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Up Topic The Rybka Lounge / Computer Chess / 7 Queens each side, CPU engines (compared to Lc0 difficulty)
- By MrKris (**) Date 2019-04-01 03:41
Lc0 had difficulty with the variant: each side 7 queens + king on the 1st/8th ranks, 8 pawns as normal on 2nd/7th ranks;
losing to Stockfish in only 14 moves:
- https://groups.google.com/forum/#!topic/lczero/QdkQzN-jHMg

- I've never had a Houdini crash (1.5 to 6.03) except with this set up. It quickly played an illegal move in all its games.
- CPU engines, Game 9 minutes + 1 sec./move, AMD PhII X6 6-cpu, Syzygy 6, Arena 3.5.1, Win10
Excluding Houdini's: 12 games ending normally, 75% draws, black won 2, white won 1.
- The shortest win here was 56 moves:

[Event "7-Queens-each"]
[Site "Arena"]
[Date "2019.03.31"]
[Round "2"]
[White "ShashChess 7.0-x86-64-modern"]
[Black "Komodo-12.2.2"]
[Result "0-1"]
[BlackElo "2200"]
[ECO "Shuffl"]
[Opening "e Chess"]
[Time "07:45:13"]
[WhiteElo "2200"]
[TimeControl "540+1"]
[SetUp "1"]
[FEN "qqqqkqqq/pppppppp/8/8/8/8/PPPPPPPP/QQQQKQQQ w - - 0 1"]
[Termination "normal"]
[PlyCount "111"]
[WhiteType "human"]
[BlackType "human"]

1. d4 {+0.22/24 38} c5 {+0.03/23 12} 2. d5 {+0.36/24 3} g6 {-0.01/24 21} 3.
e4 {+0.48/21 4} f5 {-0.01/23 23} 4. Qfe2 {+0.49/23 13} c4 {-0.03/23 13} 5.
Kf1 {+0.53/23 16} b5 {+0.01/23 11} 6. g3 {+0.67/22 5} Qhe5 {0.00/23 8} 7.
Qcd2 {+0.59/23 35} Qbd6 {+0.27/23 11} 8. c3 {+0.03/24 19} Qcb7 {+0.35/22
11} 9. Qgg2 {-0.12/23 7} Qff7 {+0.20/24 10} 10. Qef3 {-0.19/24 6} Qd8b6
{+0.28/24 10} 11. b4 {-0.14/22 6} a5 {+0.30/23 14} 12. Qab2 {-0.09/23 10}
axb4 {+0.35/23 13} 13. Qxb4 {-0.04/21 2} Qgg7 {+0.29/23 13} 14. Q1e1
{-0.28/26 66} Qgf6 {+0.31/23 16} 15. Qxd6 {-0.19/22 8} Qbxd6 {+0.39/25 14}
16. Kg1 {-0.34/23 6} Kd8 {+0.50/24 20} 17. Qfd1 {-0.24/25 23} Qbb6
{+0.52/23 11} 18. Qgf3 {-0.19/20 5} f4 {+0.58/25 14} 19. Qhg2 {-0.24/20 4}
Qaa3 {+0.62/25 20} 20. Qbc2 {-0.36/22 26} g5 {+0.71/25 16} 21. Kh1
{-0.30/22 18} Qba5 {+0.71/24 10} 22. Qh3 {-0.14/19 2} Q7g7 {+0.94/24 11}
23. gxf4 {-0.60/25 31} gxf4 {+0.98/25 15} 24. Qd1c1 {-0.42/21 3} Qfg5
{+0.98/23 7} 25. Qhf1 {-0.83/23 9} Qdh6 {+1.74/23 6} 26. Qg1 {-1.38/28 38}
Qad6 {+1.66/25 11} 27. Qxg5 {-0.52/21 1} Qhxg5 {+1.95/25 8} 28. Qf1
{-1.35/26 27} Qdh6 {+2.03/26 9} 29. Qdd1 {-1.06/23 1} Qaa6 {+4.09/27 8} 30.
h3 {-0.69/22 5} Qgh4 {+4.17/28 6} 31. d6 {-2.49/23 12} Qaxd6 {+4.41/30 13}
32. Qxd6 {-3.34/27 5} exd6 {+4.48/30 7} 33. Qc1d1 {-3.42/27 3} Qgg6
{+4.76/31 8} 34. Kh2 {-3.91/28 8} Qgh5 {+5.04/31 7} 35. Qxh5 {-4.66/31 24}
Qexh5 {+5.14/33 10} 36. Qxh5 {-4.84/30 8} Q6xh5 {+5.28/31 7} 37. Qd2
{-4.91/28 3} Qe5 {+5.45/31 10} 38. f3 {-4.91/29 24} Qg7 {+5.48/31 13} 39.
Kh1 {-4.88/26 3} Qgg3 {+5.61/31 7} 40. Qxd6 {-4.57/29 7} Qhxh3+ {+5.99/23
3} 41. Qxh3 {-4.57/1} Qxh3+ {+6.88/26 17} 42. Kg1 {-4.57/1} Qg3+ {+8.48/21
4} 43. Kf1 {-5.28/26 9} Qxf3+ {+9.87/24 11} 44. Kg1 {-5.31/28 10} Qe3+
{+10.57/21 9} 45. Kh2 {-5.45/25} Qf2+ {+10.52/22 9} 46. Kh1 {-5.31/25 1}
Qe1+ {+10.67/18 4} 47. Kh2 {-5.52/25 1} Qxe4 {+9.72/22 5} 48. Qf8+
{-4.82/17} Kc7 {+11.62/23 6} 49. Qc5+ {-5.38/21 5} Qc6 {+13.31/22 2} 50.
Qa7+ {-5.71/23 3} Kc8 {+16.28/21 3} 51. a3 {-5.51/20} Qh6+ {+250.00/20} 52.
Kg2 {-4.81/18 1} Qg6+ {+250.00/21} 53. Kf1 {-66.17/25 1} Qd3+ {+250.00/23}
54. Kg2 {-77.70/25 1} Qe2+ {+250.00/24} 55. Kh1 {-78.14/24} Qf3+
{+250.00/24 1} 56. Kh2 {-107.15/29 1  White resigns} 0-1
                           Score CF Ko St Sh Ho Ho    S-B
1: CFish_10 modern        7.5/10 ·· == == =W 11 11   27.75
2: Komodo-12.2.2          7.0/10 == ·· == 0B 11 11   25.00
2: Stockfish_19032417m    7.0/10 == == ·· == 11 11   25.00
4: ShashChess 7.0-modern  6.5/10 =0 B0 == ·· 11 11   21.75
5: Houdini-6_Tactical=3   1.0/10 00 00 00 00 ·· 01    1.00
5: Houdini 6.03 standard  1.0/10 00 00 00 00 10 ··    1.00

