/dp/B006NNIV04
GM Keres thought 3.Bc4 to be good, before humans refined the Svedenborg here.
(I bought the 'bis' series back then because they where about 1/2 the price of English language alternatives.
They where imported from East (back then) Germany, evidently an arts/culture exemption to the cold war.)

I was hoping for a lower than the 92% draw rate here because of the different 'style' of engines.

                         Elo   +-         Score    Draws
1. Lc0v0.26.3_J96-44      44   82  4.5/8  56.3%    87.5%
2. Stockfish_20112916      0    0  4.0/8  50.0%   100.0%
3. Black_Diamond-12r1    -44   82  3.5/8  43.8%    87.5%

11 of 12 games draws (92%), 1 game won by black (white 45%, black 54%).

The win was 124 moves, the draws were 13(!?) to 54 moves.

Book, 2 vars.: 1.e4 e5 2.Nf3 f5 3.Bc4 fxe4 4.Nxe5 d5 5.Qh5+ g6 6.Nxg6 hxg6
rnbqkbnr/ppp5/6p1/3p3Q/2B1p3/8/PPPP1PPP/RNB1K2R w KQkq - 0 7

    7.Qxh8+:    Lc Sf BD     7.Qxg6+:    Lc Sf BD
    1. Lc 2.0/4 XX == ==     1. Lc 2.5/4 XX == B=
    2. Sf 2.0/4 == XX ==     2. Sf 2.0/4 == XX ==
    3. BD 2.0/4 0= == XX     3. BD 1.5/4 0= == XX


[Event "G/6'+3'' 8GBh Sy.6"]
[Site "R7 2700X 16 threads | RTX 2060"]
[Date "2020.12.05"]
[Round "2"]
[White "Stockfish_20112916"]
[Black "Black_Diamond-12r1"]
[Result "1/2-1/2"]
[ECO "C40"]
[Opening "Latvian Gambit"]
[Variation "Svedenborg, 6.Nxg6 hxg6"]
[TimeControl "360+3"]
[Termination "normal"]
[PlyCount "32"]
[WhiteType "human"]
[BlackType "human"]

1. e4 {book} e5 {book} 2. Nf3 {book} f5 {book} 3. Bc4 {book} fxe4 {book} 4.
Nxe5 {book} d5 {book} 5. Qh5+ {book} g6 {book} 6. Nxg6 {book} hxg6 {book}
7. Qxh8 {book, << white accepts the R <<} Kf7 {-0.29/26 0 31s} 8. Qd4 {+0.34/36 0 41s} Be6 {0.0027
5.5s} 9. Be2 {+0.10/37 0 13s} Nc6 {0.0028 9.0s} 10. Qe3 {+0.02/35 0 3.5s}
Bh6 {0.0029 5.8s} 11. Qg3 {0.0036 5.3s} Nd4 {0.0029 6.6s} 12. Bd1 {0.0040
7.2s} Nf5 {0.0024 16s} 13. Qh3 {0.0043 5.2s} Ne3 {0.0024 7.3s} 14. Qg3
{0.0045 7.0s} Nf5 {0.0028 80s} 15. Qh3 {0.0050 7.6s} Ne3 {0.0027 67s} 16.
Qg3 {0.0040 5.8s} Nf5 {0.0026 5.3s, Draw by 3-fold repetition} 1/2-1/2
[Event "G/6'+3'' 8GBh Sy.6"]
[Site "R7 2700X 16 threads | RTX 2060"]
[Date "2020.12.05"]
[Round "1"]
[White "Lc0v0.26.3_J96-44"]
[Black "Stockfish_20112916"]
[Result "1/2-1/2"]
[ECO "C40"]
[Opening "Latvian"]
[PlyCount "41"]
[TimeControl "360+3"]
[Variation "Polerio Variation"]

