ACCUMULATION OF SMALL ADVANTAGES. Grandmaster Kasparov beats the computer. The analysis indicates chess computers still don't understand how to play in quiet positions. Look at the commentary after Kasparov's 18 Rb2, which dissuades the program from even thinking about combinations against the pawn on f2. (I have a fun paperback called "Getting the Most from Your Chess Computer" that illustrates a rather lurid mate most cheap computers can be lured into, by the strategic offer of a pawn and some pieces, all while leaving the mate just beyond the chip's horizon until it's too late.) Hat tip: Marginal Revolution, with some thoughts of his own on the strength of chess playing algorithms.