Gothmog 0.4.6 available

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Gothmog 0.4.6 available

Postby Tord Romstad » 07 Mar 2004, 15:26

Geschrieben von: / Posted by: Tord Romstad at 07 March 2004 15:26:12:

Hello, everybody!
Gothmog 0.4.6 is now available from my site. The new version is not sufficiently well
tested to be sure it is really stronger than 0.4.5 (though I think it is), but it fixes a few
rather serious bugs. Windows and Mac OS X versions are available, the Linux version
will be ready some time tomorrow. The main news are the following:

A bug where Gothmog crashed with an array out of bounds error while trying to
build a PV from the hash table has been fixed. Thanks to Leo Dijksman for helping me
find this bug.

A bug which would occasionally cause a crash when running in "force" mode under
xboard/Winboard is fixed. Thanks to Fabien Letouzey for finding the bug, and suggesting
how to fix it.

A new setting, fritz-hash, is added to the init file. This is intended as a workaround
for the 1MB hash bug in the Fritz GUI. When the GUI instructs the engine to use only 1MB
for hash tables, the engine ignores the request and uses the value of the fritz-hash setting
instead.
Much more aggressive selectivity in the search. As a result, Gothmog searches about
two plies deeper in most middle game positions, but occasionally it also needs a couple
of plies more in order to see a tactical shots. I think the increased selectivity is an improvement,
but I am not yet sure.

Some new endgame knowledge, including a somewhat improved passed pawn
evaluation and a special KRPKR eval.

Fixed a few asymmetry bugs in the evaluation function.

A new and experimental tournament book is included (the tbook.bin file). This is
not supposed to replace the main book file (book.bin, which is a separate download),
the two book files should be used together. By default, the tournament book is disabled.
Until the book has been better tested, I recommend that you leave it disabled in serious
tournament games. If you want to enable the tournament book, modify the "tbook"
setting in the init file.


Tord
Tord Romstad
 

Re: Gothmog 0.4.6 available

Postby Christian Koch » 07 Mar 2004, 16:17

Geschrieben von: / Posted by: Christian Koch at 07 March 2004 16:17:44:
Als Antwort auf: / In reply to: Gothmog 0.4.6 available geschrieben von: / posted by: Tord Romstad at 07 March 2004 15:26:12:

Hello Tord,
thanks a lot :-)
Christian Koch
 

Re: Gothmog 0.4.6 available

Postby Kurt Utzinger » 07 Mar 2004, 20:25

Geschrieben von: / Posted by: Kurt Utzinger at 07 March 2004 20:25:10:
Als Antwort auf: / In reply to: Gothmog 0.4.6 available geschrieben von: / posted by: Tord Romstad at 07 March 2004 15:26:12:
Hello, everybody!
Gothmog 0.4.6 is now available from my site. The new version is not sufficiently well
tested to be sure it is really stronger than 0.4.5 (though I think it is), but it fixes a few
rather serious bugs. Windows and Mac OS X versions are available, the Linux version
will be ready some time tomorrow. The main news are the following:

A bug where Gothmog crashed with an array out of bounds error while trying to
build a PV from the hash table has been fixed. Thanks to Leo Dijksman for helping me
find this bug.

A bug which would occasionally cause a crash when running in "force" mode under
xboard/Winboard is fixed. Thanks to Fabien Letouzey for finding the bug, and suggesting
how to fix it.

A new setting, fritz-hash, is added to the init file. This is intended as a workaround
for the 1MB hash bug in the Fritz GUI. When the GUI instructs the engine to use only 1MB
for hash tables, the engine ignores the request and uses the value of the fritz-hash setting
instead.
Much more aggressive selectivity in the search. As a result, Gothmog searches about
two plies deeper in most middle game positions, but occasionally it also needs a couple
of plies more in order to see a tactical shots. I think the increased selectivity is an improvement,
but I am not yet sure.

Some new endgame knowledge, including a somewhat improved passed pawn
evaluation and a special KRPKR eval.

Fixed a few asymmetry bugs in the evaluation function.

A new and experimental tournament book is included (the tbook.bin file). This is
not supposed to replace the main book file (book.bin, which is a separate download),
the two book files should be used together. By default, the tournament book is disabled.
Until the book has been better tested, I recommend that you leave it disabled in serious
tournament games. If you want to enable the tournament book, modify the "tbook"
setting in the init file.


Tord
5min blitz
RankEngineScoreGoAnS-B1Gothmog 0.4.62.5/5· · · · ·10=01 6.25 1AnMon 5.30 2.5/501=10· · · · · 6.25 
Kurt Utzinger
 


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