Octochess r4690 released

[Codesquid]

A new version of Octochess has been released.

The changes:

• Fix evaluation bug and use new eval values
• Fix bug in static exchange evaluation leading to assumed king exchange
• UCI: Fix black increment not being considered in time calculation
• UCI: Handle movestogo argument to the go command
• Fix crash in endgame evaluation
• Fix bug in hash table replacement strategy due to truncation at high search depths
• Use history based move ordering of noncaptures in search
• CECP: Tell user an error if trying to use a POPCNT enabled Octochess on a CPU not supporting that instruction

You can download the new version from http://octochess.org/

[Graham Banks]

A new version of Octochess has been released.

The changes:

• Fix evaluation bug and use new eval values
• Fix bug in static exchange evaluation leading to assumed king exchange
• UCI: Fix black increment not being considered in time calculation
• UCI: Handle movestogo argument to the go command
• Fix crash in endgame evaluation
• Fix bug in hash table replacement strategy due to truncation at high search depths
• Use history based move ordering of noncaptures in search
• CECP: Tell user an error if trying to use a POPCNT enabled Octochess on a CPU not supporting that instruction

You can download the new version from http://octochess.org/

Thanks Tim.

[gleperlier]

Playing in Division 3 so

http://www.talkchess.com/forum/viewtopic.php?t=44469

[Werner]

Hi Tim,
hi Jim,
thanks for the updated engine and the compiles.
I now have the problem, which engine we should test:
Octochess r4690 or
Octochess r4692 JA
... what are the differences?

best wishes
Werner

[Jim Ablett]

Hi Tim,
hi Jim,
thanks for the updated engine and the compiles.
I now have the problem, which engine we should test:
Octochess r4690 or
Octochess r4692 JA
... what are the differences?

best wishes
Werner

Here is log of differences between the revisions.

Code: Select all

4692:  Fix problem with not ending a transaction.
4691:  Inside comments there can be [
4690:  Release of r4690

I don't think they affect playing strength.
I would use Tim's builds as it is official release unless you have a legacy system that won't run his versions.
Tim's builds require minimum 64-bit Vista/Win7. My builds will run older systems too such as Win98/WinXP 32 bit.

Jim.

[Werner]

Hi Jim,
thanks for the quick answer - yes, as I use Windows 7 - I can use Tim´s compile. It is a bit faster here on my non SSE4 CPU.

[Codesquid]

Code: Select all

4692:  Fix problem with not ending a transaction.
4691:  Inside comments there can be [
4690:  Release of r4690

I don't think they affect playing strength.

That is correct. Those two changes are in some utility code used by the book generator.

Tim's builds require minimum 64-bit Vista/Win7. My builds will run older systems too such as Win98/WinXP 32 bit.

The 64bit edition of Windows XP is supported as well by my builds, as are the 64bit x86 editions of Windows Server.

[Jim Ablett]

The 64bit edition of Windows XP is supported as well by my builds, as are the 64bit x86 editions of Windows Server.

I think you're incorrect there Tim.
If your Windows builds are compiled with MSVC then they are using 'CONDITION VARIABLES' which are unsupported in WinXP and Server 2003.

I can confirm this as I have Win XP64 and your builds don't run.

Jim.

[Codesquid]

I think you're incorrect there Tim.
If your Windows builds are compiled with MSVC then they are using 'CONDITION VARIABLES' which are unsupported in WinXP and Server 2003.

I can confirm this as I have Win XP64 and your builds don't run.

Mea culpa, thanks for the correction. I didn't realize Windows XP doesn't even have such a basic function.

So indeed, I only support 64bit Windows starting with Vista in my builds.

[Adam Hair]

Sorry for dredging this thread up. I can't run Tim's compile because I use XP 64-bit. And I can not find Jim's compile at his site. Where can I find the latest XP compatible version?