Texel 1.04

[petero2]

Version 1.04 of my chess engine Texel is now available for download from http://dl.dropboxusercontent.com/u/89684995/texel104.7z

There are 7 compiled versions included:

texel-arm : For the armv7-a architecture. Should work on most modern android devices.
texel32.exe : For 32-bit windows systems with SSE42 and POPCOUNT.
texel32old.exe : For 32-bit windows systems without SSE42 and POPCOUNT.
texel64 : For 64-bit linux intel systems with SSE42 and POPCOUNT.
texel64.exe : For 64-bit windows intel systems with SSE42 and POPCOUNT.
texel64amd.exe : For 64-bit windows systems with SSE42 and POPCOUNT.
texel64old.exe : For 64-bit windows systems without SSE42 and POPCOUNT.

Texel 1.04 is about 70 elo stronger than Texel 1.03 on my linux computer at very fast time controls, using one core. Almost all changes are improvements in the evaluation function.

Changes:
- Added separate queen piece square tables for middle game and endgame.
- Added recognition of some drawn endgames involving bishops and pawns.
- Added evaluation corrections for QvsRR, QvsRM, RvsM, RvsMM.
- Made bishop pair bonus depend on number of opponent minor pieces.
- Added more evaluation terms for pawns (own and opponent) in front of the king.
- Added evaluation terms for king assisting passed pawns.
- Made king endgame piece square table contain 32 parameters.
- Made the isolated and doubled pawn penalties file dependent.
- Added file dependent passed pawn bonus.
- Only use the protected passed pawn bonus when the non-pawn material is balanced.
- Improved knight mobility evaluation.
- Added bonus for a piece blocking an opponent passed pawn.
- Added non-linear king safety and tuned other king safety parameters.
- Improved KRKP evaluation.
- Added evaluation of connected passed pawns.
- Added drawishness factor to rook endgame evaluation, based on white/black pawn asymmetry.
- Added endgame corrections for KRPKM.
- Added square-dependent bonus for pawns protecting/attacking other pawns.
- Added bonus for minor pieces protecting the king.
- Added penalty for semi-backward pawns.
- Reduce evaluation score when the halfmove clock is large.
- Added bonus for rook behind passed pawn.
- Optimized razor margins and delta pruning margin using CLOP.
- Improved the built in opening book.

[Werner]

Thanks a lot, Peter!

best wishes

[Dr.Wael Deeb]

A great release indeed Peter....

Thanks

[Graham Banks]

Version 1.04 of my chess engine Texel is now available for download from http://dl.dropboxusercontent.com/u/89684995/texel104.7z

Thanks Peter. Sounds like pretty good progress!

[fern]

Cannot make Texel work in Arena or Shredder.
Fern

[Ralf Müller]

For me it works perfectly in Arena...

[lucasart]

Texel 1.04 is about 70 elo stronger than Texel 1.03 on my linux computer at very fast time controls, using one core. Almost all changes are improvements in the evaluation function.

That's impressive. So Texel 1.04 should be on par with Hiarcs 14 now.

[fern]

Your luck.
In my case a dialog appeas saying the program cannot work and it will be closed.

[Eelco de Groot]

Fernando just to make sure, did you also try this version?

texel32old.exe : For 32-bit windows systems without SSE42 and POPCOUNT

[lucasart]

Your luck.
In my case a dialog appeas saying the program cannot work and it will be closed.

Works perfectly on linux (64bit sse4.2).

You need to READ the message posted by Peter Osterlund. You will see that there are many compiles and you need to chose the correct one, depending on your OS and CPU.