This position is from a Sage test game. Sage played Na2+ and this move obviously loses. The question is whether Na4+ or Nb1+ is best, and can Black win from this position?
[d]8/8/8/Q7/2p2P2/2N5/1pqk4/7K w - - 0 1
Regards
Dave
endgame test position
Moderator: Ras
-
David Dahlem
- Posts: 900
- Joined: Wed Mar 08, 2006 9:06 pm
Re: endgame test position
Here is the complete game. Interesting endgame. I thought for sure Sage could draw but blundered on move 95.
[Event "Queen-Sage Gauntlet"]
[Site "?"]
[Date "2008.02.15"]
[Round "12"]
[White "Sage 3.45c"]
[Black "Queen 4.02"]
[Result "0-1"]
1.e4 c6 2.d3 d5 3.Nd2 g6 4.g3 Bg7 5.Bg2 e5 6.Ngf3 Ne7 7.O-O {+0.27/10} O-O {-0.02/9} 8.Nb3 {+0.17/11} Na6 {-0.36/9} 9.Bd2 {+0.21/10} Qd6 {-0.23/8} 10.Re1 {+0.18/10} Be6 {-0.19/9} 11.d4 {+0.21/10} exd4 {-0.01/10} 12.e5 {+0.21/10} Qd7 {+0.01/11} 13.Nbxd4 {+0.21/11} Bg4 {0.00/11} 14.Bg5 {+0.10/10} Rae8 {+0.09/10} 15.Qd2 {+0.17/11} c5 {+0.01/10} 16.Nb3 {-0.14/11} Nc6 {-0.01/10} 17.Bf4 {-0.09/10} b6 {+0.33/9} 18.Nh4 {-0.05/9} Nc7 {+0.96/9} 19.f3 {-0.61/10} Bh3 {+1.00/10} 20.Bh6 {-0.80/10} Nxe5 {+1.00/10} 21.Bxg7 {-1.28/9} Kxg7 {+1.97/10} 22.f4 {-1.59/10} Nc4 {+1.85/10} 23.Qd3 {-2.21/10} Bxg2 {+2.01/9} 24.Qc3+ {-2.29/9} f6 {+2.72/10} 25.Nxg2 {-2.64/11} Nb5 {+2.58/12} 26.Qf3 {-2.53/11} Nxb2 {+2.70/11} 27.Rab1 {-2.73/10} Nc4 {+2.93/9} 28.Red1 {-2.88/11} Red8 {+2.94/9} 29.Rde1 {-2.91/10} Qh3 {+2.94/9} 30.Re2 {-2.57/9} Nc7 {+2.87/9} 31.Rbe1 {-2.63/10} Kg8 {+2.49/9} 32.Nh4 {-2.73/11} Nd6 {+2.60/8} 33.Qg2 {-3.12/11} Qc8 {+2.68/9} 34.R2e7 {-2.74/10} Rde8 {+3.04/11} 35.R7e2 {-3.52/11} Rxe2 {+3.10/10} 36.Rxe2 {-3.55/10} Re8 {+3.24/10} 37.Nf3 {-3.61/10} Ne4 {+3.32/9} 38.Re1 {-3.54/10} Qd7 {+3.36/9} 39.Nc1 {-3.55/10} c4 {+3.49/8} 40.Kh1 {-3.53/10} Kh8 {+3.50/7} 41.Rf1 {-3.44/11} a6 {+3.50/9} 42.Nd4 {-3.54/11} f5 {+3.37/9} 43.Re1 {-3.36/11} Qa4 {+3.46/9} 44.Qg1 {-3.39/12} b5 {+3.48/9} 45.Re2 {-3.17/12} b4 {+3.42/10} 46.Nf3 {-3.43/12} Nb5 {+3.56/11} 47.Ne5 {-3.32/11} Qa3 {+3.58/11} 48.Rg2 {-3.43/11} Re6 {+3.58/10} 49.h3 {-3.45/11} Qb2 {+3.55/9} 50.Ne2 {-3.93/11} Kg8 {+3.35/9} 51.Qd1 {-3.98/12} Rd6 {+3.55/10} 52.Nc1 {-3.86/12} h6 {+3.58/10} 53.Kh2 {-3.93/11} Kg7 {+3.49/9} 54.Qg1 {-3.59/11} Qc3 {+3.49/9} 55.Kh1 {-3.64/12} a5 {+3.51/9} 56.Ne2 {-3.41/11} Qb2 {+3.50/10} 57.Nc1 {-3.52/11} Kg8 {+3.00/9} 58.g4 {-3.47/11} fxg4 {+3.36/11} 59.Rxg4 {-3.19/10} g5 {+3.40/10} 60.Rg2 {-3.41/11} Kf8 {+3.39/9} 61.h4 {-3.81/10} Ke8 {+3.36/9} 62.hxg5 {-3.80/9} hxg5 {+3.42/10} 63.Ne2 {-3.78/10} Qxa2 {+2.45/9} 64.Qh2 {-3.75/10} Qxc2 {+1.92/10} 65.Qh8+ {-3.70/8} Ke7 {0.00/1} 66.Qg7+ {-3.35/9} Kd8 {+1.97/10} 67.Nf7+ {-3.21/10} Kc8 {+2.00/10} 68.Nxd6+ {-3.21/9} Nexd6 {+1.86/9} 69.Qg8+ {-3.23/11} Kc7 {+2.10/10} 70.Qxd5 {-3.23/10} b3 {+4.13/10} 71.Qxg5 {-4.15/10} b2 {+3.40/10} 72.Qc5+ {-3.97/10} Kd8 {+3.75/10} 73.Rg8+ {-4.09/10} Ke7 {+3.80/10} 74.Qg5+ {-4.09/9} Ke6 {+3.80/9} 75.Rg6+ {-3.44/10} Kd7 {+3.93/11} 76.Rxd6+ {-3.54/10} Nxd6 {+4.33/11} 77.Qg7+ {-5.57/12} Kc8 {+1.71/12} 78.Qf8+ {-2.73/12} Kb7 {+0.79/14} 79.Qe7+ {-0.94/12} Ka8 {+0.80/13} 80.Qd8+ {-0.96/13} Ka7 {+0.80/13} 81.Qd7+ {-1.15/14} Nb7 {+0.65/14} 82.Qd4+ {-0.64/15} Kb8 {+0.61/15} 83.Qe5+ {0.00/16} Kc8 {+0.61/14} 84.Qe6+ {0.00/15} Kc7 {0.00/15} 85.Qe7+ {0.00/15} Kb6 {+0.05/15} 86.Qf6+ {0.00/14} Kc5 {+0.03/14} 87.Qe7+ {0.00/15} Nd6 {+0.03/14} 88.Qe5+ {0.00/13} Kb4 {+0.49/14} 89.Qxd6+ {0.00/13} Kb3 {+0.11/14} 90.Qb6+ {0.00/13} Ka2 {+0.05/14} 91.Qxa5+ {0.00/11} Kb1 {+0.01/14} 92.Nc3+ {0.00/12} Kc1 {+1.35/11} 93.Na2+ {0.00/11} Kd1 {+1.46/11} 94.Nc3+ {0.00/9} Kd2 {+2.03/11} 95.Na2+ {-0.26/11} Ke3 {+2.88/11} 96.Qc5+ {-0.26/10} Ke2 {+3.09/12} 97.Qh5+ {0.00/10} Ke1 {+3.09/13} 98.Qh4+ {-0.23/10} Qf2 {+3.59/14} 99.Qh7 {-9.20/12} Qf1+ {+9.91/12} 100.Kh2 Kd2 {+10.18/13} 101.Qf5 {-12.15/11} Qe2+ {+10.64/12} 102.Kg1 {-12.96/12} Qe1+ {+10.88/12} 103.Kg2 {-M18/50} {0-1 Arena Adjudication} 0-1
Regards
Dave
[Event "Queen-Sage Gauntlet"]
[Site "?"]
[Date "2008.02.15"]
[Round "12"]
[White "Sage 3.45c"]
[Black "Queen 4.02"]
[Result "0-1"]
1.e4 c6 2.d3 d5 3.Nd2 g6 4.g3 Bg7 5.Bg2 e5 6.Ngf3 Ne7 7.O-O {+0.27/10} O-O {-0.02/9} 8.Nb3 {+0.17/11} Na6 {-0.36/9} 9.Bd2 {+0.21/10} Qd6 {-0.23/8} 10.Re1 {+0.18/10} Be6 {-0.19/9} 11.d4 {+0.21/10} exd4 {-0.01/10} 12.e5 {+0.21/10} Qd7 {+0.01/11} 13.Nbxd4 {+0.21/11} Bg4 {0.00/11} 14.Bg5 {+0.10/10} Rae8 {+0.09/10} 15.Qd2 {+0.17/11} c5 {+0.01/10} 16.Nb3 {-0.14/11} Nc6 {-0.01/10} 17.Bf4 {-0.09/10} b6 {+0.33/9} 18.Nh4 {-0.05/9} Nc7 {+0.96/9} 19.f3 {-0.61/10} Bh3 {+1.00/10} 20.Bh6 {-0.80/10} Nxe5 {+1.00/10} 21.Bxg7 {-1.28/9} Kxg7 {+1.97/10} 22.f4 {-1.59/10} Nc4 {+1.85/10} 23.Qd3 {-2.21/10} Bxg2 {+2.01/9} 24.Qc3+ {-2.29/9} f6 {+2.72/10} 25.Nxg2 {-2.64/11} Nb5 {+2.58/12} 26.Qf3 {-2.53/11} Nxb2 {+2.70/11} 27.Rab1 {-2.73/10} Nc4 {+2.93/9} 28.Red1 {-2.88/11} Red8 {+2.94/9} 29.Rde1 {-2.91/10} Qh3 {+2.94/9} 30.Re2 {-2.57/9} Nc7 {+2.87/9} 31.Rbe1 {-2.63/10} Kg8 {+2.49/9} 32.Nh4 {-2.73/11} Nd6 {+2.60/8} 33.Qg2 {-3.12/11} Qc8 {+2.68/9} 34.R2e7 {-2.74/10} Rde8 {+3.04/11} 35.R7e2 {-3.52/11} Rxe2 {+3.10/10} 36.Rxe2 {-3.55/10} Re8 {+3.24/10} 37.Nf3 {-3.61/10} Ne4 {+3.32/9} 38.Re1 {-3.54/10} Qd7 {+3.36/9} 39.Nc1 {-3.55/10} c4 {+3.49/8} 40.Kh1 {-3.53/10} Kh8 {+3.50/7} 41.Rf1 {-3.44/11} a6 {+3.50/9} 42.Nd4 {-3.54/11} f5 {+3.37/9} 43.Re1 {-3.36/11} Qa4 {+3.46/9} 44.Qg1 {-3.39/12} b5 {+3.48/9} 45.Re2 {-3.17/12} b4 {+3.42/10} 46.Nf3 {-3.43/12} Nb5 {+3.56/11} 47.Ne5 {-3.32/11} Qa3 {+3.58/11} 48.Rg2 {-3.43/11} Re6 {+3.58/10} 49.h3 {-3.45/11} Qb2 {+3.55/9} 50.Ne2 {-3.93/11} Kg8 {+3.35/9} 51.Qd1 {-3.98/12} Rd6 {+3.55/10} 52.Nc1 {-3.86/12} h6 {+3.58/10} 53.Kh2 {-3.93/11} Kg7 {+3.49/9} 54.Qg1 {-3.59/11} Qc3 {+3.49/9} 55.Kh1 {-3.64/12} a5 {+3.51/9} 56.Ne2 {-3.41/11} Qb2 {+3.50/10} 57.Nc1 {-3.52/11} Kg8 {+3.00/9} 58.g4 {-3.47/11} fxg4 {+3.36/11} 59.Rxg4 {-3.19/10} g5 {+3.40/10} 60.Rg2 {-3.41/11} Kf8 {+3.39/9} 61.h4 {-3.81/10} Ke8 {+3.36/9} 62.hxg5 {-3.80/9} hxg5 {+3.42/10} 63.Ne2 {-3.78/10} Qxa2 {+2.45/9} 64.Qh2 {-3.75/10} Qxc2 {+1.92/10} 65.Qh8+ {-3.70/8} Ke7 {0.00/1} 66.Qg7+ {-3.35/9} Kd8 {+1.97/10} 67.Nf7+ {-3.21/10} Kc8 {+2.00/10} 68.Nxd6+ {-3.21/9} Nexd6 {+1.86/9} 69.Qg8+ {-3.23/11} Kc7 {+2.10/10} 70.Qxd5 {-3.23/10} b3 {+4.13/10} 71.Qxg5 {-4.15/10} b2 {+3.40/10} 72.Qc5+ {-3.97/10} Kd8 {+3.75/10} 73.Rg8+ {-4.09/10} Ke7 {+3.80/10} 74.Qg5+ {-4.09/9} Ke6 {+3.80/9} 75.Rg6+ {-3.44/10} Kd7 {+3.93/11} 76.Rxd6+ {-3.54/10} Nxd6 {+4.33/11} 77.Qg7+ {-5.57/12} Kc8 {+1.71/12} 78.Qf8+ {-2.73/12} Kb7 {+0.79/14} 79.Qe7+ {-0.94/12} Ka8 {+0.80/13} 80.Qd8+ {-0.96/13} Ka7 {+0.80/13} 81.Qd7+ {-1.15/14} Nb7 {+0.65/14} 82.Qd4+ {-0.64/15} Kb8 {+0.61/15} 83.Qe5+ {0.00/16} Kc8 {+0.61/14} 84.Qe6+ {0.00/15} Kc7 {0.00/15} 85.Qe7+ {0.00/15} Kb6 {+0.05/15} 86.Qf6+ {0.00/14} Kc5 {+0.03/14} 87.Qe7+ {0.00/15} Nd6 {+0.03/14} 88.Qe5+ {0.00/13} Kb4 {+0.49/14} 89.Qxd6+ {0.00/13} Kb3 {+0.11/14} 90.Qb6+ {0.00/13} Ka2 {+0.05/14} 91.Qxa5+ {0.00/11} Kb1 {+0.01/14} 92.Nc3+ {0.00/12} Kc1 {+1.35/11} 93.Na2+ {0.00/11} Kd1 {+1.46/11} 94.Nc3+ {0.00/9} Kd2 {+2.03/11} 95.Na2+ {-0.26/11} Ke3 {+2.88/11} 96.Qc5+ {-0.26/10} Ke2 {+3.09/12} 97.Qh5+ {0.00/10} Ke1 {+3.09/13} 98.Qh4+ {-0.23/10} Qf2 {+3.59/14} 99.Qh7 {-9.20/12} Qf1+ {+9.91/12} 100.Kh2 Kd2 {+10.18/13} 101.Qf5 {-12.15/11} Qe2+ {+10.64/12} 102.Kg1 {-12.96/12} Qe1+ {+10.88/12} 103.Kg2 {-M18/50} {0-1 Arena Adjudication} 0-1
Regards
Dave
-
Eelco de Groot
- Posts: 4681
- Joined: Sun Mar 12, 2006 2:40 am
- Full name: Eelco de Groot
Re: endgame test position
Hello David,
Toga Checkov would have played 95.Nb1+ I think but within the first seconds it also plays Na2 and that seems to remain in second spot for a long time. I can't do multivariation analysis that would have been the best way to look at the choices here. The eval is a pawn and a half but it does not seem to be growing.
