The following is an excerpt from GM Lubomir Kavalek's Column for the Huffington Post:

"Precision, mistake-free play and machine-like calculations were the highest accolades for the top chess players. Remember what the former world champion, Tigran Petrosian, said after he was eliminated by Bobby Fischer from the world championship cycle in 1971? "As soon as Fischer gains even a slightest advantage, he begins playing like a machine. You cannot even hope for some mistake." Nowadays, it seems to be the other way around. "They played like human beings," is the best compliment we can pay to chess computers. When they do play like us, we get emotional: we feel for them, love them and embrace them."

See Here for the sad details.