Announce the mate!

[metax]

This is mainly for authors of weaker engines because it's very easy for the stronger ones - how much time does your engine take to announce the forced mate?

[d]3bk1n1/2n5/3q4/8/1p3p1p/pPp1pPpP/P1P1P1P1/N1K2QNB w - -


I begin with the Rybka 2.2n2 and ChessMind analysis.



Engine: Rybka 2.2n2 (128 MB)
von Vasik Rajlich

23.01 0:01 -M18 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Se2 Sxe2 10.Dg1 Sc1 11.Df1 e2
12.De1 Sxb3 13.axb3 Dxe1+ (36.419) 24

24.01 0:01 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Se2 Sxe2 10.Dg1 Sc1 11.Df1 e2
12.De1 Scd3 13.Dxd2 cxd2 (42.390) 25

25.01 0:01 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Se2 Sxe2 10.Dg1 Sc1 11.Df1 e2
12.De1 Scd3 13.Dxd2 cxd2 (51.442) 27

26.01 0:02 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Se2 Sxe2 10.Dg1 Sc1 11.Df1 e2
12.De1 Scd3 13.Dxd2 cxd2 (67.458) 29

27.01 0:02 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Dc1 e2 10.Sxe2 Sxe2 11.Dg1 Sd3
12.Df1 Kf7 13.Dg1 Sxg1 14.cxd3 (91.556) 32

28.01 0:03 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Dc1 e2 10.Sxe2 Sxe2 11.Dg1 Sd3
12.Df1 Kf7 13.Dg1 Sxg1 14.cxd3 (126.251) 35

29.01 0:04 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Dc1 e2 10.Sxe2 Sxe2 11.Dg1 Sd3
12.Df1 Kf7 13.Dg1 Sxg1 14.cxd3 (177.422) 37

30.01 0:06 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Dc1 e2 10.Sxe2 Sxe2 11.Dg1 Sd3
12.Df1 Kf7 13.Dg1 Sxg1 14.cxd3 (260.984) 39

31.01 0:09 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Dc1 e2 10.Sxe2 Sxe2 11.Dg1 Sd3
12.Df1 Kf7 13.Dg1 Sxg1 14.cxd3 (391.298) 41

32.01 0:14 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Dc1 e2 10.Sxe2 Sxe2 11.Dg1 Sd3
12.Df1 Kf7 13.Dg1 Sxg1 14.cxd3 (608.975) 44

33.01 0:20 -M14 1.Kb1 Sf6 2.De1 Sb5 3.Dc1 Sd7 4.De1 Dd2
5.Dc1 Sd4 6.Df1 Se5 7.Dc1 Sxe2 8.Df1 Sd4
9.Dc1 e2 10.Sxe2 Sxe2 11.Dg1 Sd3
12.Df1 Kf7 13.Dg1 Sxg1 14.cxd3 (917.582) 46

Bester Zug: Kc1-b1 Zeit: 0:21.949 min K/s: 993.151 Knoten: 993.151



Engine: ChessMind 0.72 (0 MB)
von metax

19.00 0:00 -2.50 1.Kb1 Dd2 2.Dc1 Dxc1+ 3.Kxc1 Se6
4.Kd1 Sf6 5.Ke1 Sd5 6.Kd1 Kf7 7.Ke1 Kf6
8.Kd1 Ke5 9.Ke1 Sd4 10.Kd1 Le7
11.Ke1 (90.763) 177

20.00 0:14 -M13 1.Kb1 Dd2 2.Dc1 Se6 3.Df1 Kf8 4.Dc1 Sf6
5.Df1 Sd4 6.Dc1 Sxe2 7.Df1 Sxg1
8.Dxg1 Se4 9.fxe4 e2 10.Dc5+ Kg8
11.Dc4+ Kh8 12.Dxe2 Dxe2 13.Kc1 (3.324.006) 225

Bester Zug: Kc1-b1 Zeit: 0:17.691 min K/s: 224.000 Knoten: 3.780.110


Well, Rybka finds a mate in 14, but ChessMind finds a mate in 13. Stockfish only finds a fail-low (88.XY) score after 3 minutes on my machine. Now I'm confused.

(At the end of ChessMind's PV, 13...Qe1# mates of course.)

[David Dahlem]

Bright 0.5c announces mate in 11 in 11 seconds:

27/42 00:06 21.245.394 3.468.635 -M13 Kc1b1 Qd6d2 Qf1c1 Nc7b5 Qc1f1 Nb5d4 Qf1c1 Nd4xe2 Qc1f1 Ne2d4 Qf1c1 Ng8h6 Qc1f1 e3e2 Ng1xe2 Nd4xe2 Qf1g1 Nh6f5 Qg1f1 Nf5e3 Qf1g1 Ne3d1 Qg1e3+ f4xe3 f3f4 Qd2c1+
28/42 00:11 40.583.421 3.710.653 -M11 Kc1b1 Qd6d2 Qf1c1 Nc7b5 Qc1f1 Nb5d4 Qf1c1 Ng8f6 Qc1f1 Nf6d7 Qf1c1 Nd4xe2 Qc1xd2 c3xd2 Ng1xe2 d2d1Q+ Ne2c1 e3e2 c2c3 e2e1Q c3xb4 Qd1xc1+
29/42 00:14 57.164.105 3.925.566 -M11 Kc1b1 Qd6d2 Qf1c1 Nc7b5 Qc1f1 Nb5d4 Qf1c1 Ng8f6 Qc1f1 Nf6d7 Qf1c1 Nd4xe2 Qc1xd2 c3xd2 Ng1xe2 d2d1Q+ Ne2c1 e3e2 c2c3 e2e1Q c3xb4 Qd1xc1+
30/42 00:21 87.176.727 4.185.554 -M11 Kc1b1 Qd6d2 Qf1c1 Nc7b5 Qc1f1 Nb5d4 Qf1c1 Ng8f6 Qc1f1 Nf6d7 Qf1c1 Nd4xe2 Qc1xd2 c3xd2 Ng1xe2 d2d1Q+ Ne2c1 e3e2 c2c3 e2e1Q c3xb4 Qd1xc1+
31/45 00:29 127.639.271 4.391.964 -M11 Kc1b1 Qd6d2 Qf1c1 Nc7b5 Qc1f1 Nb5d4 Qf1c1 Ng8f6 Qc1f1 Nf6d7 Qf1c1 Nd4xe2 Qc1xd2 c3xd2 Ng1xe2 d2d1Q+ Ne2c1 e3e2 c2c3 e2e1Q c3xb4 Qd1xc1+

[metax]

OK, Rybka finds mate in 14, ChessMind mate in 13, and it's at least mate in 11. Very good test position, I have to admit.

[Jim Walker]

After the Queen moves to d2, many moves lead to mate in 10 so it's a mate in 11. I wonder why many programs ignore Qd2.
Jim