Eelco
8/8/8/Q7/2p2P2/2N5/1pqk4/7K w - -
Engine: Toga 1.4 Checkov Beta 3 bb5 (256 MB)
by Thomas Gaksch and Fabien Letouzey
1/09 0:00 -3.26 1.Kg1 Qxc3 (112)
1/12 0:00 -3.14 1.Kg2 Qxc3 (771)
1/13 0:00 +0.97 1.Nb1+ Ke3 (2.011)
1/18 0:00 +1.23 1.Ne4+ Ke3 (13.341)
2/18 0:00 +0.02 1.Ne4+ Ke3 2.Qb6+ Kxf4 3.Qf6+ Ke3 (43.668)
2/18 0:00 +0.88 1.Nb1+ Ke3 2.Qe5+ Kf3 (44.824)
3/23 0:00 -0.35 1.Nb1+ Ke3 2.Qb6+ Kxf4 3.Qf6+ Ke3
4.Qb6+ Kf3 5.Qc6+ Kg4 6.Qe6+ Kh4
7.Qf6+ Kg4 (66.396)
4/23 0:00 -0.33 1.Nb1+ Ke2 2.Na3 b1Q+ 3.Nxb1 Qxb1+
4.Kh2 Qh7+ 5.Kg3 Qd3+ 6.Kg4 Qf3+
7.Kg5 (135.829)
5/23 0:00 -0.36 1.Nb1+ Ke3 2.Qb6+ Ke2 3.Qe6+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd4+ Kg6 (185.345)
6/25 0:00 -0.35 1.Nb1+ Ke3 2.Qb6+ Ke2 3.Qe6+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd4+ Kg6 8.Qd6+ Kh7 9.Qe7+ Kh6
10.Qf6+ Kh5 (271.680)
7/27 0:00 -0.35 1.Nb1+ Ke3 2.Qb6+ Ke2 3.Qe6+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd6+ Kf7 8.Qd5+ Kg6 9.Qd6+ Kh7
10.Qe7+ Kh6 11.Qf6+ Kh5 (479.876)
8/30 0:01 -0.31 1.Nb1+ Ke3 2.Qb6+ Ke2 3.Qe6+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kg4
7.Qe6+ Kg5 8.Qe5+ Kh4 9.Qf6+ Kh5
10.Qe5+ Kg6 (865.679) 850
9/35 0:02 -1.18 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe4+ 5.Kg3 b1Q 6.Qc3+ Qbc2
7.Nxc2 Qxc2 8.Qa3+ Kd2 9.Qf3 Qg6+
10.Kf2 (2.349.194) 865
9/35 0:04 -0.16 1.Na2+ Ke3 2.Qc5+ Kxf4 3.Qd6+ Kf3
4.Qf6+ Ke2 5.Qe5+ Kf1 6.Qf4+ Ke1
7.Qe5+ Qe2 8.Qg3+ Qf2 9.Qg6 Qd2 (4.389.816) 904
10/35 0:06 -1.42 1.Na2+ Ke2 2.Qh5+ Ke1 3.Qh4+ Qf2
4.Qxf2+ Kxf2 5.Nc3 Ke3 6.f5 Kd4
7.Nb1 Ke5 8.Kg2 Kxf5 9.Nc3 (5.875.079) 921
10/35 0:07 -1.11 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kh3 Qe3+ 5.Kg4 b1Q 6.Nxb1 Qe4+
7.Kg5 Kxb1 8.Qc3 Qd3 9.Qb4+ Kc2
10.Qa4+ Kd2 (7.013.928) 925
11/35 0:12 -1.02 1.Nb1+ Kc1 2.Nc3 Qd3 3.Na2+ Kd1
4.Qb5 Qe4+ 5.Kg1 Qg6+ 6.Kh1 Qh7+
7.Kg2 Qc2+ 8.Kf3 Kd2 9.Qb4+ c3
10.Qd6+ Qd3+ 11.Qxd3+ Kxd3 12.Nb4+ Kc4 (11.184.266) 908
12/39 0:18 -1.26 1.Nb1+ Kc1 2.Nc3 Qd3 3.Na2+ Kd1
4.Qb5 Qf1+ 5.Kh2 Qxf4+ 6.Kh3 Qd2
7.Kg3 Qd3+ 8.Kg4 b1R 9.Nc3+ Qxc3
10.Qxb1+ Qc1 11.Qe4 c3 12.Qf3+ Kc2 (16.960.012) 904
13/41 0:28 -1.24 1.Nb1+ Kc1 2.Nc3 Qd3 3.Na2+ Kd1
4.Qb5 Qf1+ 5.Kh2 Qxf4+ 6.Kh3 Qd2
7.Kg3 Qd3+ 8.Kg4 b1R 9.Nc3+ Qxc3
10.Qxb1+ Qc1 11.Qe4 c3 12.Qf3+ Ke1
13.Qg3+ Kd2 14.Qf4+ (26.313.870) 912
14/42 0:58 -1.30 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qd2+ 6.Kf3 c2 7.Qc5 b1Q
8.Nxb1 Kxb1 9.Qb5+ Ka2 10.Qc4+ Kb2
11.Qb5+ Ka3 12.Qc5+ Kb3 13.Qb5+ Qb4
14.Qd5+ (53.776.490) 925
15/48 2:13 -1.53 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kh3 Qe3+ 5.Kg4 b1Q 6.Nxb1 Qe4+
7.Kg5 Kxb1 8.Qb4+ Kc2 9.Qa4+ Kd2
10.Qb4+ Kd1 11.Qa4+ Ke2 12.Qa6 Qe3+
13.Kh5 Qe5+ 14.Kg4 (126.744.854) 952
16/48 5:48 -1.56 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 b1Q
8.Nxb1 Kxb1 9.Qb4+ Kc1 10.Qd4 Qe1+
11.Kh3 Kb1 12.Qd3 Qh1+ 13.Kg3 Qg1+
14.Kh4 (345.624.899) 991
17/49 17:44 -1.61 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 b1Q
8.Nxb1 Kxb1 9.Qb4+ Kc1 10.Qd4 Qe1+
11.Kh3 Kb1 12.Qd3 Qb4 13.Kg4 Kb2
14.Qe2 (1.128.785.584) 1060
18/51 39:08 -1.53 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 b1Q
8.Nxb1 Qd3+ 9.Kf2 Kxb1 10.Qb6+ Ka2
11.Qa5+ Kb2 12.Qe5+ Kb1 13.Qb8+ Kc1
14.Qe5 (2.487.046.382) 1059
best move: Nc3-b1 time: 46:49.407 min n/s: 1.046.770 CPU 100.0% n/s(1CPU): 1.046.770 nodes: 2.940.590.000
Toga Checkov would have played 95.Nb1+ I think but within the first seconds it also plays Na2 and that seems to remain in second spot for a long time. I can't do multivariation analysis that would have been the best way to look at the choices here. The eval is a pawn and a half but it does not seem to be growing.
