Re-order paragraphs

d) Researchers in the field of artificial intelligence have long been intrigued by games, and not just as a way of avoiding work.

c) Games provide an ideal setting to explore important elements of the design of cleverer machines, such as pattern recognition, learning and planning.

a) Ever since the stunning victory of Deep Blue, a program running on an IBM supercomputer, over Gary Kasparov, then world chess champion, in 1997, it has been clear that computers would dominate that particular game.

b) Today, though, they are pressing the attack on every front.