OpenChess

... has been released! 07 October 2011.

http://www.chessok.com/?p=25808

What’s new

(as compared to Aquarium 2011 GUI and Houdini 1.5 engine).

1. Houdini 2.0b chess engine
a. 25 Elo stronger than Houdini 1.5
b. Nalimov tablebases are supported
c. Chess 960 is supported
d. Additional strength with Houdini 2 Pro engine (up to 32 processors, Large pages support, Numa-related speed improvements )
2. IDeA is significantly improved
a. New algorithm and new parameters for specifying tree shape. Now IDeA solves more tasks in automatic mode. With Tactical or Aggressive tree shapes new IDeA could solve in automatic mode even some tactical positions that infinite analysis could not.
b. “Export all projects to Master Tree” is added
c. IDeA engine is optimized and works much faster
3. Inifinite analysis improvements
a. When analysis line is inserted into notation, additional comment is added to the end of the line about where this analysis had place.
b. In infinite analysis history tree you can see not only evaluations of the moves but also depths of analysis
4. Database fixes
a. Limit for size of PGN files is increased up 4 GB instead of 2 GB before
b. Fixed bug with deleting games in PGN file
c. Templates with described header fields can be used for new and existing databases
5. Improved blog export
a. Arrows under board.
b. Arrow keyboard shortcuts work.
6. Improved chess font AqChess.
a. Problems with some symbols not being displayed for some locales are solved.
b. Font parameters were changed for compatibility issues.
7. Many minor changes and fixes

lg

I wonder if Houdini 2 will come to the Fritz GUI as well.

For whatever reason, money is money, and they can always claim that Houdini is the strongest chess engine in existence, which for one reason or another would be true.