Eelco
8/8/8/Q7/2p2P2/2N5/1pqk4/7K w - -
Engine: Toga 1.4 Checkov Beta 3 bb5 (256 MB)
by Thomas Gaksch and Fabien Letouzey
1/09 0:00 -3.26 1.Kg1 Qxc3 (112)
1/12 0:00 -3.14 1.Kg2 Qxc3 (771)
1/13 0:00 +0.97 1.Nb1+ Ke3 (2.011)
1/18 0:00 +1.23 1.Ne4+ Ke3 (13.341)
2/18 0:00 +0.02 1.Ne4+ Ke3 2.Qb6+ Kxf4 3.Qf6+ Ke3 (43.668)
2/18 0:00 +0.88 1.Nb1+ Ke3 2.Qe5+ Kf3 (44.824)
3/23 0:00 -0.35 1.Nb1+ Ke3 2.Qb6+ Kxf4 3.Qf6+ Ke3
4.Qb6+ Kf3 5.Qc6+ Kg4 6.Qe6+ Kh4
7.Qf6+ Kg4 (66.396)
4/23 0:00 -0.33 1.Nb1+ Ke2 2.Na3 b1Q+ 3.Nxb1 Qxb1+
4.Kh2 Qh7+ 5.Kg3 Qd3+ 6.Kg4 Qf3+
7.Kg5 (135.829)
5/23 0:00 -0.36 1.Nb1+ Ke3 2.Qb6+ Ke2 3.Qe6+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd4+ Kg6 (185.345)
6/25 0:00 -0.35 1.Nb1+ Ke3 2.Qb6+ Ke2 3.Qe6+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd4+ Kg6 8.Qd6+ Kh7 9.Qe7+ Kh6
10.Qf6+ Kh5 (271.680)
7/27 0:00 -0.35 1.Nb1+ Ke3 2.Qb6+ Ke2 3.Qe6+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd6+ Kf7 8.Qd5+ Kg6 9.Qd6+ Kh7
10.Qe7+ Kh6 11.Qf6+ Kh5 (479.876)
8/30 0:01 -0.31 1.Nb1+ Ke3 2.Qb6+ Ke2 3.Qe6+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kg4
7.Qe6+ Kg5 8.Qe5+ Kh4 9.Qf6+ Kh5
10.Qe5+ Kg6 (865.679) 850
9/35 0:02 -1.18 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe4+ 5.Kg3 b1Q 6.Qc3+ Qbc2
7.Nxc2 Qxc2 8.Qa3+ Kd2 9.Qf3 Qg6+
10.Kf2 (2.349.194) 865
9/35 0:04 -0.16 1.Na2+ Ke3 2.Qc5+ Kxf4 3.Qd6+ Kf3
4.Qf6+ Ke2 5.Qe5+ Kf1 6.Qf4+ Ke1
7.Qe5+ Qe2 8.Qg3+ Qf2 9.Qg6 Qd2 (4.389.816) 904
10/35 0:06 -1.42 1.Na2+ Ke2 2.Qh5+ Ke1 3.Qh4+ Qf2
4.Qxf2+ Kxf2 5.Nc3 Ke3 6.f5 Kd4
7.Nb1 Ke5 8.Kg2 Kxf5 9.Nc3 (5.875.079) 921
10/35 0:07 -1.11 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kh3 Qe3+ 5.Kg4 b1Q 6.Nxb1 Qe4+
7.Kg5 Kxb1 8.Qc3 Qd3 9.Qb4+ Kc2
10.Qa4+ Kd2 (7.013.928) 925
11/35 0:12 -1.02 1.Nb1+ Kc1 2.Nc3 Qd3 3.Na2+ Kd1
4.Qb5 Qe4+ 5.Kg1 Qg6+ 6.Kh1 Qh7+
7.Kg2 Qc2+ 8.Kf3 Kd2 9.Qb4+ c3
10.Qd6+ Qd3+ 11.Qxd3+ Kxd3 12.Nb4+ Kc4 (11.184.266) 908
12/39 0:18 -1.26 1.Nb1+ Kc1 2.Nc3 Qd3 3.Na2+ Kd1
4.Qb5 Qf1+ 5.Kh2 Qxf4+ 6.Kh3 Qd2
7.Kg3 Qd3+ 8.Kg4 b1R 9.Nc3+ Qxc3
10.Qxb1+ Qc1 11.Qe4 c3 12.Qf3+ Kc2 (16.960.012) 904
13/41 0:28 -1.24 1.Nb1+ Kc1 2.Nc3 Qd3 3.Na2+ Kd1
4.Qb5 Qf1+ 5.Kh2 Qxf4+ 6.Kh3 Qd2
7.Kg3 Qd3+ 8.Kg4 b1R 9.Nc3+ Qxc3
10.Qxb1+ Qc1 11.Qe4 c3 12.Qf3+ Ke1
13.Qg3+ Kd2 14.Qf4+ (26.313.870) 912
14/42 0:58 -1.30 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qd2+ 6.Kf3 c2 7.Qc5 b1Q
8.Nxb1 Kxb1 9.Qb5+ Ka2 10.Qc4+ Kb2
11.Qb5+ Ka3 12.Qc5+ Kb3 13.Qb5+ Qb4
14.Qd5+ (53.776.490) 925
15/48 2:13 -1.53 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kh3 Qe3+ 5.Kg4 b1Q 6.Nxb1 Qe4+
7.Kg5 Kxb1 8.Qb4+ Kc2 9.Qa4+ Kd2
10.Qb4+ Kd1 11.Qa4+ Ke2 12.Qa6 Qe3+
13.Kh5 Qe5+ 14.Kg4 (126.744.854) 952
16/48 5:48 -1.56 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 b1Q
8.Nxb1 Kxb1 9.Qb4+ Kc1 10.Qd4 Qe1+
