Rybka 4 for free of cost

It can beat houdini.And it is an open source program.You can download it from chessok.Houdini 2 is also there for free.

Rybka 4 is not free.

http://www.chess.com/download/view/rybka-4-w-32

Weird. Rybka 4 is for sale on the Rybka website for $48.75 

http://chessok.com/shop/index.php?main_page=product_info&cPath=7_1&products_id=380

Its the CD version, though. But whey would they sell the CD for nearly $50 and give the d/l version away for free?

Actually, the above link is not to the Rybka site. Here is the Rybka site:

http://www.rybkachess.com/index.php?auswahl=Purchase+Rybka#1

Deep Rybka 4 (for multi core processors) seems to be nearly double the price.

In chessok deep rybka4,Houdini 3 all are free.

It may be just a try out and not the complete version.

It is a complete version.

It is pretty strong and fast.

So I do not think it is a trial version.I never saw that fast engine.

It is a puzzle that on one hand they sell it for around 55 dollars and at the same time they give it free to all.Really it is laughable.