Arasan 10.2

[jdart]

Arasan 10.2 is available from http://www.arasanchess.org.

This is not quite the same version that played in CCT10, but close (some additional search enhancements and bug fixes have been made).

Changes in Arasan 10.2:
1) Fix possible crash bug: check for previous illegal move before hash
cutoff.
2) Forced move extension in q-search removed - caused some searches to
blow up (excessive nodes searched).
3) Limited razoring removed - in its place, wider use of LMR. Consolidate
reduction + pruning code. Disable recapture extension by default.
4) Some pawn scoring changes. Fixed asymmetric king center score in endgame.
5) Bug fixes in bad trade scoring.
6) Greater use of R=3 in null move.
7) Linux bug fix: free semaphores on exit.

[Graham Banks]

Thanks Jon.

[gerold]

Thanks Jon,
Best to you,
Gerold.

[geots]

Arasan 10.2 is available from http://www.arasanchess.org.

This is not quite the same version that played in CCT10, but close (some additional search enhancements and bug fixes have been made).

Changes in Arasan 10.2:
1) Fix possible crash bug: check for previous illegal move before hash
cutoff.
2) Forced move extension in q-search removed - caused some searches to
blow up (excessive nodes searched).
3) Limited razoring removed - in its place, wider use of LMR. Consolidate
reduction + pruning code. Disable recapture extension by default.
4) Some pawn scoring changes. Fixed asymmetric king center score in endgame.
5) Bug fixes in bad trade scoring.
6) Greater use of R=3 in null move.
7) Linux bug fix: free semaphores on exit.

Jon, please explain something to me. I am running chessbase, hence i will use the UCI version. I can either download and run the installer or i can download just the book and the engine. I opted for "just the book and the engine". My question is if i was to download and run the installer, what am i missing out on that i need by doing it the other way and just getting the exe and the book? Is the strength going to be any difference one way or the other?

Thanks,

George

[Tony Thomas]

No strength difference George. Installer version comes with Arasan GUI.

[Werner]

Thanks a lot John,
I will start some test games with SMP version today.

I used the uci - version and set using 2 CPUs in the uci options.

As this did not work - I edited the rc file. This is not usual, so I will ask you to put it on your todo list...
regards

[jdart]

Thanks for the observation - Arasan should probably either not support the Threads option or make it work properly - it is a bit hard to dynamically change the thread count in the current implementation.

--Jon

[Werner]

Hi Jon,
I have good results with 2CPU-version till now:
39% against Frenzee 3.0 w32 1CPU (10.1 has had 35%)
53% against Trace 1.37a (10.1 has had 48%)
76% against Quark2.62 (10.1 has had 48%) - interim result.

regards