1.e4 {book} 1...e5 {book} 2.Nf3 {book} 2...f5 {book} 3.Bc4 {book} 3...fxe4 {book} 4.Nxe5 {book} 4...d5 {book} 5.Qh5+ {book} 5...g6 {book} 6.Nxg6 {book} 6...hxg6 {book} 7.Qxh8 {book, << white accepts the R <<} 7...Kf7 {0.00/38 34s} 8.Be2 {+0.05/15 7.7s} 8...Bg7 {-0.10/33 8.2s} 9.Qh7 {+0.06/20 4.8s} 9...Qg5 {0.00/36 5.4s} 10.g4 {+0.05/19 7.0s} 10...Bxg4 {0.00/41 5.2s} 11.h4 {+0.04/20 7.1s} 11...Qf4 {0.00/44 5.2s} 12.Bxg4 {+0.04/18 7.4s} 12...Nf6 {0.00/46 5.4s} 13.Be6+ {+0.04/16 6.6s} 13...Kxe6 {0.00/49 5.5s} 14.Qxg7 {+0.04/14 6.9s} 14...Qf3 {0.00/50 6.6s} 15.Rg1 {+0.01/12 35s} 15...Nc6 {0.00/47 7.8s} 16.Rxg6 {+0.02/13 2.9s} 16...Qh1+ {0.00/54 14s} 17.Rg1 {0.00/5 7.4s} 17...Qf3 {0.00/55 8.4s} 18.Rg6 {+0.01/5 0.22s} 18...Qh1+ {0.00/58 6.0s} 19.Rg1 {0.00/5 17s} 19...Qf3 {0.00/60 6.8s} 20.Rg3 {0.00/3 17s} 20...Qh1+ {0.00/74 12s} 21.Rg1 {0.00/2 12s, Draw by 3-fold repetition} 1/2-1/2
[Event "G/6'+3'' 8GBh Sy.6"]
[Site "R7 2700X | RTX 2060"]
[Date "2020.12.05"]
[Round "2"]
[White "Black_Diamond-12r1"]
[Black "Stockfish_20112916"]
[Result "1/2-1/2"]
[ECO "C40"]
[Opening "Latvian"]
[PlyCount "26"]
[TimeControl "360+3"]
[Variation "Polerio Variation"]

1.e4 {book} 1...e5 {book} 2.Nf3 {book} 2...f5 {book} 3.Bc4 {book} 3...fxe4 {book} 4.Nxe5 {book} 4...d5 {book} 5.Qh5+ {book} 5...g6 {book} 6.Nxg6 {book} 6...hxg6 {book} 7.Qxg6+ {book, << white declines the R and sacrifices its N <<} 7...Ke7 {0.00/45 18s} 8.d3 {0.00/23 37s} 8...Bh6 {0.00/49 5.0s} 9.Bxh6 {0.00/23 6.1s} 9...Nxh6 {0.00/54 6.6s} 10.Qg5+ {0.00/25 21s} 10...Ke6 {0.00/56 9.4s} 11.Qg6+ {0.00/26 26s} 11...Ke7 {0.00/57 6.9s} 12.Qg5+ {0.00/26 59s} 12...Ke6 {0.00/57 11s} 13.Qg6+ {0.00/27 65s} 13...Ke7 {0.00/63 12s, Draw by 3-fold repetition} 1/2-1/2
_  _  _  _ _  _  _  _ _  _  _  _
  

The 1 win vs. 11 draws.
After 25...Rxa8 material is white: R+R+7 pawns vs. black: R+B+N+N+3 pawns: [Event "G/6'+3'' 8GBh Sy.6"]
[Site "R7 2700X 16 threads | RTX 2060"]
[Date "2020.12.05"]
[Round "3"]
[White "Black_Diamond-12r1"]
[Black "Lc0v0.26.3_J96-44"]
[Result "0-1"]
[ECO "C40"]
[Opening "Latvian"]
[PlyCount "247"]
[Termination "adjudication"]
[TimeControl "360+3"]
[Variation "Polerio Variation"]

