#Mat in 14

[gleperlier]

[d]8/3R1R2/6p1/6kr/1P2B3/p3P1p1/PbN1q3/1K6 b - - 0 51



Rh4

Cheers,

Gab

[zullil]

[d]8/3R1R2/6p1/6kr/1P2B3/p3P1p1/PbN1q3/1K6 b - - 0 51



Rh4

Cheers,

Gab

Critter-1.6a (8 threads, 4 GB Hash and searchmoves h5h4) sees mate in ≤ 15, but not mate in ≤ 14.

Code: Select all

23/54  10:12    8221M  13415K   +M15 Rh4 Rf4 Rxf4 exf4+ Kxf4 Ba8 Qf1+ Ne1 Qxe1+ Kc2 Qxb4 Rd8 Qa4+ Kd3 Qb5+ Kd2 Qa5+ Kc2 Qxd8 Bg2 Qa5 Kb3 Qb5+ Kc2 Ke3 Bf1 Qa4+ Kb1 Qd1#

With a normal search, Critter finds mate in ≤ 15 starting with g2:

Code: Select all

30/64  10:23    8429M  13524K   +M15 g2 Bxg2 Qxg2 Rd1 Rh2 Rc7 Qe2 Rc5+ Kh6 Rg1 Qd3 Re1 Rd2 Rh1+ Kg7 Rc7+ Kf6 Rc6+ Ke5 Rc5+ Kd6 Rc6+ Kxc6 b5+ Kd6 Rc1 Rd1 Rxd1 Qxd1#

Anyone confirm mate in ≤ 14?

[zullil]

[d]8/3R1R2/6p1/6kr/1P2B3/p3P1p1/PbN1q3/1K6 b - - 0 51



Rh4

Cheers,

Gab

OK, I don't believe you!:D Several initial moves, including Rh4, lead to mate in ≤ 15. Please provide a mate in ≤ 14.

[bnst]

According to Chest it is NOT a mate in 12. My estimate is that to check mate in 13 will take more than a day and mate in 14 will take nearly two weeks so I don't bother.

I have made an updated version of Chest 3.19 which I have called 3.19b with all the fixes on Heiner Maxen's homepage and compiled it for 32 and 64-bit execution, so if anybody is interested tell me.

Regards
Andreas

[A Distel]

According to Chest it is NOT a mate in 12. My estimate is that to check mate in 13 will take more than a day and mate in 14 will take nearly two weeks so I don't bother.

I have made an updated version of Chest 3.19 which I have called 3.19b with all the fixes on Heiner Maxen's homepage and compiled it for 32 and 64-bit execution, so if anybody is interested tell me.

Regards
Andreas

Andreas Stabel,

I'm interested!

Thank You.

Regards,

A Distel.

[gleperlier]

Analysis by Deep Junior 13.3:

51...Rh5-h4 52.Rf7-f4 Rh4xf4 53.e3xf4+ Kg5xf4 54.Be4-b7 Qe2-f1+ 55.Nc2-e1 Qf1xe1+ 56.Kb1-c2 Qe1xb4 57.Rd7-d8 Qb4xb7
-+ (-#14) Depth: 25 00:04:20 1914mN, tb=1437

[zullil]

Analysis by Deep Junior 13.3:

51...Rh5-h4 52.Rf7-f4 Rh4xf4 53.e3xf4+ Kg5xf4 54.Be4-b7 Qe2-f1+ 55.Nc2-e1 Qf1xe1+ 56.Kb1-c2 Qe1xb4 57.Rd7-d8 Qb4xb7
-+ (-#14) Depth: 25 00:04:20 1914mN, tb=1437

Critter thinks that 54. Be4-b7 is weaker than 54. Be4-a8. The latter move avoids mate for one more move. So it seems that Deep Junior's evaluation is wrong.

[Michael Diosi]

Hi,


yes me...

Michael
http://www.playwitharena.com

[Ignacio]

I have made an updated version of Chest 3.19 which I have called 3.19b with all the fixes on Heiner Maxen's homepage and compiled it for 32 and 64-bit execution, so if anybody is interested tell me.

Regards
Andreas

I'm interested!

Thank You.

Regards,

Ignacio Santos

[F.Huber]

I'm interested!

But be aware that this is not the WinChest version (with all the additional features and special parameters), so you can't use this new(?) Chest in ChestUCI.

Regards,
Franz