Arasan13 test results

[zullil]

Here's Critter 1.2.1 with 8 threads, 2GB hash and 5 minutes for the position

Er... Louis, thanks... but that's not what I call a winning move!

or have I missed something?...

Perhaps the best move is not a winning move? I need to actually look at the position!

[d] 4B3/8/5Kp1/p5p1/1k3pP1/2n2P1P/8/8 b - -

[ernest]

Perhaps the best move is not a winning move?

Well then, that position has no interest at all...
Any progam will find ...Nb5 and ...Ne4+, with eval 0.00

[kgburcham]

Perhaps the best move is not a winning move?

Well then, that position has no interest at all...
Any progam will find ...Nb5 and ...Ne4+, with eval 0.00

Hello Ernest.
We must go back in time to appreciate some test positions.
You are correct, for modern hardware with a modern program, some moves are too easy.
kgburcham

[d] 4B3/8/5Kp1/p5p1/1k3pP1/2n2P1P/8/8 b - - 0 1

Comet B68:

1...a4 2.Bxg6 Ne4+ 3.Bxe4 a3 4.Kxg5 a2 5.Kxf4 a1Q
-/+ (-0.74) Depth: 5/11 00:00:00
1...a4 2.Bxg6 Ne4+ 3.Bxe4 a3 4.Kxg5 a2 5.Kxf4 a1Q
-/+ (-0.74) Depth: 5/11 00:00:00
1...a4 2.Bxa4 Kc4 3.Kxg6 Ne4
+/= (0.41) Depth: 5/11 00:00:00
1...a4 2.Bxa4 Kc4 3.Kxg6 Ne4
+/= (0.41) Depth: 5/11 00:00:00
1...Ne4+ 2.Kxg6 Nf2 3.Kxg5 Nxh3+ 4.Kf5 Kb3
= (0.18) Depth: 5/11 00:00:00 11kN
1...Ne2 2.Kxg6 Ng1 3.Kxg5 Nxh3+ 4.Kf5 Ng1
= (0.18) Depth: 6/11 00:00:00 12kN
1...Ne2 2.Kxg6 Ng1 3.Kxg5 Nxh3+ 4.Kf5 Ng1
= (0.18) Depth: 6/11 00:00:00 14kN
1...Ne2 2.Kxg6 Ng1 3.Kxg5 Nxh3+ 4.Kf5 Ng1
= (0.18) Depth: 6/11 00:00:00 14kN
1...Ne2 2.Kxg6 Ng1 3.Kxg5 Nxh3+ 4.Kf5 Ng1
= (0.18) Depth: 6/11 00:00:00 14kN
1...Ne2 2.Kxg6 Ng1 3.Kxg5 Nxh3+ 4.Kf5 Ng1
= (0.18) Depth: 6/11 00:00:00 14kN
1...Ne4+ 2.Kxg6 a4 3.fxe4 a3 4.Kxg5 f3 5.Bc6 f2 6.Kf4
-/+ (-0.72) Depth: 6/14 00:00:00 28kN
1...Ne4+ 2.Ke5 Nf2 3.Kd5 Nxh3
-+ (-1.87) Depth: 6/14 00:00:00 46kN
1...Ne4+ 2.Kg7 Nd2 3.Bc6 Kc5 4.Bb7 a4
-+ (-1.89) Depth: 6/15 00:00:00 63kN
1...Ne4+ 2.Kxg6 a4 3.Bf7 Kc5 4.h4 Nd6 5.hxg5 Nxf7 6.Kxf7
-+ (-1.43) Depth: 7/15 00:00:00 106kN