1.e4 {book} 1...e5 {book} 2.Nf3 {book} 2...f5 {book} 3.Bc4 {book} 3...fxe4 {book} 4.Nxe5 {book} 4...d5 {book} 5.Qh5+ {book} 5...g6 {book} 6.Nxg6 {book} 6...hxg6 {book} 7.Qxg6+ {book, << white declines the R and sacrifices its N <<} 7...Ke7 {-0.05/15 7.6s} 8.d4 {+0.11/23 57s} 8...e3 {-0.04/17 4.0s} 9.Bxe3 {0.00/28 7.7s} 9...Qd6 {-0.03/17 5.7s} 10.Bg5+ {+0.15/25 4.9s} 10...Kd7 {-0.06/17 5.6s} 11.Qf7+ {+0.19/25 6.3s} 11...Ne7 {-0.07/17 11s} 12.Be2 {+0.18/27 6.2s} 12...Qe6 {-0.06/14 19s} 13.Qxe6+ {+0.05/27 8.2s} 13...Kxe6 {-0.09/12 1.0s} 14.Nc3 {+0.03/26 24s} 14...Nbc6 {-0.06/17 12s} 15.Nb5 {+0.21/25 4.7s} 15...Kd7 {+0.03/24 12s} 16.Bf4 {+0.28/24 4.8s} 16...Bh6 {+0.03/26 6.9s} 17.Bg4+ {+0.75/24 5.0s} 17...Ke8 {+0.02/26 6.1s} 18.Nxc7+ {+0.46/29 12s} 18...Kd8 {+0.01/26 6.1s} 19.Bxh6 {+0.26/29 7.2s} 19...Bxg4 {+0.46/14 20s} 20.Nxa8 {+0.33/31 5.9s} 20...Rxh6 {+0.44/14 0.26s} 21.c3 {+0.38/28 7.0s} 21...Rh8 {+0.54/13 19s} 22.f3 {+0.36/26 6.8s} 22...Bf5 {+0.56/13 9.9s} 23.g4 {+0.26/29 41s} 23...Bh7 {+0.58/12 13s} 24.Kf2 {+0.22/25 10s} 24...Kd7 {+0.58/11 8.9s} 25.h4 {0.00/29 8.7s} 25...Rxa8 {+0.59/10 10s >>>> The strange material situation, the game continues after the next diagram:}
[FEN "r7/pp1kn2b/2n5/3p4/3P2PP/2P2P2/PP3K2/R6R w - - 0 26"]

