Rybka is for the serious chess players. I'm not

There's a free version of this which can be downloaded thru the Internet. It's version 2.2n2. I'm quite sure that you can find version 3 and up in the Philippines.
I like the Chessmaster series because I find it very user friendly. The GUI is also not bad. I also have Fritz and Junior. However, I don't play againts these programs. What I do is to pit it againts each other and see which is stronger. I am more intrigued by the algorithm they use than testing their strength
Some freewares are also not bad. Arasan 10.4 is good as well as Spike and Fruit.