1...Ne4+ 2.Kxg6 Nc5 3.Kxg5 Ne6+ 4.Kg6 Nd4 5.Kf6 Nxf3
=/+ (-0.28) Depth: 7/16 00:00:00 139kN
1...Ne4+ 2.Kxg6 a4 3.Bf7 Kc5 4.Be8 a3 5.fxe4 a2 6.Kxg5
= (-0.08) Depth: 7/16 00:00:00 189kN
1...Ne4+ 2.Kxg6 a4 3.Bxa4 Kxa4 4.Kf7 Nf2 5.Kg7 Nxg4 6.hxg4
=/+ (-0.53) Depth: 8/16 00:00:00 284kN
1...Ne4+ 2.Kxg6 a4 3.Bf7 Nd6 4.Be6 Nc4 5.Bxc4 Kxc4 6.Kxg5 Kd4
=/+ (-0.53) Depth: 8/16 00:00:00 332kN
1...Ne4+ 2.Kxg6 a4 3.Bd7 a3 4.Be6 Nf2
= (-0.16) Depth: 9/18 00:00:00 863kN
1...a4 2.Kxg6 a3 3.Bf7 Kc5 4.Bb3 Kd4 5.Kxg5 Ke3 6.h4 Kxf3
=/+ (-0.40) Depth: 9/18 00:00:00 1080kN
1...a4 2.Bxa4 Ne4+ 3.Ke5 Nf2 4.Bc2 Nxh3 5.Bxg6 Kc5 6.Bf7 Nf2
= (-0.17) Depth: 10/21 00:00:00 1316kN
1...Ne4+ 2.Kxg6 a4 3.Bf7 a3 4.Ba2 Kb5 5.fxe4 f3 6.Bb1 a2 7.Bxa2 f2 8.Kxg5 f1Q
=/+ (-0.54) Depth: 10/21 00:00:01 2156kN
1...Ne4+ 2.Kxg6 a4 3.Bf7 a3 4.Ba2 Kc3 5.Kf5 Nf2 6.Kxg5 Nxh3+
=/+ (-0.42) Depth: 11/21 00:00:02 4047kN
1...Ne4+ 2.Kxg6 a4 3.Bxa4 Kc4 4.fxe4 Kc3 5.Kxg5 f3 6.h4 f2 7.Bd7 Kd2 8.Bf5 f1Q
= (0.03) Depth: 12/23 00:00:03 6449kN
1...Ne4+ 2.Kxg6 a4 3.Bxa4 Kxa4 4.Kf5 Nf2 5.Kxg5 Nxh3+ 6.Kf5 Kb5 7.g5 Kc5 8.g6
+/= (0.46) Depth: 12/23 00:00:06 12177kN
1...Ne4+ 2.Kxg6 Kc5 3.Kh6 Nd6 4.Ba4 Ne4 5.Bc2 Nf2 6.Kxg5 Nxh3+
+/- (0.79) Depth: 13/25 00:00:10 20448kN
1...Ne4+ 2.Kxg6 Kc5 3.Kh6 Kd6 4.Bb5 Nc3 5.Bd3 Ke5 6.Kxg5 Nd1 7.Bf5 Nf2 8.Kh4
+/= (0.49) Depth: 14/29 00:00:27 54343kN
1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd6 4.Bc2 Nd2 5.Kxg5 Ke5 6.Bd1 a4
+/- (0.88) Depth: 15/29 00:01:01 123mN
1...Nb5 2.Kxg6 a4 3.Kxg5 a3 4.Bf7 Nd4
+/- (0.73) Depth: 15/29 00:01:29 180mN1...Nb5 2.Kxg6 a4 3.Kxg5 a3 4.Bf7 Nd4 5.Ba2 Kc3 6.h4 Nxf3+ 7.Kxf4 Nxh4 8.Bb1 Ng6+ 9.Ke3 Ne7 10.g5
+/= (0.29) Depth: 16/29 00:01:47 216mN
1...Nb5 2.Kxg5 a4 3.h4 a3 4.Bf7 Nd4
=/+ (-0.31) Depth: 16/31 00:01:59 238mN
1...Nb5 2.Kxg5 a4 3.h4 a3 4.Bf7 Nd4 5.Ba2 Nxf3+ 6.Kxf4 Nxh4 7.Kg5 Nf3+ 8.Kxg6 Kc3 9.Kf5 Kb2 10.Bd5 Nd2
= (-0.19) Depth: 17/31 00:03:30 412mN

[zullil]

Perhaps the best move is not a winning move?