11.Kh3 Kb1 12.Qd3 Qh1+ 13.Kg3 Qg1+
14.Kh4 (345.624.899) 991
17/49 17:44 -1.61 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 b1Q
8.Nxb1 Kxb1 9.Qb4+ Kc1 10.Qd4 Qe1+
11.Kh3 Kb1 12.Qd3 Qb4 13.Kg4 Kb2
14.Qe2 (1.128.785.584) 1060
18/51 39:08 -1.53 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 b1Q
8.Nxb1 Qd3+ 9.Kf2 Kxb1 10.Qb6+ Ka2
11.Qa5+ Kb2 12.Qe5+ Kb1 13.Qb8+ Kc1
14.Qe5 (2.487.046.382) 1059
best move: Nc3-b1 time: 46:49.407 min n/s: 1.046.770 CPU 100.0% n/s(1CPU): 1.046.770 nodes: 2.940.590.000
-
smirobth
- Posts: 2307
- Joined: Wed Mar 08, 2006 8:41 pm
- Location: Brownsville Texas USA
Re: endgame test position
I am pretty sure Black wins no matter what move White plays. Fritz 11 with QP vs QP and some of the other 6 man tablebases gets to a +9 eval after a few minutes.David Dahlem wrote:can Black win from this position?
- Robin Smith
-
Eelco de Groot
- Posts: 4681
- Joined: Sun Mar 12, 2006 2:40 am
- Full name: Eelco de Groot
Re: endgame test position
Sorry for posting a similar analysis but I wanted to show what I get with the compile made by Denis, there is a marked speed-up of almost exactly 30% in the final NPS in this position 
Toga Exchange Bonus was set to 40, without it this version plays 95. Na2+ for a long time Although it probably makes no difference for the endresult, the tuning seemed a bit off with Toga Exchange Bonus at 35.
Also now the score is still decreasing ever so slightly for White at 18 ply deep. A shootout with Toga vs. Toga (my own compile) leads to a win for Black quickly.
[d]8/8/8/Q7/2p2P2/2N5/1pqk4/7K w - -
Engine: Toga II 1.4 Checkov Beta_3DMbb5 (Toga14CheckovBeta_3-1cpu.exe, Compile by Denis Mendoza, Athlon 2009 MHz, 256 MB)
by Thomas Gaksch and Fabien Letouzey
1/09 0:00 -3.26 1.Kg1 Qxc3 (112)
1/12 0:00 -3.14 1.Kg2 Qxc3 (771)
1/13 0:00 +1.04 1.Nb1+ Ke3 (2.011)
1/18 0:00 +1.31 1.Ne4+ Ke3 (13.281)
2/18 0:00 +0.03 1.Ne4+ Ke3 2.Qb6+ Kxf4 3.Qf6+ Ke3 (43.649)
2/18 0:00 +0.95 1.Nb1+ Ke3 2.Qe5+ Kf3 (44.805)
3/23 0:00 -0.27 1.Nb1+ Ke3 2.Qb6+ Kxf4 3.Qf6+ Ke3
4.Qb6+ Kf3 5.Qc6+ Kg4 6.Qe6+ Kh4
7.Qf6+ Kg4 (66.340)
4/23 0:00 -0.29 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qe5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qc5+ Ke4
7.Qc6+ Ke5 8.Qc5+ Kf4 (132.420)
5/23 0:00 -0.28 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qe5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qc5+ Kg6 (155.113)
6/25 0:00 -0.27 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qe5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd4+ Kg6 8.Qd6+ Kh7 9.Qe7+ Kh6
10.Qf6+ Kh5 (211.339)
7/27 0:00 -0.27 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qe5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd6+ Kf7 8.Qd5+ Kg6 9.Qd6+ Kh7
10.Qe7+ Kh6 11.Qf6+ Kh5 (299.775)
