By the way, I do prefer engines that are playable at arena 3.0
Chess Engine

Something like that: http://www.vanheusden.com/pos/ ?

I solved the problem with Chessmaster 11. It allows you to control both the difficulty and randomness of the computer. Perfect for my needs.

No, I don't want to set a specific opening, I just wanted to add more variety of moves to the engine because it was playing always the same moves, CM11 solved the problem well, it has a "randomness" parameter.
To test a specific opening I am using CM11 and moving back/forward freely pressing ctrl+d/ctrl+i to change sides / edit moves.
And of course on the other side Rybka 4 + arena 3.0 ;D
Hi, can anyone help me?
I'm looking for a chess engine that plays a high variety of different moves. The ones I have play only a few moves, for a particular reason, I need engines that play a wider variety, or I need to be able to edit the ones that I have to do that. I use arena 3.0
Thank you.