Mate in 115
Moderators: hgm, Rebel, chrisw
-
- Posts: 115
- Joined: Thu Nov 25, 2010 12:16 pm
Re: Mate in 115
Which is just what you would expect, if that install of CM 10, did not yet include the table base files and have CM set up to use them.
-
- Posts: 6442
- Joined: Tue Jan 09, 2007 12:31 am
- Location: PA USA
- Full name: Louis Zulli
Re: Mate in 115
It seems that you have the 5-piece tablebases but not the 6-piece tablebases.
-
- Posts: 149
- Joined: Thu Feb 15, 2007 4:34 am
- Location: USA
Re: Mate in 115
About Allan's position, I'm getting conflicting numbers. Most of the engines using Nalimov TBs return -M 115. Except that Tornado 4.4 returns -M 116.
And with Gaviota TBs, Umko 1.1 returns -M115, but two versions of Gaviota (including 0.80) return -M 102.
Any ideas for the discrepancies? Problems with how a few engines use the TBs? And maybe someone could confirm my results? (All engines were 32-bit in Arena 2.0.1.)
And with Gaviota TBs, Umko 1.1 returns -M115, but two versions of Gaviota (including 0.80) return -M 102.
Any ideas for the discrepancies? Problems with how a few engines use the TBs? And maybe someone could confirm my results? (All engines were 32-bit in Arena 2.0.1.)
-
- Posts: 1471
- Joined: Tue Mar 16, 2010 12:00 am
Re: Mate in 115
Houdini 1.5 with Gaviota TB says it's mate in 115.
-
- Posts: 2041
- Joined: Wed Mar 08, 2006 8:30 pm
Re: Mate in 115
This shortest mate in 115 is indeed legal (White pushes his Pawn after less than 50 moves)zullil wrote: According to the tablebases, the position is indeed Mate-in-115.
It would be interesting to search, starting from this given position, if White can hold his Pawn still during 50 moves, allowing a non-optimal (shorter) Mate, but in fact obtaining a legal Draw.
-
- Posts: 6401
- Joined: Thu Mar 09, 2006 8:30 pm
- Location: Chicago, Illinois, USA
Re: Mate in 115
The problem is that I messed up the output of the engine in analyze mode when I was trying to limit it to avoid lag in Arena... arrrrrrrrgggggggggghhhhh. Thanks for reporting it. I need to fix this because it is embarrasing.Jimbo I wrote:About Allan's position, I'm getting conflicting numbers. Most of the engines using Nalimov TBs return -M 115. Except that Tornado 4.4 returns -M 116.
And with Gaviota TBs, Umko 1.1 returns -M115, but two versions of Gaviota (including 0.80) return -M 102.
Any ideas for the discrepancies? Problems with how a few engines use the TBs? And maybe someone could confirm my results? (All engines were 32-bit in Arena 2.0.1.)
The probing and the TBs are fine (console command tb) =
Code: Select all
+-----------------+
| . . . . . . . . | [Black]
| k . . . . . . . |
| . . . . . . . . |
| . . . . K n . . | Castling:
| . . . . . . . . | ep: -
| P . . . . . . . |
| . . . . . . . . |
| . n . . . . . . |
+-----------------+
tb
Black wins in 115 moves
----------------------------------
Ne7 wins in 115 (229 plies)
Nc3 DRAW
Nd2 DRAW
Nd4 DRAW
Ne3 DRAW
Nd6 DRAW
Nxa3 DRAW
Ng3 DRAW
Ng7 DRAW
Nh4 DRAW
Nh6 DRAW
Kb6 DRAW
Kb7 DRAW
Ka6 DRAW
Kb8 DRAW
Ka8 DRAW
-
- Posts: 6401
- Joined: Thu Mar 09, 2006 8:30 pm
- Location: Chicago, Illinois, USA
Re: Mate in 115
I fixed the problem here and it was a very silly bug. Historically, Gaviota understood mate scores until 200 plies. That was plenty because the maximum ply search was 64. Of course, until I introduce the TBs... So, it could never report mates longer than a 100 + number of plies from the root. I needed to change one number.michiguel wrote:The problem is that I messed up the output of the engine in analyze mode when I was trying to limit it to avoid lag in Arena... arrrrrrrrgggggggggghhhhh. Thanks for reporting it. I need to fix this because it is embarrasing.Jimbo I wrote:About Allan's position, I'm getting conflicting numbers. Most of the engines using Nalimov TBs return -M 115. Except that Tornado 4.4 returns -M 116.
And with Gaviota TBs, Umko 1.1 returns -M115, but two versions of Gaviota (including 0.80) return -M 102.
Any ideas for the discrepancies? Problems with how a few engines use the TBs? And maybe someone could confirm my results? (All engines were 32-bit in Arena 2.0.1.)
Miguel
The probing and the TBs are fine (console command tb) =
MiguelCode: Select all
+-----------------+ | . . . . . . . . | [Black] | k . . . . . . . | | . . . . . . . . | | . . . . K n . . | Castling: | . . . . . . . . | ep: - | P . . . . . . . | | . . . . . . . . | | . n . . . . . . | +-----------------+ tb Black wins in 115 moves ---------------------------------- Ne7 wins in 115 (229 plies) Nc3 DRAW Nd2 DRAW Nd4 DRAW Ne3 DRAW Nd6 DRAW Nxa3 DRAW Ng3 DRAW Ng7 DRAW Nh4 DRAW Nh6 DRAW Kb6 DRAW Kb7 DRAW Ka6 DRAW Kb8 DRAW Ka8 DRAW
-
- Posts: 2041
- Joined: Wed Mar 08, 2006 8:30 pm
Re: Mate in 115
Are you sure?rabbits wrote:Found the position on the web page below.
http://en.wikipedia.org/wiki/Two_knights_endgame.
I find no such diagram in that link.
-
- Posts: 276
- Joined: Wed Mar 08, 2006 10:14 pm
- Location: Sydney, Australia
Re: Mate in 115
Ernest: I could not find it either when I clicked on to the link I had pasted there-which is wierd- yet when I typed in, Chess two knights versus pawn checkmate, into "Google" the same article for Wikipedia came up on the screen with the position on it. Try that method and see if you have any success. The article is to do with the pawn being beyond the Troitsky line
Allan
I've pasted the address again.
http://en.wikipedia.org/wiki/Two_knights_endgame
Allan
I've pasted the address again.
http://en.wikipedia.org/wiki/Two_knights_endgame
-
- Posts: 2041
- Joined: Wed Mar 08, 2006 8:30 pm
Re: Mate in 115
Thanks: this link works!rabbits wrote:http://en.wikipedia.org/wiki/Two_knights_endgame
Found the problem: the dot at the end of the previous http://en.wikipedia.org/wiki/Two_knights_endgame.