26.a3 {0.00/31 11s} 26...Rf8 {+0.73/9 34s} 27.Kg3 {0.00/28 6.1s} 27...Nc8 {+0.70/10 16s} 28.h5 {0.00/143 7.8s} 28...Nd6 {+0.56/9 11s} 29.Rae1 {0.00/27 12s} 29...a5 {+0.55/9 6.5s} 30.Rh2 {0.00/27 8.4s} 30...a4 {+0.92/9 7.7s} 31.Rf2 {0.00/26 7.7s} 31...Rg8 {+0.90/9 18s} 32.Rh2 {0.00/101 8.4s} 32...Bd3 {+0.90/9 7.0s} 33.Kf4 {0.00/32 28s} 33...Nd8 {+1.16/10 8.0s} 34.Rd2 {0.00/29 9.0s} 34...Bb5 {+1.47/9 8.8s} 35.Kg3 {0.00/26 9.6s} 35...N8f7 {+1.44/9 15s} 36.Rf2 {0.00/33 56s} 36...Nf5+ {+1.71/9 7.9s} 37.Kg2 {0.00/24 4.9s} 37...Kd6 {+1.98/8 11s} 38.Kh2 {0.00/28 3.3s} 38...N5h6 {+1.91/8 10s} 39.Kg3 {0.00/28 8.4s} 39...Ng5 {+1.82/8 11s} 40.Rg2 {0.00/26 29s} 40...Bd7 {+1.69/7 14s} 41.Rgg1 {0.00/25 2.8s} 41...Nh7 {+1.58/7 13s} 42.Rh1 {0.00/22 4.8s} 42...Ng5 {+1.45/7 8.2s} 43.Kf4 {0.00/159 2.2s} 43...Bb5 {+1.56/8 11s} 44.Re5 {0.00/27 2.6s} 44...Ngf7 {+1.57/10 5.4s} 45.Re3 {0.00/24 3.3s} 45...Bd7 {+1.53/9 6.3s} 46.Rh2 {0.00/51 3.2s} 46...Ng5 {+1.73/8 9.6s} 47.Re1 {-0.07/25 10s} 47...Kc7 {+1.65/8 13s} 48.Rhh1 {0.00/24 2.0s} 48...Kc6 {+1.61/9 7.8s} 49.Re5 {0.00/27 12s} 49...Ngf7 {+1.53/9 8.2s} 50.Re7 {0.00/25 2.4s} 50...Kd6 {+1.51/9 4.8s} 51.Ree1 {0.00/24 1.7s} 51...b6 {+1.49/8 10s} 52.Rh2 {0.00/25 1.8s} 52...Ng5 {+1.60/8 4.4s} 53.Rhh1 {0.00/24 8.1s} 53...Kc6 {+1.53/8 7.4s} 54.Re5 {0.00/25 1.6s} 54...Nhf7 {+1.46/9 6.2s} 55.Ree1 {0.00/26 5.3s} 55...Kd6 {+1.46/8 5.1s} 56.Kg3 {0.00/25 2.9s} 56...Nh6 {+1.39/7 6.4s} 57.Kf4 {0.00/27 3.1s} 57...Bb5 {+1.38/8 5.4s} 58.Re5 {0.00/26 1.2s} 58...Ngf7 {+1.39/10 2.8s} 59.Re3 {0.00/26 4.8s} 59...Nd8 {+1.42/9 5.0s} 60.Re5 {0.00/27 2.1s} 60...Bd7 {+1.39/9 3.3s} 61.Kg3 {0.00/25 1.6s} 61...Ndf7 {+1.36/8 3.3s} 62.Ree1 {0.00/26 5.3s} 62...Kc6 {+1.37/7 7.6s} 63.Kf4 {0.00/22 3.0s} 63...Kc7 {+1.36/8 3.1s} 64.Reg1 {0.00/25 1.5s} 64...Ng5 {+1.49/8 3.6s} 65.Rh2 {0.00/23 3.3s} 65...Kd6 {+1.76/7 4.4s} 66.Re1 {0.00/24 2.9s} 66...Bc8 {+1.49/7 4.0s} 67.Rhh1 {0.00/23 2.2s} 67...Bd7 {+1.43/7 3.0s} 68.Rh2 {0.00/26 5.0s} 68...b5 {+1.39/7 3.9s} 69.Rhh1 {0.00/28 0.85s} 69...Nh7 {+1.36/7 3.5s} 70.Re5 {0.00/25 5.2s} 70...Nf7 {+1.29/7 2.0s} 71.Ree1 {0.00/26 3.0s} 71...Bc8 {+1.30/7 4.9s} 72.Rh2 {0.00/23 3.0s} 72...Be6 {+1.30/7 3.4s} 73.Kg3 {0.00/23 3.0s} 73...Nhg5 {+1.19/7 3.2s} 74.Kg2 {0.00/21 1.6s} 74...Nh6 {+1.14/7 3.0s} 75.Rh4 {-0.24/23 4.4s} 75...Rf8 {+1.18/6 3.4s} 76.Re3 {-0.06/25 1.4s} 76...Bd7 {+1.16/6 2.6s} 77.Kg3 {-0.06/26 1.9s} 77...Ra8 {+1.25/6 3.7s} 78.Rh2 {0.00/23 1.8s} 78...Rg8 {+1.21/6 3.0s} 79.Rg2 {0.00/25 6.6s} 79...Nh7 {+1.17/6 2.4s} 80.Re5 {0.00/24 1.8s} 80...Nf6 {+1.25/8 3.7s} 81.Kf4 {0.00/25 2.2s} 81...Nf7 {+1.20/9 0.99s} 82.Rg1 {0.00/26 1.7s} 82...Nh7 {+1.25/7 4.6s} 83.Re3 {0.00/27 6.5s} 83...Kc7 {+1.19/7 3.6s} 84.Re7 {0.00/29 1.6s} 84...Rf8 {+1.15/9 3.1s} 85.Kg3 {0.00/29 4.2s} 85...Nhg5 {+1.07/9 2.4s} 86.Ree1 {0.00/27 2.1s} 86...Kd6 {+1.14/6 3.2s} 87.Rh1 {0.00/24 2.5s} 87...Nh6 {+1.02/6 2.9s} 88.Rhf1 {0.00/26 4.7s} 88...Rg8 {+0.93/6 3.8s} 89.Rg1 {0.00/28 3.0s} 89...Kc6 {+0.91/6 2.9s} 90.Re5 {0.00/24 1.3s} 90...Nhf7 {+0.99/6 2.3s} 91.Re7 {0.00/25 3.4s} 91...Kd6 {+0.93/7 3.8s} 92.Ree1 {0.00/26 3.2s} 92...Nh7 {+0.93/6 3.2s} 93.Rg2 {0.00/24 2.3s} 93...Nf6 {+0.90/6 2.8s} 94.Rh1 {0.00/25 3.0s} 94...Ng5 {+0.95/6 2.6s} 95.Rgg1 {0.00/24 3.4s} 95...Rf8 {+0.82/6 3.3s} 96.Rf1 {0.00/22 1.8s} 96...b4 {+1.40/9 2.0s} 97.axb4 {0.00/28 1.5s} 97...Nfh7 {+1.45/10 1.4s} 98.Rhg1 {+0.03/24 2.1s} 98...Bb5 {+1.82/10 3.1s} 99.Rf2 {-0.88/27 7.5s} 99...Re8 {+1.94/10 1.7s} 100.Rd1 {-1.03/23 3.6s} 100...Re3 {+2.22/7 4.8s} 101.Kf4 {-1.07/22 1.2s} 101...Re6 {+2.01/8 5.0s} 102.Kg3 {-1.20/24 4.8s} 102...Ke7 {+2.21/9 2.4s} 103.Ra1 {-1.24/20 3.0s} 103...Re3 {+2.35/11 1.0s} 104.Kf4 {-1.32/22 3.0s} 104...Rd3 {+2.55/9 2.1s} 105.Re1+ {-1.42/21 3.0s} 105...Kf7 {+3.43/10 2.6s} 106.Rff1 {-1.59/22 3.0s} 106...Rd2 {+4.32/11 2.8s} 107.Rh1 {-1.92/22 3.0s} 107...Rg2 {+4.99/10 2.2s} 108.Ke5 {-1.98/22 1.2s} 108...Nxf3+ {+10.51/8 3.8s} 109.Kxd5 {-1.99/21 1.7s} 109...Nxe1 {+10.66/8 2.3s} 110.Rxe1 {-1.89/21 2.9s} 110...Rxb2 {+10.21/8 6.3s} 111.c4 {-2.20/21 6.2s} 111...Bd7 {+9.90/8 1.9s} 112.Kd6 {-2.09/19 3.0s} 112...Bxg4 {+10.59/8 2.4s} 113.Re7+ {-2.31/19 2.7s} 113...Kg8 {+10.32/8 2.2s} 114.Ra7 {-2.37/19 3.3s} 114...Rxb4 {+17.35/6 3.7s} 115.Kc5 {-2.54/19 3.0s} 115...Rb8 {+19.50/6 5.3s} 116.Rxa4 {-2.49/18 3.0s} 116...Nf6 {+21.98/5 4.5s} 117.d5 {-2.61/18 3.0s} 117...Bxh5 {+26.06/5 2.8s} 118.Ra7 {-2.74/16 3.0s} 118...Be2 {+24.29/5 3.2s} 119.Rc7 {-2.96/17 3.0s} 119...Kf8 {+24.61/5 3.0s} 120.Rc6 {-3.07/18 3.0s} 120...Kf7 {+24.98/6 2.8s} 121.Rc7+ {-5.09/18 3.0s} 121...Kg6 {+27.79/6 2.0s} 122.Kd4 {-64.10/24 3.0s} 122...Re8 {+23.55/5 4.2s} 123.Rc6 {-64.08/18 3.0s} 123...Kf5 {+21.75/5 2.8s} 124.Rc7 {-64.63/20 3.0s, Black wins by adjudication} 0-1
The same beginning moves through  25...Rxa8 as in the above game, then:
[Event "G/6'+3'' 8GBh Sy.6"]
[Site "R7 2700X 16 threads | RTX 2060"]
[Date "2020.12.05"]
[Round "1"]
[White "Stockfish_20112916"]
[Black "Lc0v0.26.3_J96-44"]
[Result "1/2-1/2"]
[ECO "C40"]
[Opening "Latvian"]
[PlyCount "108"]
[Termination "adjudication"]
[TimeControl "360+3"]
[Variation "Polerio Variation"]
[FEN "r7/pp1kn2b/2n5/3p4/3P2PP/2P2P2/PP3K2/R6R w - - 0 26"]

