Twisted Logic 0.087x5 released!!

[Edsel Apostol]

Hi Everyone,

This is another release of my engine. There are bugfixes from the previous version. The most prominent bug is in the king attacks eval and in the piece square table.

I hope that testers would try testing my engine with History Pruning off as I think that it might be stronger on longer time controls, but I am not sure of this. Please test my engine with this feature enabled and disabled. I don't have much testing time and the machine I'm doing my test is antique already so the result of my tests are often inaccurate.

I also included in the release the current engine I am working in. It only has a basic search with just a check extension and no prunings nor reductions whatsoever, and a simple material and piece square tables only. I find it stronger than TSCP on my tests even though the eval is very simple. Weaknesses are king safety and passed pawn evaluation as it has none of this, not even mobility and pawn structure. It supports all basic UCI 1 commands like limiting the number of moves to be searched or a fixed number of nodes to be searched only.

Any feedback is welcome.

I really appreciate the effort of the testers out there like the CCRL, CEGT, Chesswar, WBEC, Le fou numerique, etc. I can't name them all but to those I have forgot to put here, thanks also.

Enjoy testing.

The link to my web is below.

Edsel Apostol

[John van Spijker]

Hello Edsel,

Tried to test your promising 0.087x5 version, but it has "Ponder" bug.
When "Ponder" is on (for example on "Playchess server (F9 GUI)) Twisted Logic will "Hang" when opponent is out of book.
Engine wil not send a move anymore and will calculate till engine is running out of time.

When Ponder is off (you can test this in CB GUI engine - engine functionality) there are no problems.

Your previous version did not have this Ponder bug.

Continue with your great work Edsel, it's all very promising, you achieved great results in short time (Rybka like !) I test a lot with your versions on Playchess server.

Kind regards,

John van Spijker

[Olivier Deville]

Hello Edsel,

Tried to test your promising 0.087x5 version, but it has "Ponder" bug.
When "Ponder" is on (for example on "Playchess server (F9 GUI)) Twisted Logic will "Hang" when opponent is out of book.
Engine wil not send a move anymore and will calculate till engine is running out of time.

When Ponder is off (you can test this in CB GUI engine - engine functionality) there are no problems.

Your previous version did not have this Ponder bug.

Continue with your great work Edsel, it's all very promising, you achieved great results in short time (Rybka like !) I test a lot with your versions on Playchess server.

Kind regards,

John van Spijker

Hi Edsel and John

I can confirm that Twisted stops playing after book moves when pondering is on.

I have disabled pondering for Twisted in ChessWar B.

Olivier