8/29 0:00 -0.24 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qc5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd6+ Kf7 8.Qd5+ Kg6 9.Qe6+ Kh7
10.Qd7+ Kh6 11.Qd6+ Kg5 12.Qe5+ Kg6 (506.464)
9/35 0:02 -1.03 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe4+ 6.Kf2 b1Q
7.Qh6+ Kb2 8.Nxb1 Kxb1 9.Qd2 Qf5+
10.Kg2 Qg6+ 11.Kf2 Qf6+ 12.Kg2 (2.453.599) 1190
9/35 0:03 0.00 1.Na2+ Ke2 2.Qh5+ Ke3 3.Qh3+ Kxf4
4.Qh4+ Kf3 5.Qh5+ Ke3 6.Qh6+ Kf3
7.Qh5+ (4.159.414) 1176
10/35 0:04 -1.54 1.Na2+ Ke2 2.Qh5+ Ke1 3.Qh4+ Qf2
4.Qxf2+ Kxf2 5.Nc3 Ke3 6.f5 Kd4
7.Nb1 Ke5 8.Kg1 Kxf5 9.Kf2 (4.918.133) 1185
10/35 0:04 -1.03 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe4+ 6.Kf2 b1Q
7.Qh6+ Kb2 8.Nxb1 Kxb1 9.Qd2 Qf5+
10.Kg2 Qg6+ 11.Kf2 Qf6+ 12.Kg2 (5.441.394) 1185
11/37 0:06 -1.21 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe2+ 6.Kg3 b1Q
7.Nxb1 Kxb1 8.Qb5+ Kc2 9.Qa4+ Kd2
10.Qa2+ Kd3 11.Qb1+ Qc2 12.Qf1+ Kd4
13.Qf6+ Kd5 14.Qg5+ (7.209.198) 1178
12/37 0:13 -1.29 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe2+ 6.Kg3 b1Q
7.Nxb1 Kxb1 8.Qb5+ Kc2 9.Qa4+ Kd3
10.Qd7+ Kc3 11.Qc6 Qe3+ 12.Kg4 Qd4+
13.Kf3 (15.463.040) 1145
13/38 0:20 -1.28 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe2+ 6.Kg3 b1Q
7.Nxb1 Kxb1 8.Qb5+ Kc2 9.Qa4+ Kd3
10.Qd7+ Kc3 11.Qc6 Qe3+ 12.Kg2 Qg5+
13.Kf3 Qf5+ 14.Kg3 (24.249.723) 1168
14/40 0:41 -1.49 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kh3 Qe3+ 5.Kg4 b1Q 6.Nxb1 Qd4+
7.Kg3 Qd3+ 8.Kh4 Kxb1 9.Qe1+ Kc2
10.Qf2+ Kc3 11.Qf7 Qe4+ 12.Kg3 Kb3
13.Kf2 Qc2+ 14.Kg3 (49.221.828) 1186
15/44 1:44 -1.56 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 Kd1
8.Qd4+ Ke1 9.Nxc2+ Qxc2 10.Qg1+ Kd2
11.Qh2+ Kc3 12.Qh8+ Kc4 13.Qc8+ Kd3
14.Qd7+ (128.868.218) 1232
16/48 4:19 -1.62 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 Kd1
8.Qd4+ Ke1 9.Nxc2+ Qxc2 10.Qg1+ Kd2
11.Qh2+ Kc3 12.Qh8+ Kc4 13.Qg8+ Kd4
14.Qg7+ (337.737.681) 1301
17/49 10:48 -1.66 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kf1 Qxf4+ 5.Ke2 Qe4+ 6.Kf2 Qd4+
7.Kg2 Qe3 8.Qa6 Qe2+ 9.Kg3 b1Q
10.Nxb1 Kxb1 11.Qb5+ Kc1 12.Qg5+ Kc2
13.Qc5 Qd3+ 14.Kg4 (871.520.880) 1343
18/52 36:56 -1.68 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kh1 c3 5.Qf5 Qe1+ 6.Kg2 Qe2+ 7.Kg3 c2
8.Qc5 Kd1 9.Qd4+ Ke1 10.Nxc2+ Qxc2
11.Qg1+ Kd2 12.Qh2+ Kc3 13.Qh8+ Kc4
14.Qg8+ (3.007.043.395) 1356
best move: Nc3-b1 time: 46:50.875 min n/s: 1.361.411 CPU 100.0% n/s(1CPU): 1.361.411 nodes: 3.826.480.000
Toga Exchange Bonus was set to 40, without it this version plays 95. Na2+ for a long time Although it probably makes no difference for the endresult, the tuning seemed a bit off with Toga Exchange Bonus at 35.Also now the score is still decreasing ever so slightly for White at 18 ply deep. A shootout with Toga vs. Toga (my own compile) leads to a win for Black quickly.