All Houdini games ended by 'rules infraction' 'illegal move'
with 1 to 10 plies played.
(Same settings, TC, GUI, with normal initial postion:
Houdini 1/2-1/2 Houdini Tac. adj. @ 40 moves, working fine.)
[Event "7-Queens-each"]
[Site "Arena"]
[Date "2019.03.31"]
[Round "2"]
[White "Houdini-6-copy"]
[Black "Houdini 6.03 standard"]
[Result "1-0"]
[BlackElo "2200"]
[ECO "Shuffl"]
[Opening "e Chess"]
[Time "07:04:28"]
[WhiteElo "2200"]
[TimeControl "540+1"]
[SetUp "1"]
[FEN "qqqqkqqq/pppppppp/8/8/8/8/PPPPPPPP/QQQQKQQQ w - - 0 1"]
[Termination "rules infraction"]
[PlyCount "1"]
[WhiteType "human"]
[BlackType "human"]

1. d4 {+0.26/22 55 .  Arena Adjudication. Illegal move!} 1-0
- By QueensideCastler (**) Date 2019-04-08 16:03
CuteChess and GUI allow such positions. I'd rather have Komodo as black against Stockfish as white. Because Komodo has multiple queens penalty, Stockfish does not.

Multiple queens are redundant. The real problem is that the board is just too small for two ♕s if there are a fair number of pieces on the board.

Compare Karpov vs Korchnoi, 1994 Korchnoi learned from Korchnoi vs E German, 1962, where he had drawn with a weaker player despite obtaining two ♕s. Korchnoi explained:

"During the analysis, I discovered something very remarkable: the board is simply too small for two Queens of the same color. They only get in each other's way. I realize that this might sound stupid, but I fully mean it. The advantage is much less than one would expect by counting material."

Look at this game: http://www.chessgames.com/perl/chessgame?gid=1628143
Up Topic The Rybka Lounge / Computer Chess / 7 Queens each side, CPU engines (compared to Lc0 difficulty)

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