Myrddin 0.90 Release

[JVMerlino]

I'm pleased to announce yet another relatively minor bump in Myrddin's strength, but enough to warrant a new release.

Myrddin 0.90 plays about 50 elo stronger than previous (so hopefully around 2650 CCRL).

Official site here: http://computer-chess.org/doku.php?id=c ... ddin:index
Github repository with source here: https://github.com/JVMerlino/Myrddin

v0.90 change list:
– Tuned PST files for the first time, and re-tuned all other eval terms
– Captures with negative SEE value can now be reduced
– IID is now more aggressive in its depth reduction and can be applied in PV nodes
– LMR reduction is now one depth less for PV nodes
– No longer limiting the number of extensions for a single branch
– Reduced the number of aspiration windows before performing a full-width search from six to two
– Modified the compiler options for magicmoves to improve perft results by 5%.
– Various minor optimizations
– Added “see” command to return the SEE value of a capture on the current position - example usage “see d4 e5”
– Added “rpt” command to run a brief perft test, using bulk counting and only one thread
– Fixed two bugs in SEE (stopped the calculation if the first capture was of equal value, and failed to include Kings in the calculation)
– Fixed a bug that could cause a save to the hash table even if there was no best move
– Fixed a rare bug such that if a tt probe or IID returned an underpromotion it would not be moved to the front of the movelist
– Fixed an issue when receiving the “force” command while pondering, which can happen with some GUIs
– Removed ”-64” from version string as there is no longer a 32-bit version

Enjoy!
jm

[Graham Banks]

Thanks John.

[bastiball]

I'm pleased to announce yet another relatively minor bump in Myrddin's strength, but enough to warrant a new release.

Myrddin 0.90 plays about 50 elo stronger than previous (so hopefully around 2650 CCRL).

Official site here: http://computer-chess.org/doku.php?id=c ... ddin:index
Github repository with source here: https://github.com/JVMerlino/Myrddin

v0.90 change list:
– Tuned PST files for the first time, and re-tuned all other eval terms
– Captures with negative SEE value can now be reduced
– IID is now more aggressive in its depth reduction and can be applied in PV nodes
– LMR reduction is now one depth less for PV nodes
– No longer limiting the number of extensions for a single branch
– Reduced the number of aspiration windows before performing a full-width search from six to two
– Modified the compiler options for magicmoves to improve perft results by 5%.
– Various minor optimizations
– Added “see” command to return the SEE value of a capture on the current position - example usage “see d4 e5”
– Added “rpt” command to run a brief perft test, using bulk counting and only one thread
– Fixed two bugs in SEE (stopped the calculation if the first capture was of equal value, and failed to include Kings in the calculation)
– Fixed a bug that could cause a save to the hash table even if there was no best move
– Fixed a rare bug such that if a tt probe or IID returned an underpromotion it would not be moved to the front of the movelist
– Fixed an issue when receiving the “force” command while pondering, which can happen with some GUIs
– Removed ”-64” from version string as there is no longer a 32-bit version

Enjoy!
jm

Thanks a lot for the new version!

[Gabor Szots]

Excellent news, John. Gauntlet in progress.

[JVMerlino]

Excellent news, John. Gauntlet in progress.

Thanks, Gabor! Is the gauntlet being broadcast?

[Gabor Szots]

Excellent news, John. Gauntlet in progress.

Thanks, Gabor! Is the gauntlet being broadcast?

No, I'm not prepared for that.

[JVMerlino]

Excellent news, John. Gauntlet in progress.

Thanks, Gabor! Is the gauntlet being broadcast?

No, I'm not prepared for that.

Ok, no worries. I was just excited that it's already happening. Thanks again!

[Gabor Szots]

It's on the blitz list now. Only a couple of games, I intend to play much more in the coming days.

[JVMerlino]

It's on the blitz list now. Only a couple of games, I intend to play much more in the coming days.

Ah, +44 so far. Reasonably close to my expected +50, but we'll see how your other games play out.

Thanks, Gabor!