Taken from Tord's Winboard Forum post > 
http://www.open-aurec.com/wbforum/viewtopic.php?t=49761


This version is mostly the result of work I did in preparation for the Open Polish 
Computer Chess Championships in June. When I tested the most recent development 
version before the tournament, it performed poorly, and I ended up using version 2.1 
in the tournament. Evidently, I didn't test thoroughly enough, because recent tests 
indicate that the version I prepared for the OPCCC is considerably stronger than 2.1. 

I have therefore fixed a handful of very minor bugs, polished the code a little, and 
published the result as Glaurung 2.2.

The most important improvement is the addition of space evaluation. This improves the 
strength (particularly in Chess960, but also in normal chess), and also makes the style 
of play more attractive.

For the next version, I will have a close look at Marco Costalba's improvements in 
Stockfish 1.1. Stockfish 1.1 seems extremely strong (possibly stronger than Glaurung 2.2), 
and it is surprising that it doesn't get more attention. In the current version of Glaurung, 
there is only one new thing stolen from Stockfish: Razoring has been modified to use only the 
approximate evaluation of the position, rather than the full eval.

Tord