Agony to ecstasy
In forty years, computer chess progressed from the lowest depth to the highest peak of human chess performance. It took a handful of good ideas, culled by trial and error from a larger number of possibilities, an accumulation of previously evaluated game openings and endings, good adjustment of position scores, and especially a ten-millionfold increase in the number of alternative move sequences the machines can explore. Note that chess machines reached world champion performance as their (specialized) processing power reached about 3% of human, on our brain-to-computer scale. Since it is plausible that Garry Kasparov (but hardly anyone else) can apply his brainpower to the problems of chess with an efficiency of 3%, the result supports our retina-based extrapolation. In coming decades, as general-purpose computer power grows beyond Deep Blue's specialized strength, machines will begin to match humans in more common skills.