Well then, that position has no interest at all...
Any progam will find ...Nb5 and ...Ne4+, with eval 0.00

Well, if there are really two "best moves" then this problem is bad. Can Black do better than draw this one?

[Eelco de Groot]

Perhaps the best move is not a winning move?

Well then, that position has no interest at all...
Any progam will find ...Nb5 and ...Ne4+, with eval 0.00

Well, if there are really two "best moves" then this problem is bad. Can Black do better than draw this one?

Rainbow Serpent would choose Ne4+, only once there is a Fail High for the bm, but it is not resolved as better than Ne4+ so the move is abandoned again.


4B3/8/5Kp1/p5p1/1k3pP1/2n2P1P/8/8 b - -


r2q1rk1/p4p2/bp1pp3/n1p3pn/2PPP3/P1PB2B1/4N1PP/R2Q1RK1 w - -

Engine: eXperimental Tommy Cooper - Rainbow Serpent Build 251 (Athlon 2009 MHz, 256 MB) With latest changes:

• More superlinear extensions of the next best move in case the singular extended move fails.
• GrainSize reduced to 2.
• ThreatBonus[sente][attacking][attacked] edited for Queen attacked gote.
• Experimental XrayThreatBonus and XrayPinThreatBonus.
• Exclusion search tried in root_search().

By Tord Romstad, Marco Costalba, Joona Kiiski

1/01 0:00 +0.64 1...Nd5+ (154) 0

2/04 0:00 +0.20 1...Nd5+ 2.Kxg5 a4 3.Bf7 (872) 3

2/03 0:00 +0.97 1...a4 2.Ke5 a3 (1.005) 4

3/06 0:00 +0.86 1...a4 2.Bxa4 Nxa4 3.Kxg6 Nc3 4.Kxg5 (15.321) 57

4/06 0:00 +0.79 1...a4 2.Bxa4 Kxa4 3.Kxg5 Nd5 4.Kxg6 (34.765) 123

5/06 0:00 +0.97 1...a4 2.Bxa4 Kxa4 3.Kxg5 Kb4 4.Kxg6 (39.976) 134

6/06 0:00 +0.71-- 1...a4 2.Bxa4 Kxa4 3.Kxg5 Kb4 4.Kxg6 (68.264) 208

6/06 0:00 +0.44-- 1...a4 2.Bxa4 Kxa4 3.Kxg5 Kb4 4.Kxg6 (82.165) 238

6/14 0:00 +0.48 1...a4 2.Bxa4 Kxa4 3.Kxg5 Nd5 4.Kxg6 Ne3
5.h4 Nxg4 6.h5 Ne5+ 7.Kg5 Nxf3+
8.Kxf4 (92.106) 256

7/06 0:00 +0.12 1...a4 2.Bxa4 Nxa4 3.Kxg6 Nc3 4.Kxg5 (112.649) 300

8/10 0:00 -0.09 1...a4 2.Bxa4 Kxa4 3.Kxg5 Ne2 4.Kxg6 Ng1
5.Kf5 Nxh3 6.g5 (206.736) 427

9/10 0:00 -0.62-- 1...a4 2.Bxa4 Kxa4 3.Kxg5 Ne2 4.Kxg6 Ng1
5.Kf5 Nxh3 6.g5 (323.182) 517

9/03 0:00 +0.44++ 1...Ne4+ 2.fxe4 f3 (359.960) 535

9/09 0:00 +0.94 1...Ne4+ 2.Kxg6 a4 3.Bf7 a3 4.fxe4 f3
5.Kxg5 f2 (378.569) 538

10/14 0:00 -0.30-- 1...Ne4+ 2.Kxg6 a4 3.Bxa4 Kxa4 4.Kf5 Nf2
5.Kxg5 Nxh3+ 6.Kf5 Kb4 7.g5 Kc4 8.g6 (463.304) 559

10/14 0:00 -0.31 1...Ne4+ 2.Kxg6 a4 3.Bxa4 Kxa4 4.Kf5 Nf2
5.Kxg5 Nxh3+ 6.Kf5 Kb4 7.g5 Kc4 8.g6 (545.631) 581