26.a4 {0.00/46 4.1s} 26...Rf8 {+0.59/9 27s} 27.Kg3 {0.00/47 13s} 27...Ng6 {+0.60/10 11s} 28.Rh2 {0.00/51 17s} 28...Nd8 {+0.60/10 21s} 29.Re1 {-0.13/46 48s} 29...Nf4 {+0.59/9 9.6s} 30.h5 {-0.08/41 4.1s} 30...Nde6 {+0.56/8 4.9s} 31.a5 {-0.52/37 7.4s} 31...Ra8 {+0.57/8 14s} 32.Re3 {-0.65/43 41s} 32...Kd6 {+0.55/9 9.9s} 33.Rh4 {-0.65/40 21s} 33...Nd3 {+0.66/13 6.4s} 34.Rh2 {-0.94/39 15s} 34...b5 {+0.69/12 7.3s} 35.axb6 {-0.82/36 3.2s} 35...axb6 {+0.69/12 4.0s} 36.Rd2 {-0.61/38 25s} 36...Ndf4 {+0.72/12 6.5s} 37.Re1 {-0.73/31 3.6s} 37...Ra2 {+0.80/11 12s} 38.Rc1 {-0.56/37 23s} 38...b5 {+0.88/11 16s} 39.Re1 {-0.50/27 1.2s} 39...Ke7 {+0.96/11 8.7s} 40.Rh2 {-0.91/35 3.9s} 40...Nd3 {+0.73/12 12s} 41.Rf1 {-0.51/28 1.6s} 41...b4 {+0.69/14 8.1s} 42.cxb4 {-0.44/28 2.3s} 42...Nxb4 {+0.70/15 8.0s} 43.f4 {-0.39/26 1.8s} 43...Nc6 {+0.68/14 8.6s} 44.f5 {-0.24/28 2.4s} 44...Ng5 {+0.71/14 12s} 45.Re1+ {-0.18/26 1.8s} 45...Kf6 {+0.38/15 9.6s} 46.Rd2 {-0.19/25 2.4s} 46...Ra4 {+0.36/17 8.6s} 47.Rd3 {-0.11/26 2.3s} 47...Rb4 {+0.28/15 21s} 48.Ra3 {0.00/30 2.0s} 48...Nxd4 {+0.23/15 9.6s} 49.Ra6+ {0.00/38 2.1s} 49...Kf7 {+0.23/15 0.26s} 50.Ra7+ {0.00/40 2.1s} 50...Kf8 {+0.21/14 4.2s} 51.Ra8+ {0.00/41 2.7s} 51...Kg7 {+0.26/17 8.4s} 52.Ra7+ {0.00/39 2.3s} 52...Kh8 {+0.85/14 7.0s} 53.Ra8+ {0.00/44 5.8s} 53...Kg7 {+0.11/15 15s} 54.Ra7+ {0.00/45 2.1s} 54...Kf8 {+0.11/16 3.2s, Draw by adjudication} 1/2-1/2
Attachment: post-LatvianSvedenborg.pgn - Games (22k)
Up Topic The Rybka Lounge / Test Positions / The 12 games of Latvian-Svedenborg

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