Arasan 11.5

[jdart]

Arasan 11.5 is available from http://www.arasanchess.org.

Changes in Arasan 11.5:
1) King safety scores are tapered off so they don't reach extreme values.
2) Mobility calculation improvements.
3) Changes to razoring logic.
4) Profile Guided Optimization (PGO) build uses deeper search on
fewer positions.

[Graham Banks]

Thanks for your efforts Jon.

[Werner]

Thanks Jon!

Did you work on SMP too?

Best
Werner

[swami]

Thanks Jon for the new update.

Arasan 11.5

Strategic Test Suite Conditions:

Arena GUI
10 seconds per position
500 positions
Core2Quad 32 bits, Q6600, 2 GB RAM, 2.4GHZ
Engine uses 131 Mb Hash. MP.

Subject-wise Scores:

STS (v1.0) - Undermining:
74/100, Grade: A

STS (v2.0) - Open Files and Diagonals:
65/100, Grade: B+

STS (v3.0) - Knight Outposts/Centralization/Repositioning:
63/100, Grade: B

STS (v4.0) - Square Vacancy:
64.28/100, Grade: B

STS (v5.0) - Bishop vs Knight:
69/100, Grade: B+

Overall Performance:

Total Score: 335.28/500

Overall Average: 67.05%

Grade: B+

[jdart]

> Did you work on SMP too?

No, sorry, this version has no significant SMP changes.

--Jon

[CRoberson]

Arasan 11.5 is available from http://www.arasanchess.org.

Changes in Arasan 11.5:

4) Profile Guided Optimization (PGO) build uses deeper search on
fewer positions.

Doesn't make sense to me. PGO is a compiler method that should improve NPS and have zero change to the node counts.

[jdart]

What I meant was, the profile generation step in the build process is using fewer positions / deep search to generate the profiling information. This improves results, I suspect because previously it was not hitting enough depth to really exercise some of the program features like SMP, IID etc.

--Jon