11/16 0:01 -0.32 1...Ne4+ 2.Kxg6 a4 3.Bxa4 Kxa4 4.Kf5 Nf2
5.Kxg5 Nxh3+ 6.Kf5 Kb4 7.g5 Kc5 8.g6 Kd6
9.g7 (666.919) 609

12/14 0:01 -1.09 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Nc3 4.Bc2 a4
5.Bxa4 Nxa4 6.Kxg5 Nb2 7.Kxf4 Nd3+
8.Kf5 (1.126.987) 655

13/33 0:06 -0.32 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.h4 Nxf3+ 7.Bxf3 Kxf3
8.h5 Ke4 9.h6 f3 10.h7 f2 11.h8Q f1Q
12.Qa8+ Ke3 13.Qa7+ Ke4 14.Qb7+ Ke5 (4.593.593) 725

14/33 0:06 -0.32 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.h4 Nxf3+ 7.Bxf3 Kxf3
8.h5 Ke4 9.h6 f3 10.h7 f2 11.h8Q f1Q
12.Qa8+ Ke3 13.Qa7+ Ke4 14.Qb7+ Ke5 (4.614.091) 725

15/33 0:06 -0.32 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.h4 Nxf3+ 7.Bxf3 Kxf3
8.h5 Ke4 9.h6 f3 10.h7 f2 11.h8Q f1Q
12.Qa8+ Ke3 13.Qa7+ Ke4 14.Qb7+ Ke5 (4.643.515) 724

16/33 0:06 -0.32 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.h4 Nxf3+ 7.Bxf3 Kxf3
8.h5 Ke4 9.h6 f3 10.h7 f2 11.h8Q f1Q
12.Qa8+ Ke3 13.Qa7+ Ke4 14.Qb7+ Ke5 (4.684.802) 724

17/17 0:06 -0.20++ 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.fxe4 f3
5.Kf5 f2 6.Bb5 a4 7.e5 Kc5 8.Bd3 a3
9.e6 Kd6 (5.030.959) 725

17/17 0:07 -0.08++ 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.fxe4 f3
5.Kf5 f2 6.Bb5 a4 7.e5 Kc5 8.Bd3 a3
9.e6 Kd6 (5.269.465) 725

17/31 0:40 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 Ke3 9.g6 f3 10.g7 f2 11.g8Q f1Q
12.Qe6+ Kd4 13.Qb6+ Ke4 14.Qc6+ Ke5 (31.116.239) 768

18/31 0:40 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 Ke3 9.g6 f3 10.g7 f2 11.g8Q f1Q
12.Qe6+ Kd4 13.Qb6+ Ke4 14.Qc6+ Ke5 (31.478.782) 768

19/31 0:41 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 Ke3 9.g6 f3 10.g7 f2 11.g8Q f1Q
12.Qe6+ Kd4 13.Qb6+ Ke4 14.Qc6+ Ke5 (31.848.383) 768

20/31 0:42 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 Ke3 9.g6 f3 10.g7 f2 11.g8Q f1Q
12.Qe6+ Kd4 13.Qb6+ Ke4 14.Qc6+ Ke5 (32.507.406) 768

21/37 0:46 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 Ke3 9.g6 f3 10.g7 f2 11.g8Q f1Q
12.Qe6+ Kd4 13.Qb6+ Ke4 14.Qc6+ Kf5 (36.301.503) 777

22/37 0:51 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 Ke3 9.g6 f3 10.g7 f2 11.g8Q f1Q
12.Qe6+ Kd4 13.Qb6+ Ke4 14.Qc6+ Kf5 (40.424.593) 783

23/43 1:00 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 Ke3 9.g6 f3 10.g7 f2 11.g8Q f1Q
12.Qe6+ Kd4 13.Qb6+ Ke4 14.Qc6+ Kf5 (47.876.763) 796

