Does anyone know which is stronger, the free Rybka or Fritz 11?

I don't know the numbers, but I would say Rybka. I can sometimes beat Fritz 11 due to it being too "cold-blooded", but Rybka seems a bit more dynamic (thus my only being able to consistenly, but still barely/luckily draw).

I guess I would say Rybka is about 2800 - 3000 ELO, while Fritz trails Rybka by about 50 - 100 points within that range. It all depends on what they're running on, but it probably isn't too noticeable to us mortals.

I ran a quick 5 game Rybka2 vs Fritz11, 5'+0" blitz and the result was +3 =1 -1. I can post better stats another day..... zzzzzzzzzzzzzzzz

From what I've heard Rybka2 is better than Fritz11; it totally depends on the hardware you're using though.

When you get the money  though you should purchase 3.0 if you like 2.3-

it is the right thing to do

Rybka 2.2 (free) is stronger than any other commercial chess engine , including Fritz 11! Stronger than Rybka 2.2 are only newer versions or Rybka (2.3.2a and 3.0).

Check this page out, it's great for comparing strenght of different engines:

http://www.computerchess.org.uk/ccrl/4040/rating_list_all.html

Note that Rybka 2.2 32 bit version is even stronger than 64 bit versions of most other engines.

Also note that Fritz11 is on the 10th place on the list. Fritz is history!

check this link for more info on engine strength

http://www.husvankempen.de/nunn/40_4_Ratinglist/40_4_AllVersion/rangliste.html

I was trying to figure out how to do something like that, how did you do it?

staggerlee

Here's the results of a 40 game match I ran between the free Rybka and Fritz 11 using 1'+1" time controls... Rybka wins decisively.

In this match Rybka was rated at +89 elo compared to Fritz 11

I can tell you how I do it and let me know if it makes sense. I have Fritz 11; I also have the free Rybka engine downloaded from Rybka site. Open Fritz and go to File - New - Engine Match. You then will see a window where you set the parameters of your engine match including which engines, openings books, # of games, max moves, time controls, etc. hit OK and off it goes. Does this make sense? What engine/GUI do you have?