Arasan 10.1

[jdart]

Arasan 10.1 is available from http://www.arasanchess.org.

Changes in Arasan 10.1:
1) Substantially more efficient SMP support, keeps threads more active.
2) Some bug fixes in scoring and checking move generation, thanks to
Keiichiro Tashiro.
3) King safety and endgame scoring changes & fixes.
4) Fixed bug that could cause failure to move when there is a single
legal move from the tablebases.
5) Fix bug that could lead to illegal moves in pv display.
6) Fix long-existing move sorting bug.
7) Use narrower bounds on re-search (Negascout algorithm).
Reduce re-search frequency by setting flag when score is exact.
8) Fix bad search bug involving illegal move detection - in some cases a
valid score was returned after a previous illegal move. One symptom
was problems with stalemate detection.

--Jon