24/27 1:06 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 Ke3 9.g6 f3 10.g7 f2 11.g8Q f1Q
12.Qe6+ Kd4 13.Qb6+ Ke4 14.Qe6+ Kd4 (53.002.828) 803

25/27 1:42 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 Ke3 9.g6 f3 10.g7 f2 11.g8Q f1Q
12.Qe6+ Kd4 13.Qb6+ Ke4 14.Qe6+ Kd4 (79.578.140) 774

26/13 1:53 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3 (87.785.909) 775

27/13 2:12 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3 (103.481.149) 780

28/12 3:07 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 (144.447.314) 769

29/25 4:23 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 Kxf3
8.g5 a4 9.g6 a3 10.g7 a2 11.g8Q a1Q
12.Qb3+ Kg2 13.Qc2+ Kf3 (205.632.142) 780

29/07 5:06 +0.16++ 1...Nb5 2.Bxg6 a4 3.Kxg5 a3 4.Kxf4 a2 (237.984.764) 775

29/12 11:46 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd4 4.Bc6 Nd2
5.Kxg5 Ke3 6.Kh4 Nxf3+ 7.Bxf3 (544.581.722) 770

30/29 23:47 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd6 4.Bc2 Nd2
5.Kxg5 Ke5 6.Kh6 Nxf3 7.g5 Nd4 8.g6 f3
9.g7 f2 10.g8Q f1Q 11.Qe8+ Ne6
12.Qb8+ Kf6 13.Qb2+ Ke7 14.Qa3+ Kf7 (1.067.803.557) 748

31/29 24:08 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd6 4.Bc2 Nd2
5.Kxg5 Ke5 6.Kh6 Nxf3 7.g5 Nd4 8.g6 f3
9.g7 f2 10.g8Q f1Q 11.Qe8+ Ne6
12.Qb8+ Kf6 13.Qb2+ Ke7 14.Qa3+ Kf7 (1.085.018.062) 749

32/29 28:17 0.00 1...Ne4+ 2.Kxg6 Kc5 3.Ba4 Kd6 4.Bc2 Nd2
5.Kxg5 Ke5 6.Kh6 Nxf3 7.g5 Nd4 8.g6 f3
9.g7 f2 10.g8Q f1Q 11.Qe8+ Ne6
12.Qb8+ Kf6 13.Qb2+ Ke7 14.Qa3+ Kf7 (1.267.687.036) 746

best move: Nc3-e4 time: 29:27.781 min n/s: 744.973 nodes: 1.316.950.049

Eelco

[jdart]

Ne4+ and Nb5 and both valid solutions.

Arasan 13.0, Q9550, 4 threads, 1hr/move:

Using book file book.bin
found 5-man tablebases in directory c:\chess\tb
bm Nb5
result: Nb5 score: +0.00 ++ solved in 5.74 sec. (7.82M nodes)
Nb5 Kxg5 a4 h4 a3 Bf7 Nd4 Ba2 Nxf3+ Kxf4 Nxh4 Kg5 Nf3+ Kxg6 Kc3 g5 Kb2 Bd5 Nd4 K
f7 a2 Bxa2
result(2): Ne4+ score: +0.00 ** not solved in 3600.04 secs. (
12993.43M nodes)
Ne4+ Kxg6 Kc5 Ba4 Kd6 Bc2 Nd2 Kxg5 Ke5 Kh5 Nxf3 g5 Nxg5 Kxg5 f3 h4 f2 Bd3 Ke6 Kg
4 f1=Q Bxf1
result(3): a4 score: -2.04 ** not solved in 3600.08 secs. (
17812.92M nodes)
a4 Bxa4 Ne4+ Kxg6 Kxa4 Kf5 Nd2 Kxg5 Kb5 Kxf4 Kc6 h4 Kd6 h5 Ke6 Ke3 Nc4+ Ke4 Nd2+
Kf4 Kf7 Ke3 Nc4+ Kd4 Nd6 Kd5 Ne8 Ke4 Nd6+ Ke5 Nc4+ Kd5 Ne3+ Kd4 Ng2 Ke5 Kg7 f4
Kh6 f5 Ne3