*** Blitz WV 2.1 Version ***

WV2.1 is a recompilation of WV2, that is 15% faster in the opening and early midgame, 
although the speed increase drops to 5% by the late endgame. 
There were a few code changes, but I don't remember what and assume they're unimportant.

WV2 is a version of Slow Chess Blitz WV with a few updated settings & evaluation values, 
but the underlying program is exactly the same. The biggest change is that I made the 
search somewhat more selective by changing some variables.

Results are varied, but tests with a large number of games suggest WV2 to be stronger than WV.
WV2 is actually almost as old as WV. 
(I recompile before releasing so I don't know the exact date it was actually made.)

I haven't done chess programming in many months. There's still hope for a new Slow Chess release, 
but it's not a sure thing. I'll be a bit sad to see it continue to drop on rating lists
as newer and stronger programs are released, but I'm happy with what I accomplished.
I still use Slow Chess to analyze chess games and positions occasionally =)
I hope you enjoy the program. 

*** Blitz WV Version ***

This in a short overview, probably missing lots of changes.
I would consider Slow Blitz WV as a new engine compared to the 2.0-2.96 series, as most of the code relevant to playing style (evaluation & search) has been changed.
It is an experimental version, and an attempt to create something completely different from 2.94/2.96, without caring much about Nodes/Sec or performance against other engines.
As usual, I have no good estimate as to strength against other engines, or humans, but will say WV has performed the best for me.

New in Blitz 0.4: 

	New King Safety, pawn cover calculation completely rewritten
	Many other evaluation changes, like passed pawn (taking King positions & pawn file into account), better bishop scoring, etc
	A few more threats in the search & a few types of checks in the Qsearch. 

New in Blitz WV: 

	Complete Mobility: (bishops & knights & rooks rewritten. no queen mobility yet though.)
	Some square control: not used much though currently, used in knight mobility, and a little bit albeit ineffectively in other mobility and king safety.
	More new King Safety
	Endgame knowledge changes and additions for many different engames, but generally small changes. 
	Endgame bitbases
	More highly selective search
		More aggresive null-move with adaptive R, extended/futility pruning, some Q-search pruning. 
	More threats recognized by the search
		Tactical things, like Mate-in-1 threats, or forks/skewers, seen 1-ply or more earlier thanks to detection, or in the case of mate threats additionally used to extend the search.
		The only special type of move in the Q-search is possible backrow mates, so it's not as tactical as I'd like.
	Much slower nps. Partially due to how nodes are counted, partially it is really slow. (It doesn't need to be quite this slow.)

New to GUI in WV: 

	Analysis window with multivariation analysis possible. 
	Set one of the few predifined personalities in the GUI under Search Options.
	(I hope do user-defined personalities, or well-tuned alternate personalities sometime.)