Arasan 12.3 released

[jdart]

This is the version that played in the recent CCT-13 tournament.

Changes in Arasan 12.3:
1) Changes to move ordering in qsearch - formerly we used to call see()
in the initial move sorting phase but now it is deferred until we
are ready to use a move - this is how most programs do it.
2) Linux version uses an ASM routine (if USE_ASM is defined) for
bit extraction - this is much faster (on CPUs that support it).
3) Small fix to pin detection.
4) Bug fixes in scoring: specifically in adjustMaterialScoreNoPawns,
outpost scoring, potential passer scoring, passer piece block.
5) Reduce penalty for open files around king (was excessive)
6) Qsearch futility prune margin increased back to 1 1/4 pawn. Changes
to LMR reduction depth and thresholds.
7) Endgame capture extension is made in more cases but is decreased to
1/2 ply extra depth
8) Several UCI protocol fixes.

download from http://www.arasanchess.org.

[Graham Banks]

Thanks Jon.

[tmokonen]

You know it's a good day in computer chess land when there's a new Arasan, a new Spike, and a new Pawny.

[Dr.Wael Deeb]

You know it's a good day in computer chess land when there's a new Arasan, a new Spike, and a new Pawny.

+1

[Jamal Bubker]

thanks Jon