Kasparov lost the last and deciding game of the match with a horrible blunder playing the Caro-Kann, a defence he did not often play. Kasparov believed that th

Kasparov lost the last and deciding game of the match with a horrible blunder playing the Caro-Kann, a defence he did not often play. Kasparov believed that the Deep Blue team had spent a lot of time analyzing his style and looking for weaknesses. He felt it was unfair that Deep Blue was designed to beat him, personally, but he wasn't able to study it in the same way. Kasparov decided to play an unusual defence in game 6 hoping to avoid any theoretical surprises his opponents may have prepared against his favourite defences, but it didn't work. At the same time, the pressure he was under no doubt contributed to his defeat. Of course now Rybka doesn't need any 'help' from human handlers, it can comfortably beat strong Grandmasters (Rybka 3's ELO is over 3200). If it is any consolation the surge in computer chess strength is largely thought to be due to modern engines evaluating positions more like a human would, rather than looking at more positions.