Sorry for my poor English. While I was running a tournament with Cute Chess (under Windows), I let opened the task manager, and I could notice very important difference in the usage that each engine makes of the processor. For example, Glaurung 2.2 sometimes uses more than 90% of the processor power!
I wonder where that difference comes from. For the memory, I can understand that each program allocates a different amount. But for the processor, I don't know how it happens that an engine uses more processor power than another. Where does it come from?
Other question, is it fair play, when an engine uses three times more power than the opponent?
If an engine supports multiple threads, it can use multiple cores of the processor. If you don't give a configuration command to the engine, it will use whatever it thinks should be a good default, and that can well be "use all cores".
