Differences between Rybka 2.2 and Rybka 2.1.

The author of the program Vasik Rajlich has managed to increase his program even more significantly and now its leadership among chess playing programs is beyond question.

It is confirmed not only by the rating of independent agency CEGT , but also by the significant victory at Dutch Open Computer Chess Championship 2006 with the result 9 out of 9!

If compared to version 2.1 new version 2.2 has the following advantages:

I.

1) Rybka 2.2 is much better tactically.

2) Rybka 2.2 is much better in longer games.

3) Rybka 2.2 is better in blitz too. While testing the version one organized a blitz match (3' + 1" inc) between Rybka 2.2 and Rybka 2.1o ended with: +111 =206 -55 (+51 Elo).

II.

We don't see technical problems.

The version includes:

•  Rybka 2.2 UCI (for 32 and 64 bit Windows),

•  rybka.dll for easier connecting to Chess Assistant 9

•  an experimental engine Rybka win finder that is a very tactical version of Rybka, often 10x or even 100x faster on tactical problems, but it has evident weak spots. Surely this version is weaker than Rybka 2.2 version but it can be interesting and useful due to the strong tactical function.