[d]8/8/8/Q7/2p2P2/2N5/1pqk4/7K w - -
Engine: Toga II 1.4 Checkov Beta_3DMbb5 (Toga14CheckovBeta_3-1cpu.exe, Compile by Denis Mendoza, Athlon 2009 MHz, 256 MB)
by Thomas Gaksch and Fabien Letouzey
1/09 0:00 -3.26 1.Kg1 Qxc3 (112)
1/12 0:00 -3.14 1.Kg2 Qxc3 (771)
1/13 0:00 +1.04 1.Nb1+ Ke3 (2.011)
1/18 0:00 +1.31 1.Ne4+ Ke3 (13.281)
2/18 0:00 +0.03 1.Ne4+ Ke3 2.Qb6+ Kxf4 3.Qf6+ Ke3 (43.649)
2/18 0:00 +0.95 1.Nb1+ Ke3 2.Qe5+ Kf3 (44.805)
3/23 0:00 -0.27 1.Nb1+ Ke3 2.Qb6+ Kxf4 3.Qf6+ Ke3
4.Qb6+ Kf3 5.Qc6+ Kg4 6.Qe6+ Kh4
7.Qf6+ Kg4 (66.340)
4/23 0:00 -0.29 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qe5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qc5+ Ke4
7.Qc6+ Ke5 8.Qc5+ Kf4 (132.420)
5/23 0:00 -0.28 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qe5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qc5+ Kg6 (155.113)
6/25 0:00 -0.27 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qe5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd4+ Kg6 8.Qd6+ Kh7 9.Qe7+ Kh6
10.Qf6+ Kh5 (211.339)
7/27 0:00 -0.27 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qe5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd6+ Kf7 8.Qd5+ Kg6 9.Qd6+ Kh7
10.Qe7+ Kh6 11.Qf6+ Kh5 (299.775)
8/29 0:00 -0.24 1.Nb1+ Ke2 2.Qh5+ Ke3 3.Qc5+ Kf3
4.Qd5+ Kxf4 5.Qd6+ Kf5 6.Qd5+ Kf6
7.Qd6+ Kf7 8.Qd5+ Kg6 9.Qe6+ Kh7
10.Qd7+ Kh6 11.Qd6+ Kg5 12.Qe5+ Kg6 (506.464)
9/35 0:02 -1.03 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe4+ 6.Kf2 b1Q
7.Qh6+ Kb2 8.Nxb1 Kxb1 9.Qd2 Qf5+
10.Kg2 Qg6+ 11.Kf2 Qf6+ 12.Kg2 (2.453.599) 1190
9/35 0:03 0.00 1.Na2+ Ke2 2.Qh5+ Ke3 3.Qh3+ Kxf4
4.Qh4+ Kf3 5.Qh5+ Ke3 6.Qh6+ Kf3
7.Qh5+ (4.159.414) 1176
10/35 0:04 -1.54 1.Na2+ Ke2 2.Qh5+ Ke1 3.Qh4+ Qf2
4.Qxf2+ Kxf2 5.Nc3 Ke3 6.f5 Kd4
7.Nb1 Ke5 8.Kg1 Kxf5 9.Kf2 (4.918.133) 1185
10/35 0:04 -1.03 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe4+ 6.Kf2 b1Q
7.Qh6+ Kb2 8.Nxb1 Kxb1 9.Qd2 Qf5+
10.Kg2 Qg6+ 11.Kf2 Qf6+ 12.Kg2 (5.441.394) 1185
11/37 0:06 -1.21 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe2+ 6.Kg3 b1Q
7.Nxb1 Kxb1 8.Qb5+ Kc2 9.Qa4+ Kd2
10.Qa2+ Kd3 11.Qb1+ Qc2 12.Qf1+ Kd4
13.Qf6+ Kd5 14.Qg5+ (7.209.198) 1178
12/37 0:13 -1.29 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe2+ 6.Kg3 b1Q
7.Nxb1 Kxb1 8.Qb5+ Kc2 9.Qa4+ Kd3
10.Qd7+ Kc3 11.Qc6 Qe3+ 12.Kg4 Qd4+
13.Kf3 (15.463.040) 1145
13/38 0:20 -1.28 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kg2 Qe3 5.Qa6 Qe2+ 6.Kg3 b1Q
7.Nxb1 Kxb1 8.Qb5+ Kc2 9.Qa4+ Kd3
10.Qd7+ Kc3 11.Qc6 Qe3+ 12.Kg2 Qg5+
13.Kf3 Qf5+ 14.Kg3 (24.249.723) 1168
14/40 0:41 -1.49 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kh2 Qxf4+
4.Kh3 Qe3+ 5.Kg4 b1Q 6.Nxb1 Qd4+
7.Kg3 Qd3+ 8.Kh4 Kxb1 9.Qe1+ Kc2
10.Qf2+ Kc3 11.Qf7 Qe4+ 12.Kg3 Kb3
13.Kf2 Qc2+ 14.Kg3 (49.221.828) 1186
15/44 1:44 -1.56 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 Kd1
8.Qd4+ Ke1 9.Nxc2+ Qxc2 10.Qg1+ Kd2
11.Qh2+ Kc3 12.Qh8+ Kc4 13.Qc8+ Kd3
14.Qd7+ (128.868.218) 1232
16/48 4:19 -1.62 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kg2 c3 5.Qf5 Qe2+ 6.Kg3 c2 7.Qc5 Kd1
8.Qd4+ Ke1 9.Nxc2+ Qxc2 10.Qg1+ Kd2
11.Qh2+ Kc3 12.Qh8+ Kc4 13.Qg8+ Kd4
14.Qg7+ (337.737.681) 1301
17/49 10:48 -1.66 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kf1 Qxf4+ 5.Ke2 Qe4+ 6.Kf2 Qd4+
7.Kg2 Qe3 8.Qa6 Qe2+ 9.Kg3 b1Q
10.Nxb1 Kxb1 11.Qb5+ Kc1 12.Qg5+ Kc2
13.Qc5 Qd3+ 14.Kg4 (871.520.880) 1343
18/52 36:56 -1.68 1.Nb1+ Kc1 2.Na3 Qe4+ 3.Kg1 Qe3+
4.Kh1 c3 5.Qf5 Qe1+ 6.Kg2 Qe2+ 7.Kg3 c2
8.Qc5 Kd1 9.Qd4+ Ke1 10.Nxc2+ Qxc2
11.Qg1+ Kd2 12.Qh2+ Kc3 13.Qh8+ Kc4
14.Qg8+ (3.007.043.395) 1356
best move: Nc3-b1 time: 46:50.875 min n/s: 1.361.411 CPU 100.0% n/s(1CPU): 1.361.411 nodes: 3.826.480.000