Arasan 15.1

[jdart]

Arasan 15.1 is available from http://www.arasanchess.org. This is the same version that played in the recent ACCA online tournament.

Changes in Arasan 15.1:
1) Correctly parse Winboard "level" command that includes a fractional
part in the time increment.
2) Fix bug in result learning code: incorrect learn value when drawing
a high-rated opponent as Black.
3) Fixes to eval for potential passed pawns. Small increase in castling
scores.
4) Changes to "trade down" material scoring.
5) Remove a redundant check for moving a pinned piece when searching
checks in q-search.
6) Fix UCI multipv output when there are fewer legal moves than the
specified multipv count.
7) Change max hash table size for GUI.

In my own testing this version is measurably stronger than 15.0, but not by a lot.

--Jon